--- _id: '15004' abstract: - lang: eng text: The impulsive limit (the “sudden approximation”) has been widely employed to describe the interaction between molecules and short, far-off-resonant laser pulses. This approximation assumes that the timescale of the laser-molecule interaction is significantly shorter than the internal rotational period of the molecule, resulting in the rotational motion being instantaneously “frozen” during the interaction. This simplified description of the laser-molecule interaction is incorporated in various theoretical models predicting rotational dynamics of molecules driven by short laser pulses. In this theoretical work, we develop an effective theory for ultrashort laser pulses by examining the full time-evolution operator and solving the time-dependent Schrödinger equation at the operator level. Our findings reveal a critical angular momentum, lcrit, at which the impulsive limit breaks down. In other words, the validity of the sudden approximation depends not only on the pulse duration but also on its intensity, since the latter determines how many angular momentum states are populated. We explore both ultrashort multicycle (Gaussian) pulses and the somewhat less studied half-cycle pulses, which produce distinct effective potentials. We discuss the limitations of the impulsive limit and propose a method that rescales the effective matrix elements, enabling an improved and more accurate description of laser-molecule interactions. acknowledgement: We thank Bretislav Friedrich, Marjan Mirahmadi, Artem Volosniev, and Burkhard Schmidt for insightful discussions. M.L. acknowledges support by the European Research Council (ERC) under Starting Grant No. 801770 (ANGULON). article_number: '023101' article_processing_charge: No article_type: original author: - first_name: Volker full_name: Karle, Volker id: D7C012AE-D7ED-11E9-95E8-1EC5E5697425 last_name: Karle orcid: 0000-0002-6963-0129 - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: ama: 'Karle V, Lemeshko M. Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular rotational dynamics. Physical Review A. 2024;109(2). doi:10.1103/PhysRevA.109.023101' apa: 'Karle, V., & Lemeshko, M. (2024). Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular rotational dynamics. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.109.023101' chicago: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks: Reevaluating the Impulsive Limit in Molecular Rotational Dynamics.” Physical Review A. American Physical Society, 2024. https://doi.org/10.1103/PhysRevA.109.023101.' ieee: 'V. Karle and M. Lemeshko, “Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular rotational dynamics,” Physical Review A, vol. 109, no. 2. American Physical Society, 2024.' ista: 'Karle V, Lemeshko M. 2024. Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular rotational dynamics. Physical Review A. 109(2), 023101.' mla: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks: Reevaluating the Impulsive Limit in Molecular Rotational Dynamics.” Physical Review A, vol. 109, no. 2, 023101, American Physical Society, 2024, doi:10.1103/PhysRevA.109.023101.' short: V. Karle, M. Lemeshko, Physical Review A 109 (2024). date_created: 2024-02-18T23:01:01Z date_published: 2024-02-01T00:00:00Z date_updated: 2024-02-26T09:45:20Z day: '01' department: - _id: MiLe doi: 10.1103/PhysRevA.109.023101 ec_funded: 1 external_id: arxiv: - '2307.07256' intvolume: ' 109' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2307.07256 month: '02' oa: 1 oa_version: Preprint project: - _id: 2688CF98-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '801770' name: 'Angulon: physics and applications of a new quasiparticle' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular rotational dynamics' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 109 year: '2024' ... --- _id: '15167' abstract: - lang: eng text: We perform a diagrammatic analysis of the energy of a mobile impurity immersed in a strongly interacting two-component Fermi gas to second order in the impurity-bath interaction. These corrections demonstrate divergent behavior in the limit of large impurity momentum. We show the fundamental processes responsible for these logarithmically divergent terms. We study the problem in the general case without any assumptions regarding the fermion-fermion interactions in the bath. We show that the divergent term can be summed up to all orders in the Fermi-Fermi interaction and that the resulting expression is equivalent to the one obtained in the few-body calculation. Finally, we provide a perturbative calculation to the second order in the Fermi-Fermi interaction, and we show the diagrams responsible for these terms. acknowledgement: We thank Félix Werner and Kris Van Houcke for interesting discussions. article_number: '033315' article_processing_charge: No article_type: original author: - first_name: Ragheed full_name: Al Hyder, Ragheed id: d1c405be-ae15-11ed-8510-ccf53278162e last_name: Al Hyder - first_name: F. full_name: Chevy, F. last_name: Chevy - first_name: X. full_name: Leyronas, X. last_name: Leyronas citation: ama: Al Hyder R, Chevy F, Leyronas X. Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy. Physical Review A. 2024;109(3). doi:10.1103/PhysRevA.109.033315 apa: Al Hyder, R., Chevy, F., & Leyronas, X. (2024). Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.109.033315 chicago: Al Hyder, Ragheed, F. Chevy, and X. Leyronas. “Exploring Beyond-Mean-Field Logarithmic Divergences in Fermi-Polaron Energy.” Physical Review A. American Physical Society, 2024. https://doi.org/10.1103/PhysRevA.109.033315. ieee: R. Al Hyder, F. Chevy, and X. Leyronas, “Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy,” Physical Review A, vol. 109, no. 3. American Physical Society, 2024. ista: Al Hyder R, Chevy F, Leyronas X. 2024. Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy. Physical Review A. 109(3), 033315. mla: Al Hyder, Ragheed, et al. “Exploring Beyond-Mean-Field Logarithmic Divergences in Fermi-Polaron Energy.” Physical Review A, vol. 109, no. 3, 033315, American Physical Society, 2024, doi:10.1103/PhysRevA.109.033315. short: R. Al Hyder, F. Chevy, X. Leyronas, Physical Review A 109 (2024). date_created: 2024-03-24T23:00:59Z date_published: 2024-03-19T00:00:00Z date_updated: 2024-03-25T07:36:55Z day: '19' department: - _id: MiLe doi: 10.1103/PhysRevA.109.033315 external_id: arxiv: - '2311.14536' intvolume: ' 109' issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2311.14536 month: '03' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 109 year: '2024' ... --- _id: '12819' abstract: - lang: eng text: 'Reaching a high cavity population with a coherent pump in the strong-coupling regime of a single-atom laser is impossible due to the photon blockade effect. In this Letter, we experimentally demonstrate that in a single-atom maser based on a transmon strongly coupled to two resonators, it is possible to pump over a dozen photons into the system. The first high-quality resonator plays the role of a usual lasing cavity, and the second one presents a controlled dissipation channel, bolstering population inversion, and modifies the energy-level structure to lift the blockade. As confirmation of the lasing action, we observe conventional laser features such as a narrowing of the emission linewidth and external signal amplification. Additionally, we report unique single-atom features: self-quenching and several lasing thresholds.' acknowledgement: We thank N.N. Abramov for assistance with the experimental setup. The sample was fabricated using equipment of MIPT Shared Facilities Center. This research was supported by Russian Science Foundation, grant no. 21-72-30026. article_number: L031701 article_processing_charge: No article_type: letter_note author: - first_name: Alesya full_name: Sokolova, Alesya id: 2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a last_name: Sokolova orcid: 0000-0002-8308-4144 - first_name: D. A. full_name: Kalacheva, D. A. last_name: Kalacheva - first_name: G. P. full_name: Fedorov, G. P. last_name: Fedorov - first_name: O. V. full_name: Astafiev, O. V. last_name: Astafiev citation: ama: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. Physical Review A. 2023;107(3). doi:10.1103/PhysRevA.107.L031701 apa: Sokolova, A., Kalacheva, D. A., Fedorov, G. P., & Astafiev, O. V. (2023). Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.107.L031701 chicago: Sokolova, Alesya, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev. “Overcoming Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability and Strong Coupling.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.L031701. ieee: A. Sokolova, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev, “Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling,” Physical Review A, vol. 107, no. 3. American Physical Society, 2023. ista: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. 2023. Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. Physical Review A. 107(3), L031701. mla: Sokolova, Alesya, et al. “Overcoming Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability and Strong Coupling.” Physical Review A, vol. 107, no. 3, L031701, American Physical Society, 2023, doi:10.1103/PhysRevA.107.L031701. short: A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review A 107 (2023). date_created: 2023-04-09T22:01:00Z date_published: 2023-03-22T00:00:00Z date_updated: 2023-08-01T14:06:05Z day: '22' department: - _id: JoFi doi: 10.1103/PhysRevA.107.L031701 external_id: arxiv: - '2209.05165' isi: - '000957799000006' intvolume: ' 107' isi: 1 issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2209.05165 month: '03' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '12914' abstract: - lang: eng text: We numerically study two methods of measuring tunneling times using a quantum clock. In the conventional method using the Larmor clock, we show that the Larmor tunneling time can be shorter for higher tunneling barriers. In the second method, we study the probability of a spin-flip of a particle when it is transmitted through a potential barrier including a spatially rotating field interacting with its spin. According to the adiabatic theorem, the probability depends on the velocity of the particle inside the barrier. It is numerically observed that the probability increases for higher barriers, which is consistent with the result obtained by the Larmor clock. By comparing outcomes for different initial spin states, we suggest that one of the main causes of the apparent decrease in the tunneling time can be the filtering effect occurring at the end of the barrier. acknowledgement: We thank W. H. Zurek, N. Sinitsyn, M. O. Scully, M. Arndt, and C. H. Marrows for helpful discussions. F.S. acknowledges support from the Los Alamos National Laboratory LDRD program under Project No. 20230049DR and the Center for Nonlinear Studies. F.S. also thanks the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant No. 754411 for support. W.G.U. thanks the Natural Science and Engineering Research Council of Canada, the Hagler Institute of Texas A&M University, the Helmholz Inst HZDR, Germany for support while this work was being done. article_number: '042216' article_processing_charge: No article_type: original author: - first_name: Fumika full_name: Suzuki, Fumika id: 650C99FC-1079-11EA-A3C0-73AE3DDC885E last_name: Suzuki orcid: 0000-0003-4982-5970 - first_name: William G. full_name: Unruh, William G. last_name: Unruh citation: ama: Suzuki F, Unruh WG. Numerical quantum clock simulations for measuring tunneling times. Physical Review A. 2023;107(4). doi:10.1103/PhysRevA.107.042216 apa: Suzuki, F., & Unruh, W. G. (2023). Numerical quantum clock simulations for measuring tunneling times. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.107.042216 chicago: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations for Measuring Tunneling Times.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.042216. ieee: F. Suzuki and W. G. Unruh, “Numerical quantum clock simulations for measuring tunneling times,” Physical Review A, vol. 107, no. 4. American Physical Society, 2023. ista: Suzuki F, Unruh WG. 2023. Numerical quantum clock simulations for measuring tunneling times. Physical Review A. 107(4), 042216. mla: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations for Measuring Tunneling Times.” Physical Review A, vol. 107, no. 4, 042216, American Physical Society, 2023, doi:10.1103/PhysRevA.107.042216. short: F. Suzuki, W.G. Unruh, Physical Review A 107 (2023). date_created: 2023-05-07T22:01:03Z date_published: 2023-04-20T00:00:00Z date_updated: 2023-08-01T14:33:21Z day: '20' department: - _id: MiLe doi: 10.1103/PhysRevA.107.042216 ec_funded: 1 external_id: arxiv: - '2207.13130' isi: - '000975799300006' intvolume: ' 107' isi: 1 issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2207.13130 month: '04' oa: 1 oa_version: Preprint project: - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Numerical quantum clock simulations for measuring tunneling times type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '13233' abstract: - lang: eng text: We study the impact of finite-range physics on the zero-range-model analysis of three-body recombination in ultracold atoms. We find that temperature dependence of the zero-range parameters can vary from one set of measurements to another as it may be driven by the distribution of error bars in the experiment, and not by the underlying three-body physics. To study finite-temperature effects in three-body recombination beyond the zero-range physics, we introduce and examine a finite-range model based upon a hyperspherical formalism. The systematic error discussed in this Letter may provide a significant contribution to the error bars of measured three-body parameters. acknowledgement: We thank Jan Arlt, Hans-Werner Hammer, and Karsten Riisager for useful discussions. M.L. acknowledges support by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). article_number: L061304 article_processing_charge: No article_type: letter_note author: - first_name: Sofya full_name: Agafonova, Sofya id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80 last_name: Agafonova - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 - first_name: Artem full_name: Volosniev, Artem id: 37D278BC-F248-11E8-B48F-1D18A9856A87 last_name: Volosniev orcid: 0000-0003-0393-5525 citation: ama: Agafonova S, Lemeshko M, Volosniev A. Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. 2023;107(6). doi:10.1103/PhysRevA.107.L061304 apa: Agafonova, S., Lemeshko, M., & Volosniev, A. (2023). Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.107.L061304 chicago: Agafonova, Sofya, Mikhail Lemeshko, and Artem Volosniev. “Finite-Range Bias in Fitting Three-Body Loss to the Zero-Range Model.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.L061304. ieee: S. Agafonova, M. Lemeshko, and A. Volosniev, “Finite-range bias in fitting three-body loss to the zero-range model,” Physical Review A, vol. 107, no. 6. American Physical Society, 2023. ista: Agafonova S, Lemeshko M, Volosniev A. 2023. Finite-range bias in fitting three-body loss to the zero-range model. Physical Review A. 107(6), L061304. mla: Agafonova, Sofya, et al. “Finite-Range Bias in Fitting Three-Body Loss to the Zero-Range Model.” Physical Review A, vol. 107, no. 6, L061304, American Physical Society, 2023, doi:10.1103/PhysRevA.107.L061304. short: S. Agafonova, M. Lemeshko, A. Volosniev, Physical Review A 107 (2023). date_created: 2023-07-16T22:01:10Z date_published: 2023-06-20T00:00:00Z date_updated: 2023-08-02T06:31:52Z day: '20' department: - _id: MiLe - _id: OnHo doi: 10.1103/PhysRevA.107.L061304 ec_funded: 1 external_id: arxiv: - '2302.01022' isi: - '001019748000005' intvolume: ' 107' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2302.01022 month: '06' oa: 1 oa_version: Preprint project: - _id: 2688CF98-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '801770' name: 'Angulon: physics and applications of a new quasiparticle' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Finite-range bias in fitting three-body loss to the zero-range model type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '14553' abstract: - lang: eng text: Quantum state tomography is an essential component of modern quantum technology. In application to continuous-variable harmonic-oscillator systems, such as the electromagnetic field, existing tomography methods typically reconstruct the state in discrete bases, and are hence limited to states with relatively low amplitudes and energies. Here, we overcome this limitation by utilizing a feed-forward neural network to obtain the density matrix directly in the continuous position basis. An important benefit of our approach is the ability to choose specific regions in the phase space for detailed reconstruction. This results in a relatively slow scaling of the amount of resources required for the reconstruction with the state amplitude, and hence allows us to dramatically increase the range of amplitudes accessible with our method. article_number: '042430' article_processing_charge: No article_type: original author: - first_name: Ekaterina full_name: Fedotova, Ekaterina id: c1bea5e1-878e-11ee-9dff-d7404e4422ab last_name: Fedotova orcid: 0000-0001-7242-015X - first_name: Nikolai full_name: Kuznetsov, Nikolai last_name: Kuznetsov - first_name: Egor full_name: Tiunov, Egor last_name: Tiunov - first_name: A. E. full_name: Ulanov, A. E. last_name: Ulanov - first_name: A. I. full_name: Lvovsky, A. I. last_name: Lvovsky citation: ama: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. Continuous-variable quantum tomography of high-amplitude states. Physical Review A. 2023;108(4). doi:10.1103/PhysRevA.108.042430 apa: Fedotova, E., Kuznetsov, N., Tiunov, E., Ulanov, A. E., & Lvovsky, A. I. (2023). Continuous-variable quantum tomography of high-amplitude states. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.108.042430 chicago: Fedotova, Ekaterina, Nikolai Kuznetsov, Egor Tiunov, A. E. Ulanov, and A. I. Lvovsky. “Continuous-Variable Quantum Tomography of High-Amplitude States.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.108.042430. ieee: E. Fedotova, N. Kuznetsov, E. Tiunov, A. E. Ulanov, and A. I. Lvovsky, “Continuous-variable quantum tomography of high-amplitude states,” Physical Review A, vol. 108, no. 4. American Physical Society, 2023. ista: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. 2023. Continuous-variable quantum tomography of high-amplitude states. Physical Review A. 108(4), 042430. mla: Fedotova, Ekaterina, et al. “Continuous-Variable Quantum Tomography of High-Amplitude States.” Physical Review A, vol. 108, no. 4, 042430, American Physical Society, 2023, doi:10.1103/PhysRevA.108.042430. short: E. Fedotova, N. Kuznetsov, E. Tiunov, A.E. Ulanov, A.I. Lvovsky, Physical Review A 108 (2023). date_created: 2023-11-19T23:00:54Z date_published: 2023-10-30T00:00:00Z date_updated: 2023-11-20T10:26:51Z day: '30' department: - _id: JoFi doi: 10.1103/PhysRevA.108.042430 external_id: arxiv: - '2212.07406' intvolume: ' 108' issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2212.07406 month: '10' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Continuous-variable quantum tomography of high-amplitude states type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 108 year: '2023' ... --- _id: '13125' abstract: - lang: eng text: 'The quantum approximate optimization algorithm (QAOA) is a variational quantum algorithm, where a quantum computer implements a variational ansatz consisting of p layers of alternating unitary operators and a classical computer is used to optimize the variational parameters. For a random initialization, the optimization typically leads to local minima with poor performance, motivating the search for initialization strategies of QAOA variational parameters. Although numerous heuristic initializations exist, an analytical understanding and performance guarantees for large p remain evasive.We introduce a greedy initialization of QAOA which guarantees improving performance with an increasing number of layers. Our main result is an analytic construction of 2p + 1 transition states—saddle points with a unique negative curvature direction—for QAOA with p + 1 layers that use the local minimum of QAOA with p layers. Transition states connect to new local minima, which are guaranteed to lower the energy compared to the minimum found for p layers. We use the GREEDY procedure to navigate the exponentially increasing with p number of local minima resulting from the recursive application of our analytic construction. The performance of the GREEDY procedure matches available initialization strategies while providing a guarantee for the minimal energy to decrease with an increasing number of layers p. ' acknowledgement: 'We thank V. Verteletskyi for a joint collaboration on numerical studies of the QAOA during his internship at ISTA that inspired analytic results on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript. S.H.S., R.A.M., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the project QuantumReady (FFG 896217). ' article_number: '062404' article_processing_charge: No article_type: original author: - first_name: Stefan full_name: Sack, Stefan id: dd622248-f6e0-11ea-865d-ce382a1c81a5 last_name: Sack orcid: 0000-0001-5400-8508 - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Richard full_name: Kueng, Richard last_name: Kueng - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 2023;107(6). doi:10.1103/physreva.107.062404 apa: Sack, S., Medina Ramos, R. A., Kueng, R., & Serbyn, M. (2023). Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.107.062404 chicago: Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/physreva.107.062404. ieee: S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement,” Physical Review A, vol. 107, no. 6. American Physical Society, 2023. ista: Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 107(6), 062404. mla: Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” Physical Review A, vol. 107, no. 6, 062404, American Physical Society, 2023, doi:10.1103/physreva.107.062404. short: S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023). date_created: 2023-06-07T06:57:32Z date_published: 2023-06-02T00:00:00Z date_updated: 2023-12-13T14:47:25Z day: '02' ddc: - '530' department: - _id: MaSe doi: 10.1103/physreva.107.062404 ec_funded: 1 external_id: arxiv: - '2209.01159' isi: - '001016927100012' file: - access_level: open_access checksum: 0d71423888eeccaa60d8f41197f26306 content_type: application/pdf creator: dernst date_created: 2023-06-13T07:28:36Z date_updated: 2023-06-13T07:28:36Z file_id: '13131' file_name: 2023_PhysRevA_Sack.pdf file_size: 2524611 relation: main_file success: 1 file_date_updated: 2023-06-13T07:28:36Z has_accepted_license: '1' intvolume: ' 107' isi: 1 issue: '6' language: - iso: eng license: https://creativecommons.org/licenses/by/4.0/ month: '06' oa: 1 oa_version: Published Version project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '14622' relation: dissertation_contains status: public scopus_import: '1' status: public title: Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 107 year: '2023' ... --- _id: '11591' abstract: - lang: eng text: We investigate the deterministic generation and distribution of entanglement in large quantum networks by driving distant qubits with the output fields of a nondegenerate parametric amplifier. In this setting, the amplifier produces a continuous Gaussian two-mode squeezed state, which acts as a quantum-correlated reservoir for the qubits and relaxes them into a highly entangled steady state. Here we are interested in the maximal amount of entanglement and the optimal entanglement generation rates that can be achieved with this scheme under realistic conditions taking, in particular, the finite amplifier bandwidth, waveguide losses, and propagation delays into account. By combining exact numerical simulations of the full network with approximate analytic results, we predict the optimal working point for the amplifier and the corresponding qubit-qubit entanglement under various conditions. Our findings show that this passive conversion of Gaussian into discrete-variable entanglement offers a robust and experimentally very attractive approach for operating large optical, microwave, or hybrid quantum networks, for which efficient parametric amplifiers are currently developed. acknowledgement: We thank T. Mavrogordatos and D. Zhu for initial contribution on the presented topic and K. Fedorov for stimulating discussions on entangled microwave beams. This work was supported by the Austrian Science Fund (FWF) through Grant No. P32299 (PHONED) and the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 899354 (SuperQuLAN). Most of the computational results presented were obtained using the CLIP cluster [65]. article_number: '062454' article_processing_charge: No article_type: original author: - first_name: J. full_name: Agustí, J. last_name: Agustí - first_name: Y. full_name: Minoguchi, Y. last_name: Minoguchi - first_name: Johannes M full_name: Fink, Johannes M id: 4B591CBA-F248-11E8-B48F-1D18A9856A87 last_name: Fink orcid: 0000-0001-8112-028X - first_name: P. full_name: Rabl, P. last_name: Rabl citation: ama: Agustí J, Minoguchi Y, Fink JM, Rabl P. Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. 2022;105(6). doi:10.1103/PhysRevA.105.062454 apa: Agustí, J., Minoguchi, Y., Fink, J. M., & Rabl, P. (2022). Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.062454 chicago: Agustí, J., Y. Minoguchi, Johannes M Fink, and P. Rabl. “Long-Distance Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.105.062454. ieee: J. Agustí, Y. Minoguchi, J. M. Fink, and P. Rabl, “Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams,” Physical Review A, vol. 105, no. 6. American Physical Society, 2022. ista: Agustí J, Minoguchi Y, Fink JM, Rabl P. 2022. Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. 105(6), 062454. mla: Agustí, J., et al. “Long-Distance Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.” Physical Review A, vol. 105, no. 6, 062454, American Physical Society, 2022, doi:10.1103/PhysRevA.105.062454. short: J. Agustí, Y. Minoguchi, J.M. Fink, P. Rabl, Physical Review A 105 (2022). date_created: 2022-07-17T22:01:55Z date_published: 2022-06-29T00:00:00Z date_updated: 2023-08-03T11:58:16Z day: '29' department: - _id: JoFi doi: 10.1103/PhysRevA.105.062454 ec_funded: 1 external_id: arxiv: - '2204.02993' isi: - '000824330200003' intvolume: ' 105' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2204.02993' month: '06' oa: 1 oa_version: Preprint project: - _id: 9B868D20-BA93-11EA-9121-9846C619BF3A call_identifier: H2020 grant_number: '899354' name: Quantum Local Area Networks with Superconducting Qubits publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 105 year: '2022' ... --- _id: '11592' abstract: - lang: eng text: 'We compare recent experimental results [Science 375, 528 (2022)] of the superfluid unitary Fermi gas near the critical temperature with a thermodynamic model based on the elementary excitations of the system. We find good agreement between experimental data and our theory for several quantities such as first sound, second sound, and superfluid fraction. We also show that mode mixing between first and second sound occurs. Finally, we characterize the response amplitude to a density perturbation: Close to the critical temperature both first and second sound can be excited through a density perturbation, whereas at lower temperatures only the first sound mode exhibits a significant response.' acknowledgement: The authors gratefully acknowledge stimulating discussions with T. Enss, and thank an anonymous referee for suggestions and remarks that allowed us to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). article_number: '063329' article_processing_charge: No article_type: original author: - first_name: Giacomo full_name: Bighin, Giacomo id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87 last_name: Bighin orcid: 0000-0001-8823-9777 - first_name: Alberto full_name: Cappellaro, Alberto id: 9d13b3cb-30a2-11eb-80dc-f772505e8660 last_name: Cappellaro orcid: 0000-0001-6110-2359 - first_name: L. full_name: Salasnich, L. last_name: Salasnich citation: ama: 'Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. 2022;105(6). doi:10.1103/PhysRevA.105.063329' apa: 'Bighin, G., Cappellaro, A., & Salasnich, L. (2022). Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.063329' chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.105.063329.' ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations,” Physical Review A, vol. 105, no. 6. American Physical Society, 2022.' ista: 'Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations. Physical Review A. 105(6), 063329.' mla: 'Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review A, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:10.1103/PhysRevA.105.063329.' short: G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022). date_created: 2022-07-17T22:01:55Z date_published: 2022-06-30T00:00:00Z date_updated: 2023-08-03T12:00:11Z day: '30' department: - _id: MiLe doi: 10.1103/PhysRevA.105.063329 external_id: arxiv: - '2206.03924' isi: - '000829758500010' intvolume: ' 105' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2206.03924' month: '06' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Unitary Fermi superfluid near the critical temperature: Thermodynamics and sound modes from elementary excitations' type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 105 year: '2022' ... --- _id: '11997' abstract: - lang: eng text: "We study the fate of an impurity in an ultracold heteronuclear Bose mixture, focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description of an impurity in a BEC mixture with contact interactions across its phase diagram. We present results for the miscible and immiscible regimes, as well as for the impurity in a self-bound quantum droplet. Here, varying the interactions, we find exotic states where the impurity localizes either at the center or\r\nat the surface of the droplet. " acknowledgement: We thank A. Simoni for providing the calculations of the intercomponent scattering lengths. We gratefully acknowledge stimulating discussions with L. A. Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading. G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No. M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing Center (NPAD) at UFRN for providing computational resources. article_number: '023301' article_processing_charge: No article_type: original author: - first_name: Giacomo full_name: Bighin, Giacomo id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87 last_name: Bighin orcid: 0000-0001-8823-9777 - first_name: A. full_name: Burchianti, A. last_name: Burchianti - first_name: F. full_name: Minardi, F. last_name: Minardi - first_name: T. full_name: Macrì, T. last_name: Macrì citation: ama: Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component Bose mixture. Physical Review A. 2022;106(2). doi:10.1103/PhysRevA.106.023301 apa: Bighin, G., Burchianti, A., Minardi, F., & Macrì, T. (2022). Impurity in a heteronuclear two-component Bose mixture. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.106.023301 chicago: Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in a Heteronuclear Two-Component Bose Mixture.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.106.023301. ieee: G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear two-component Bose mixture,” Physical Review A, vol. 106, no. 2. American Physical Society, 2022. ista: Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear two-component Bose mixture. Physical Review A. 106(2), 023301. mla: Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.” Physical Review A, vol. 106, no. 2, 023301, American Physical Society, 2022, doi:10.1103/PhysRevA.106.023301. short: G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022). date_created: 2022-08-28T22:02:00Z date_published: 2022-08-04T00:00:00Z date_updated: 2023-08-03T13:20:42Z day: '04' department: - _id: MiLe doi: 10.1103/PhysRevA.106.023301 external_id: arxiv: - '2109.07451' isi: - '000837953600006' intvolume: ' 106' isi: 1 issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2109.07451 month: '08' oa: 1 oa_version: Preprint project: - _id: 26986C82-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: M02641 name: A path-integral approach to composite impurities publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Impurity in a heteronuclear two-component Bose mixture type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 106 year: '2022' ... --- _id: '9242' abstract: - lang: eng text: In the recent years important experimental advances in resonant electro-optic modulators as high-efficiency sources for coherent frequency combs and as devices for quantum information transfer have been realized, where strong optical and microwave mode coupling were achieved. These features suggest electro-optic-based devices as candidates for entangled optical frequency comb sources. In the present work, I study the generation of entangled optical frequency combs in millimeter-sized resonant electro-optic modulators. These devices profit from the experimentally proven advantages such as nearly constant optical free spectral ranges over several gigahertz, and high optical and microwave quality factors. The generation of frequency multiplexed quantum channels with spectral bandwidth in the MHz range for conservative parameter values paves the way towards novel uses in long-distance hybrid quantum networks, quantum key distribution, enhanced optical metrology, and quantum computing. acknowledgement: "I thank Prof. Shabir Barzanjeh and Dr. Ulrich Vogl for the fruitful discussions.\r\n" article_number: '023708' article_processing_charge: No article_type: original author: - first_name: Alfredo R full_name: Rueda Sanchez, Alfredo R id: 3B82B0F8-F248-11E8-B48F-1D18A9856A87 last_name: Rueda Sanchez orcid: 0000-0001-6249-5860 citation: ama: Rueda Sanchez AR. Frequency-multiplexed hybrid optical entangled source based on the Pockels effect. Physical Review A. 2021;103(2). doi:10.1103/PhysRevA.103.023708 apa: Rueda Sanchez, A. R. (2021). Frequency-multiplexed hybrid optical entangled source based on the Pockels effect. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.103.023708 chicago: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled Source Based on the Pockels Effect.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.103.023708. ieee: A. R. Rueda Sanchez, “Frequency-multiplexed hybrid optical entangled source based on the Pockels effect,” Physical Review A, vol. 103, no. 2. American Physical Society, 2021. ista: Rueda Sanchez AR. 2021. Frequency-multiplexed hybrid optical entangled source based on the Pockels effect. Physical Review A. 103(2), 023708. mla: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled Source Based on the Pockels Effect.” Physical Review A, vol. 103, no. 2, 023708, American Physical Society, 2021, doi:10.1103/PhysRevA.103.023708. short: A.R. Rueda Sanchez, Physical Review A 103 (2021). date_created: 2021-03-14T23:01:33Z date_published: 2021-02-11T00:00:00Z date_updated: 2023-08-07T14:11:18Z day: '11' department: - _id: JoFi doi: 10.1103/PhysRevA.103.023708 external_id: arxiv: - '2010.05356' isi: - '000617037900013' intvolume: ' 103' isi: 1 issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2010.05356 month: '02' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Frequency-multiplexed hybrid optical entangled source based on the Pockels effect type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 103 year: '2021' ... --- _id: '10545' abstract: - lang: eng text: Classical models with complex energy landscapes represent a perspective avenue for the near-term application of quantum simulators. Until now, many theoretical works studied the performance of quantum algorithms for models with a unique ground state. However, when the classical problem is in a so-called clustering phase, the ground state manifold is highly degenerate. As an example, we consider a 3-XORSAT model defined on simple hypergraphs. The degeneracy of classical ground state manifold translates into the emergence of an extensive number of Z2 symmetries, which remain intact even in the presence of a quantum transverse magnetic field. We establish a general duality approach that restricts the quantum problem to a given sector of conserved Z2 charges and use it to study how the outcome of the quantum adiabatic algorithm depends on the hypergraph geometry. We show that the tree hypergraph which corresponds to a classically solvable instance of the 3-XORSAT problem features a constant gap, whereas the closed hypergraph encounters a second-order phase transition with a gap vanishing as a power-law in the problem size. The duality developed in this work provides a practical tool for studies of quantum models with classically degenerate energy manifold and reveals potential connections between glasses and gauge theories. acknowledgement: We would like to thank S. De Nicola, A. Michaidilis, T. Gulden, Y. Nez-Fernndez, P. Brighi, and S. Sack for fruitful discussions and valuable feedback on the manuscript. M.S. acknowledges useful discussions with E. Altman, L. Cugliandolo, and C. Laumann. We acknowledge support from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899. article_number: '062423' article_processing_charge: No article_type: original author: - first_name: Raimel A full_name: Medina Ramos, Raimel A id: CE680B90-D85A-11E9-B684-C920E6697425 last_name: Medina Ramos orcid: 0000-0002-5383-2869 - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Medina Ramos RA, Serbyn M. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 2021;104(6). doi:10.1103/physreva.104.062423 apa: Medina Ramos, R. A., & Serbyn, M. (2021). Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.104.062423 chicago: Medina Ramos, Raimel A, and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/physreva.104.062423. ieee: R. A. Medina Ramos and M. Serbyn, “Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT),” Physical Review A, vol. 104, no. 6. American Physical Society, 2021. ista: Medina Ramos RA, Serbyn M. 2021. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 104(6), 062423. mla: Medina Ramos, Raimel A., and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical Review A, vol. 104, no. 6, 062423, American Physical Society, 2021, doi:10.1103/physreva.104.062423. short: R.A. Medina Ramos, M. Serbyn, Physical Review A 104 (2021). date_created: 2021-12-14T20:46:07Z date_published: 2021-12-14T00:00:00Z date_updated: 2023-08-17T06:22:49Z day: '14' department: - _id: MaSe doi: 10.1103/physreva.104.062423 ec_funded: 1 external_id: arxiv: - '2106.06344' isi: - '000753659200004' intvolume: ' 104' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2106.06344 month: '12' oa: 1 oa_version: Preprint project: - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 104 year: '2021' ... --- _id: '10631' abstract: - lang: eng text: We combine experimental and theoretical approaches to explore excited rotational states of molecules embedded in helium nanodroplets using CS2 and I2 as examples. Laser-induced nonadiabatic molecular alignment is employed to measure spectral lines for rotational states extending beyond those initially populated at the 0.37 K droplet temperature. We construct a simple quantum-mechanical model, based on a linear rotor coupled to a single-mode bosonic bath, to determine the rotational energy structure in its entirety. The calculated and measured spectral lines are in good agreement. We show that the effect of the surrounding superfluid on molecular rotation can be rationalized by a single quantity, the angular momentum, transferred from the molecule to the droplet. acknowledgement: I.C. acknowledges the support by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 665385. G.B. acknowledges support from the Austrian Science Fund (FWF), under project No. M2461-N27. M.L. acknowledges support by the Austrian Science Fund (FWF), under project No. P29902-N27, and by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). H.S acknowledges support from the European Research Council-AdG (Project No. 320459, DropletControl) and from The Villum Foundation through a Villum Investigator grant no. 25886. article_number: L061303 article_processing_charge: No article_type: original author: - first_name: Igor full_name: Cherepanov, Igor id: 339C7E5A-F248-11E8-B48F-1D18A9856A87 last_name: Cherepanov - first_name: Giacomo full_name: Bighin, Giacomo id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87 last_name: Bighin orcid: 0000-0001-8823-9777 - first_name: Constant A. full_name: Schouder, Constant A. last_name: Schouder - first_name: Adam S. full_name: Chatterley, Adam S. last_name: Chatterley - first_name: Simon H. full_name: Albrechtsen, Simon H. last_name: Albrechtsen - first_name: Alberto Viñas full_name: Muñoz, Alberto Viñas last_name: Muñoz - first_name: Lars full_name: Christiansen, Lars last_name: Christiansen - first_name: Henrik full_name: Stapelfeldt, Henrik last_name: Stapelfeldt - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: ama: Cherepanov I, Bighin G, Schouder CA, et al. Excited rotational states of molecules in a superfluid. Physical Review A. 2021;104(6). doi:10.1103/PhysRevA.104.L061303 apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Albrechtsen, S. H., Muñoz, A. V., … Lemeshko, M. (2021). Excited rotational states of molecules in a superfluid. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.104.L061303 chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley, Simon H. Albrechtsen, Alberto Viñas Muñoz, Lars Christiansen, Henrik Stapelfeldt, and Mikhail Lemeshko. “Excited Rotational States of Molecules in a Superfluid.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.104.L061303. ieee: I. Cherepanov et al., “Excited rotational states of molecules in a superfluid,” Physical Review A, vol. 104, no. 6. American Physical Society, 2021. ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Albrechtsen SH, Muñoz AV, Christiansen L, Stapelfeldt H, Lemeshko M. 2021. Excited rotational states of molecules in a superfluid. Physical Review A. 104(6), L061303. mla: Cherepanov, Igor, et al. “Excited Rotational States of Molecules in a Superfluid.” Physical Review A, vol. 104, no. 6, L061303, American Physical Society, 2021, doi:10.1103/PhysRevA.104.L061303. short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, S.H. Albrechtsen, A.V. Muñoz, L. Christiansen, H. Stapelfeldt, M. Lemeshko, Physical Review A 104 (2021). date_created: 2022-01-16T23:01:29Z date_published: 2021-12-30T00:00:00Z date_updated: 2023-08-17T06:52:17Z day: '30' department: - _id: MiLe doi: 10.1103/PhysRevA.104.L061303 ec_funded: 1 external_id: arxiv: - '2107.00468' isi: - '000739618300001' intvolume: ' 104' isi: 1 issue: '6' language: - iso: eng main_file_link: - open_access: '1' url: http://128.84.4.18/abs/2107.00468 month: '12' oa: 1 oa_version: Preprint project: - _id: 26031614-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P29902 name: Quantum rotations in the presence of a many-body environment - _id: 2688CF98-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '801770' name: 'Angulon: physics and applications of a new quasiparticle' - _id: 2564DBCA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '665385' name: International IST Doctoral Program - _id: 26986C82-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: M02641 name: A path-integral approach to composite impurities publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Excited rotational states of molecules in a superfluid type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 104 year: '2021' ... --- _id: '13997' abstract: - lang: eng text: We investigate theoretically the strong-field regime of light-matter interactions in the topological-insulator class of quantum materials. In particular, we focus on the process of nonperturbative high-order harmonic generation from the paradigmatic three-dimensional topological insulator bismuth selenide (Bi2Se3) subjected to intense midinfrared laser fields. We analyze the contributions from the spin-orbit-coupled bulk states and the topological surface bands separately and reveal a major difference in how their harmonic yields depend on the ellipticity of the laser field. Bulk harmonics show a monotonic decrease in their yield as the ellipticity increases, in a manner reminiscent of high harmonic generation in gaseous media. However, the surface contribution exhibits a highly nontrivial dependence, culminating with a maximum for circularly polarized fields. We attribute the observed anomalous behavior to (i) the enhanced amplitude and the circular pattern of the interband dipole and the Berry connections in the vicinity of the Dirac point and (ii) the influence of the higher-order, hexagonal warping terms in the Hamiltonian, which are responsible for the hexagonal deformation of the energy surface at higher momenta. The latter are associated directly with spin-orbit-coupling parameters. Our results thus establish the sensitivity of strong-field-driven high harmonic emission to the topology of the band structure as well as to the manifestations of spin-orbit interaction. article_number: '023101' article_processing_charge: No article_type: original author: - first_name: Denitsa Rangelova full_name: Baykusheva, Denitsa Rangelova id: 71b4d059-2a03-11ee-914d-dfa3beed6530 last_name: Baykusheva - first_name: Alexis full_name: Chacón, Alexis last_name: Chacón - first_name: Dasol full_name: Kim, Dasol last_name: Kim - first_name: Dong Eon full_name: Kim, Dong Eon last_name: Kim - first_name: David A. full_name: Reis, David A. last_name: Reis - first_name: Shambhu full_name: Ghimire, Shambhu last_name: Ghimire citation: ama: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. Strong-field physics in three-dimensional topological insulators. Physical Review A. 2021;103(2). doi:10.1103/physreva.103.023101 apa: Baykusheva, D. R., Chacón, A., Kim, D., Kim, D. E., Reis, D. A., & Ghimire, S. (2021). Strong-field physics in three-dimensional topological insulators. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.103.023101 chicago: Baykusheva, Denitsa Rangelova, Alexis Chacón, Dasol Kim, Dong Eon Kim, David A. Reis, and Shambhu Ghimire. “Strong-Field Physics in Three-Dimensional Topological Insulators.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/physreva.103.023101. ieee: D. R. Baykusheva, A. Chacón, D. Kim, D. E. Kim, D. A. Reis, and S. Ghimire, “Strong-field physics in three-dimensional topological insulators,” Physical Review A, vol. 103, no. 2. American Physical Society, 2021. ista: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. 2021. Strong-field physics in three-dimensional topological insulators. Physical Review A. 103(2), 023101. mla: Baykusheva, Denitsa Rangelova, et al. “Strong-Field Physics in Three-Dimensional Topological Insulators.” Physical Review A, vol. 103, no. 2, 023101, American Physical Society, 2021, doi:10.1103/physreva.103.023101. short: D.R. Baykusheva, A. Chacón, D. Kim, D.E. Kim, D.A. Reis, S. Ghimire, Physical Review A 103 (2021). date_created: 2023-08-09T13:09:26Z date_published: 2021-02-01T00:00:00Z date_updated: 2023-08-22T07:33:43Z day: '01' doi: 10.1103/physreva.103.023101 extern: '1' external_id: arxiv: - '2008.01265' intvolume: ' 103' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2008.01265 month: '02' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Strong-field physics in three-dimensional topological insulators type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 103 year: '2021' ... --- _id: '14009' abstract: - lang: eng text: Attosecond delays between photoelectron wave packets emitted from different electronic shells are now well established. Is there any delay between electrons originating from the same electronic shell but leaving the cation in different fine-structure states? This question is relevant for all attosecond photoemission studies involving heavy elements, be it atoms, molecules or solids. We answer this fundamental question by measuring energy-dependent delays between photoelectron wave packets associated with the 2P3/2 and 2P1/2 components of the electronic groundstates of Xe+ and Kr+. We observe delays reaching up to 33±6 as in the case of Xe. Our results are compared with two state-of-the-art theories. Whereas both theories quantitatively agree with the results obtained for Kr, neither of them fully reproduces the experimental results in Xe. Performing delay measurements very close to the ionization thresholds, we compare the agreement of several analytical formulas for the continuum-continuum delays with experimental data. Our results show an important influence of spin-orbit coupling on attosecond photoionization delays, highlight the requirement for additional theory development, and offer a precision benchmark for such work. article_number: '013404' article_processing_charge: No article_type: original author: - first_name: I. full_name: Jordan, I. last_name: Jordan - first_name: M. full_name: Huppert, M. last_name: Huppert - first_name: S. full_name: Pabst, S. last_name: Pabst - first_name: A. S. full_name: Kheifets, A. S. last_name: Kheifets - first_name: Denitsa Rangelova full_name: Baykusheva, Denitsa Rangelova id: 71b4d059-2a03-11ee-914d-dfa3beed6530 last_name: Baykusheva - first_name: H. J. full_name: Wörner, H. J. last_name: Wörner citation: ama: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. Spin-orbit delays in photoemission. Physical Review A. 2017;95(1). doi:10.1103/physreva.95.013404 apa: Jordan, I., Huppert, M., Pabst, S., Kheifets, A. S., Baykusheva, D. R., & Wörner, H. J. (2017). Spin-orbit delays in photoemission. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.95.013404 chicago: Jordan, I., M. Huppert, S. Pabst, A. S. Kheifets, Denitsa Rangelova Baykusheva, and H. J. Wörner. “Spin-Orbit Delays in Photoemission.” Physical Review A. American Physical Society, 2017. https://doi.org/10.1103/physreva.95.013404. ieee: I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. R. Baykusheva, and H. J. Wörner, “Spin-orbit delays in photoemission,” Physical Review A, vol. 95, no. 1. American Physical Society, 2017. ista: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. 2017. Spin-orbit delays in photoemission. Physical Review A. 95(1), 013404. mla: Jordan, I., et al. “Spin-Orbit Delays in Photoemission.” Physical Review A, vol. 95, no. 1, 013404, American Physical Society, 2017, doi:10.1103/physreva.95.013404. short: I. Jordan, M. Huppert, S. Pabst, A.S. Kheifets, D.R. Baykusheva, H.J. Wörner, Physical Review A 95 (2017). date_created: 2023-08-10T06:36:58Z date_published: 2017-01-10T00:00:00Z date_updated: 2023-08-22T08:38:17Z day: '10' doi: 10.1103/physreva.95.013404 extern: '1' intvolume: ' 95' issue: '1' language: - iso: eng month: '01' oa_version: None publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Spin-orbit delays in photoemission type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 95 year: '2017' ...