@article{20840,
abstract = {Probing the possibility of entanglement generation through gravity offers a path to tackle the question of whether gravitational fields possess a quantum mechanical nature. A potential realization necessitates systems with low-frequency dynamics at an optimal mass scale, for which the microgram-to-milligram range is a strong contender. Here, after refining a figure-of-merit for the problem, we present a 1-milligram torsional pendulum operating at 18 Hz. We demonstrate laser cooling its motion from room temperature to 240 microkelvins, surpassing by over 20-fold the coldest motions attained for oscillators ranging from micrograms to kilograms. We quantify and contrast the utility of the current approach with other platforms. The achieved performance and large improvement potential highlight milligram-scale torsional pendulums as a powerful platform for precision measurements relevant to future studies at the quantum-gravity interface.},
author = {Agafonova, Sofya and Rosello, Pere and Mekonnen, Manuel and Hosten, Onur},
issn = {2399-3650},
journal = {Communications Physics},
publisher = {Springer Nature},
title = {{One-milligram torsional pendulum toward experiments at the quantum-gravity interface}},
doi = {10.1038/s42005-026-02514-w},
volume = {9},
year = {2026},
}
@article{19636,
abstract = {This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024 (Second Terrestrial Very-Long-Baseline Atom Interferometry Workshop, Imperial College, April 2024), building on the initial discussions during the inaugural workshop held at CERN in March 2023 (First Terrestrial Very-Long-Baseline Atom Interferometry Workshop, CERN, March 2023). Like the summary of the first workshop (Abend et al. in AVS Quantum Sci. 6:024701, 2024), this document records a critical milestone for the international atom interferometry community. It documents our concerted efforts to evaluate progress, address emerging challenges, and refine strategic directions for future large-scale atom interferometry projects. Our commitment to collaboration is manifested by the integration of diverse expertise and the coordination of international resources, all aimed at advancing the frontiers of atom interferometry physics and technology, as set out in a Memorandum of Understanding signed by over 50 institutions (Memorandum of Understanding for the Terrestrial Very Long Baseline Atom Interferometer Study).},
author = {Abdalla, Adam and Abe, Mahiro and Abend, Sven and Abidi, Mouine and Aidelsburger, Monika and Alibabaei, Ashkan and Allard, Baptiste and Antoniadis, John and Arduini, Gianluigi and Augst, Nadja and Balamatsias, Philippos and Balaž, Antun and Banks, Hannah and Barcklay, Rachel L. and Barone, Michele and Barsanti, Michele and Bason, Mark G. and Bassi, Angelo and Bayle, Jean Baptiste and Baynham, Charles F.A. and Beaufils, Quentin and Beldjoudi, Sélyan and Belić, Aleksandar and Bennetts, Shayne and Bernabeu, Jose and Bertoldi, Andrea and Bigard, Clara and Bigelow, N. P. and Bingham, Robert and Blas, Diego and Bobrick, Alexey and Boehringer, Samuel and Bogojević, Aleksandar and Bongs, Kai and Bortoletto, Daniela and Bouyer, Philippe and Brand, Christian and Buchmueller, Oliver and Buica, Gabriela and Calatroni, Sergio and Calmels, Léo and Canizares, Priscilla and Canuel, Benjamin and Caramete, Ana and Caramete, Laurentiu Ioan and Carlesso, Matteo and Carlton, John and Carman, Samuel P. and Carroll, Andrew and Casariego, Mateo and Chairetis, Minoas and Charmandaris, Vassilis and Chauhan, Upasna and Chen, Jiajun and Chiofalo, Maria Luisa Maria Luisa Marilù and Ciampini, Donatella and Cimbri, Alessia and Cladé, Pierre and Coleman, Jonathon and Constantin, Florin Lucian and Contaldi, Carlo R. and Corgier, Robin and Dash, Bineet and Davies, G. J. and De Rham, Claudia and De Roeck, Albert and Derr, Daniel and Dey, Soumyodeep and Di Pumpo, Fabio and Djordjevic, Goran S. and Döbrich, Babette and Dornan, Peter and Doser, Michael and Drougakis, Giannis and Dunningham, Jacob and Duspayev, Alisher and Easo, Sajan and Eby, Joshua and Efremov, Maxim and Elertas, Gedminas and Ellis, John and Entin, Nicholas and Fairhurst, Stephen and Fanì, Mattia and Fassi, Farida and Fayet, Pierre and Felea, Daniel and Feng, Jie and Flack, Robert and Foot, Chris and Freegarde, Tim and Fuchs, Elina and Gaaloul, Naceur and Gao, Dongfeng and Gardner, Susan and Garraway, Barry M. and Garrido Alzar, Carlos L. and Gauguet, Alexandre and Giese, Enno and Gill, Patrick and Giudice, Gian F. and Glasbrenner, Eric P. and Glick, Jonah and Graham, Peter W. and Granados, Eduardo and Griffin, Paul F. and Gué, Jordan and Guellati-Khelifa, Saïda and Gupta, Subhadeep and Gupta, Vishu and Hackermueller, Lucia and Haehnelt, Martin and Hakulinen, Timo and Hammerer, Klemens and Hanımeli, Ekim T. and Harte, Tiffany and Hartmann, Sabrina and Hawkins, Leonie and Hees, Aurelien and Herbst, Alexander and Hird, Thomas M. and Hobson, Richard and Hogan, Jason and Holst, Bodil and Holynski, Michael and Hosten, Onur and Hsu, Chung Chuan and Huang, Wayne Cheng Wei and Hughes, Kenneth M. and Hussain, Kamran and Hütsi, Gert and Iovino, Antonio and Isfan, Maria Catalina and Janson, Gregor and Jeglič, Peter and Jetzer, Philippe and Jiang, Yijun and Juzeliūnas, Gediminas and Kaenders, Wilhelm and Kalliokoski, Matti and Kehagias, Alex and Kilian, Eva and Klempt, Carsten and Knight, Peter and Koley, Soumen and Konrad, Bernd and Kovachy, Tim and Krutzik, Markus and Kumar, Mukesh and Kumar, Pradeep and Labiad, Hamza and Lan, Shau Yu and Landragin, Arnaud and Landsberg, Greg and Langlois, Mehdi and Lanigan, Bryony and Leone, Bruno and Le Poncin-Lafitte, Christophe and Lellouch, Samuel and Lewicki, Marek and Lien, Yu Hung and Lombriser, Lucas and Asamar, Elias Lopez and Lopez-Gonzalez, J. Luis and Lu, Chen and Luciano, Giuseppe Gaetano and Lundblad, Nathan and De J. López Monjaraz, Cristian and Lowe, Adam and Mackoit-Sinkevičienė, Mažena and Maggiore, Michele and Majumdar, Anirban and Makris, Konstantinos and Maleknejad, Azadeh and Marchant, Anna L. and Mariotti, Agnese and Markou, Christos and Matthews, Barnaby and Mazumdar, Anupam and Mccabe, Christopher and Meister, Matthias and Mentasti, Giorgio and Menu, Jonathan and Messineo, Giuseppe and Meyer-Hoppe, Bernd and Micalizio, Salvatore and Migliaccio, Federica and Millington, Peter and Milosevic, Milan and Mishra, Abhay and Mitchell, Jeremiah and Morley, Gavin W. and Mouelle, Noam and Müller, Jürgen and Newbold, David and Ni, Wei Tou and Niehof, Christian and Noller, Johannes and Odžak, Senad and Oi, Daniel K.L. and Oikonomou, Andreas and Omar, Yasser and Overstreet, Chris and Puthiya Veettil, Vishnupriya and Pahl, Julia and Paling, Sean and Pan, Zhongyin and Pappas, George and Pareek, Vinay and Pasatembou, Elizabeth and Paternostro, Mauro and Pathak, Vishal K. and Pelucchi, Emanuele and Pereira Dos Santos, Franck and Peters, Achim and Pichery, Annie and Pikovski, Igor and Pilaftsis, Apostolos and Pislan, Florentina Crenguta and Plunkett, Robert and Poggiani, Rosa and Prevedelli, Marco and Rafelski, Johann and Raidal, Juhan and Raidal, Martti and Rasel, Ernst Maria and Renaux-Petel, Sébastien and Richaud, Andrea and Rivero-Antunez, Pedro and Rodzinka, Tangui and Roura, Albert and Rudolph, Jan and Sabulsky, Dylan and Safronova, Marianna S. and Sakellariadou, Mairi and Salvi, Leonardo and Sameed, Muhammed and Sarkar, Sumit and Schach, Patrik and Schäffer, Stefan Alaric and Schelfhout, Jesse and Schilling, Manuel and Schkolnik, Vladimir and Schleich, Wolfgang P. and Schlippert, Dennis and Schneider, Ulrich and Schreck, Florian and Schwartzman, Ariel and Schwersenz, Nico and Sergijenko, Olga and Sfar, Haifa Rejeb and Shao, Lijing and Shipsey, Ian and Shu, Jing and Singh, Yeshpal and Sopuerta, Carlos F. and Sorba, Marianna and Sorrentino, Fiodor and Spallicci, Alessandro D.A.M. and Stefanescu, Petruta and Stergioulas, Nikolaos and Stoerk, Daniel and Thaivalappil Sunilkumar, Hrudya and Ströhle, Jannik and Tam, Zoie and Tandon, Dhruv and Tang, Yijun and Tell, Dorothee and Tempere, Jacques and Temples, Dylan J. and Thampy, Rohit P. and Tietje, Ingmari C. and Tino, Guglielmo M. and Tinsley, Jonathan N. and Tintareanu Mircea, Ovidiu and Tkalčec, Kimberly and Tolley, Andrew J. and Tornatore, Vincenza and Torres-Orjuela, Alejandro and Treutlein, Philipp and Trombettoni, Andrea and Ufrecht, Christian and Urrutia, Juan and Valenzuela, Tristan and Valerio, Linda R. and Van Der Grinten, Maurits and Vaskonen, Ville and Vázquez-Aceves, Verónica and Veermäe, Hardi and Vetrano, Flavio and Vitanov, Nikolay V. and Von Klitzing, Wolf and Wald, Sebastian and Walker, Thomas and Walser, Reinhold and Wang, Jin and Wang, Yan and Weidner, C. A. and Wenzlawski, André and Werner, Michael and Wörner, Lisa and Yahia, Mohamed E. and Yazgan, Efe and Zambrini Cruzeiro, Emmanuel and Zarei, M. and Zhan, Mingsheng and Zhang, Shengnan and Zhou, Lin and Zupanič, Erik},
issn = {2196-0763},
journal = {EPJ Quantum Technology},
publisher = {Springer Nature},
title = {{Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the second workshop}},
doi = {10.1140/epjqt/s40507-025-00344-3},
volume = {12},
year = {2025},
}
@article{14802,
abstract = {Frequency-stable lasers form the back bone of precision measurements in science and technology. Such lasers typically attain their stability through frequency locking to reference cavities. State-of-the-art locking performances to date had been achieved using frequency modulation based methods, complemented with active drift cancellation systems. We demonstrate an all passive, modulation-free laser-cavity locking technique (squash locking) that utilizes changes in spatial beam ellipticity for error signal generation, and a coherent polarization post-selection for noise resilience. By comparing two identically built proof-of-principle systems, we show a frequency locking instability of 5×10−7 relative to the cavity linewidth at 10 s averaging. The results surpass the demonstrated performances of methods engineered over the last five decades, potentially enabling an advancement in the precision control of lasers, while creating avenues for bridging the performance gaps between industrial grade lasers with scientific ones due to the afforded simplicity and scalability.},
author = {Diorico, Fritz R and Zhutov, Artem and Hosten, Onur},
issn = {2334-2536},
journal = {Optica},
keywords = {Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials},
number = {1},
pages = {26--31},
publisher = {Optica Publishing Group},
title = {{Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth}},
doi = {10.1364/optica.507451},
volume = {11},
year = {2024},
}
@article{14980,
abstract = {Precision sensing and manipulation of milligram-scale mechanical oscillators has attracted growing interest in the fields of table-top explorations of gravity and tests of quantum mechanics at macroscopic scales. Torsional oscillators present an opportunity in this regard due to their remarked isolation from environmental noise. For torsional motion, an effective employment of optical cavities to enhance optomechanical interactions—as already established for linear oscillators—so far faced certain challenges. Here, we propose a concept for sensing and manipulating torsional motion, where exclusively the torsional rotations of a pendulum are mapped onto the path length of a single two-mirror optical cavity. The concept inherently alleviates many limitations of previous approaches. A proof-of-principle experiment is conducted with a rigidly controlled pendulum to explore the sensing aspects of the concept and to identify practical limitations in a potential state-of-the art setup. Based on this study, we anticipate development of precision torque sensors utilizing torsional pendulums that can support sensitivities below 10−19Nm/√Hz, while the motion of the pendulums are dominated by quantum radiation pressure noise at sub-microwatts of incoming laser power. These developments will provide horizons for experiments at the interface of quantum mechanics and gravity.},
author = {Agafonova, Sofya and Mishra, Umang and Diorico, Fritz R and Hosten, Onur},
issn = {2643-1564},
journal = {Physical Review Research},
number = {1},
publisher = {American Physical Society},
title = {{Zigzag optical cavity for sensing and controlling torsional motion}},
doi = {10.1103/physrevresearch.6.013141},
volume = {6},
year = {2024},
}
@article{14749,
abstract = {We unveil a powerful method for the stabilization of laser injection locking based on sensing variations in the output beam ellipticity of an optically seeded laser. The effect arises due to an interference between the seeding beam and the injected laser output. We demonstrate the method for a commercial semiconductor laser without the need for any internal changes to the readily operational injection locked laser system that was used. The method can also be used to increase the mode-hop free tuning range of lasers, and has the potential to fill a void in the low-noise laser industry.},
author = {Mishra, Umang and Li, Vyacheslav and Wald, Sebastian and Agafonova, Sofya and Diorico, Fritz R and Hosten, Onur},
issn = {1539-4794},
journal = {Optics Letters},
keywords = {Atomic and Molecular Physics, and Optics},
number = {15},
pages = {3973--3976},
publisher = {Optica Publishing Group},
title = {{Monitoring and active stabilization of laser injection locking using beam ellipticity}},
doi = {10.1364/ol.495553},
volume = {48},
year = {2023},
}
@article{14759,
abstract = {Proper operation of electro-optic I/Q modulators relies on precise adjustment and control of the relative phase biases between the modulator’s internal interferometer arms. We present an all-analog phase bias locking scheme where error signals are obtained from the beat between the optical carrier and optical tones generated by an auxiliary 2 MHz 𝑅𝐹 tone to lock the phases of all three involved interferometers for operation up to 10 GHz. With the developed method, we demonstrate an I/Q modulator in carrier-suppressed single-sideband mode, where the suppressed carrier and sideband are locked at optical power levels <−27dB
relative to the transmitted sideband. We describe a simple analytical model for calculating the error signals and detail the implementation of the electronic circuitry for the implementation of the method.},
author = {Wald, Sebastian and Diorico, Fritz R and Hosten, Onur},
issn = {2155-3165},
journal = {Applied Optics},
keywords = {Atomic and Molecular Physics, and Optics, Engineering (miscellaneous), Electrical and Electronic Engineering},
number = {1},
pages = {1--7},
publisher = {Optica Publishing Group},
title = {{Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone}},
doi = {10.1364/ao.474118},
volume = {62},
year = {2023},
}
@article{10652,
abstract = {Finding a feasible scheme for testing the quantum mechanical nature of the gravitational interaction has been attracting an increasing level of attention. Gravity mediated entanglement generation so far appears to be the key ingredient for a potential experiment. In a recent proposal [D. Carney et al., PRX Quantum 2, 030330 (2021)] combining an atom interferometer with a low-frequency mechanical oscillator, a coherence revival test is proposed for verifying this entanglement generation. With measurements performed only on the atoms, this protocol bypasses the need for correlation measurements. Here, we explore formulations of such a protocol, and specifically find that in the envisioned regime of operation with high thermal excitation, semiclassical models, where there is no concept of entanglement, also give the same experimental signatures. We elucidate in a fully quantum mechanical calculation that entanglement is not the source of the revivals in the relevant parameter regime. We argue that, in its current form, the suggested test is only relevant if the oscillator is nearly in a pure quantum state, and in this regime the effects are too small to be measurable. We further discuss potential open ends. The results highlight the importance and subtleties of explicitly considering how the quantum case differs from the classical expectations when testing for the quantum mechanical nature of a physical system.},
author = {Hosten, Onur},
issn = {2643-1564},
journal = {Physical Review Research},
number = {1},
publisher = {American Physical Society},
title = {{Constraints on probing quantum coherence to infer gravitational entanglement}},
doi = {10.1103/PhysRevResearch.4.013023},
volume = {4},
year = {2022},
}
@article{11438,
abstract = {Lasers with well-controlled relative frequencies are indispensable for many applications in science and technology. We present a frequency-offset locking method for lasers based on beat-frequency discrimination utilizing hybrid electronic LC filters. The method is specifically designed for decoupling the tightness of the lock from the broadness of its capture range. The presented demonstration locks two free-running diode lasers at 780 nm with a 5.5-GHz offset. It displays an offset frequency instability below 55 Hz for time scales in excess of 1000 s and a minimum of 12 Hz at 10-s averaging. The performance is complemented with a 190-MHz lock-capture range, a tuning range of up to 1 GHz, and a frequency ramp agility of 200kHz/μs.},
author = {Li, Vyacheslav and Diorico, Fritz R and Hosten, Onur},
issn = {2331-7019},
journal = {Physical Review Applied},
keywords = {General Physics and Astronomy},
number = {5},
publisher = {American Physical Society},
title = {{Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters}},
doi = {10.1103/physrevapplied.17.054031},
volume = {17},
year = {2022},
}
@article{9331,
abstract = {Quantum entanglement has been generated and verified in cold-atom experiments and used to make atom-interferometric measurements below the shot-noise limit. However, current state-of-the-art cold-atom devices exploit separable (i.e., unentangled) atomic states. This perspective piece asks the question: can entanglement usefully improve cold-atom sensors, in the sense that it gives new sensing capabilities unachievable with current state-of-the-art devices? We briefly review the state-of-the-art in precision cold-atom sensing, focusing on clocks and inertial sensors, identifying the potential benefits entanglement could bring to these devices, and the challenges that need to be overcome to realize these benefits. We survey demonstrated methods of generating metrologically useful entanglement in cold-atom systems, note their relative strengths and weaknesses, and assess their prospects for near-to-medium term quantum-enhanced cold-atom sensing.},
author = {Szigeti, Stuart S. and Hosten, Onur and Haine, Simon A.},
issn = {0003-6951},
journal = {Applied Physics Letters},
number = {14},
publisher = {AIP Publishing},
title = {{Improving cold-atom sensors with quantum entanglement: Prospects and challenges}},
doi = {10.1063/5.0050235},
volume = {118},
year = {2021},
}
@article{8285,
abstract = {We demonstrate the utility of optical cavity generated spin-squeezed states in free space atomic fountain clocks in ensembles of 390 000 87Rb atoms. Fluorescence imaging, correlated to an initial quantum nondemolition measurement, is used for population spectroscopy after the atoms are released from a confining lattice. For a free fall time of 4 milliseconds, we resolve a single-shot phase sensitivity of 814(61) microradians, which is 5.8(0.6) decibels (dB) below the quantum projection limit. We observe that this squeezing is preserved as the cloud expands to a roughly 200 μm radius and falls roughly 300 μm in free space. Ramsey spectroscopy with 240 000 atoms at a 3.6 ms Ramsey time results in a single-shot fractional frequency stability of 8.4(0.2)×10−12, 3.8(0.2) dB below the quantum projection limit. The sensitivity and stability are limited by the technical noise in the fluorescence detection protocol and the microwave system, respectively.},
author = {Malia, Benjamin K. and Martínez-Rincón, Julián and Wu, Yunfan and Hosten, Onur and Kasevich, Mark A.},
issn = {1079-7114},
journal = {Physical Review Letters},
number = {4},
publisher = {American Physical Society},
title = {{Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit}},
doi = {10.1103/PhysRevLett.125.043202},
volume = {125},
year = {2020},
}
@article{8319,
abstract = {We demonstrate that releasing atoms into free space from an optical lattice does not deteriorate cavity-generated spin squeezing for metrological purposes. In this work, an ensemble of 500000 spin-squeezed atoms in a high-finesse optical cavity with near-uniform atom-cavity coupling is prepared, released into free space, recaptured in the cavity, and probed. Up to ∼10 dB of metrologically relevant squeezing is retrieved for 700μs free-fall times, and decaying levels of squeezing are realized for up to 3 ms free-fall times. The degradation of squeezing results from loss of atom-cavity coupling homogeneity between the initial squeezed state generation and final collective state readout. A theoretical model is developed to quantify this degradation and this model is experimentally validated.},
author = {Wu, Yunfan and Krishnakumar, Rajiv and Martínez-Rincón, Julián and Malia, Benjamin K. and Hosten, Onur and Kasevich, Mark A.},
issn = {2469-9934},
journal = {Physical Review A},
number = {1},
publisher = {American Physical Society},
title = {{Retrieval of cavity-generated atomic spin squeezing after free-space release}},
doi = {10.1103/PhysRevA.102.012224},
volume = {102},
year = {2020},
}
@article{593,
abstract = {Bell correlations, indicating nonlocality in composite quantum systems, were until recently only seen in small systems. Here, we demonstrate Bell correlations in squeezed states of 5×105 Rb87 atoms. The correlations are inferred using collective measurements as witnesses and are statistically significant to 124 standard deviations. The states are both generated and characterized using optical-cavity aided measurements.},
author = {Engelsen, Nils and Krishnakumar, Rajiv and Hosten, Onur and Kasevich, Mark},
journal = {Physical Review Letters},
number = {14},
publisher = {American Physical Society},
title = {{Bell correlations in spin-squeezed states of 500 000 atoms}},
doi = {10.1103/PhysRevLett.118.140401},
volume = {118},
year = {2017},
}
@article{587,
abstract = {Quantum metrology exploits entangled states of particles to improve sensing precision beyond the limit achievable with uncorrelated particles. All previous methods required detection noise levels below this standard quantum limit to realize the benefits of the intrinsic sensitivity provided by these states.We experimentally demonstrate a widely applicable method for entanglement-enhanced measurements without low-noise detection. The method involves an intermediate quantum phase magnification step that eases implementation complexity. We used it to perform squeezed-state metrology 8 decibels below the standard quantum limit with a detection system that has a noise floor 10 decibels above the standard quantum limit.},
author = {Onur Hosten and Krishnakumar, Rajiv and Engelsen, Nils J and Kasevich, Mark A},
journal = {Science},
number = {6293},
pages = {1552 -- 1555},
publisher = {American Association for the Advancement of Science},
title = {{Quantum phase magnification}},
doi = {10.1126/science.aaf3397},
volume = {352},
year = {2016},
}
@article{588,
abstract = {Quantum metrology uses quantum entanglement - correlations in the properties of microscopic systems - to improve the statistical precision of physical measurements. When measuring a signal, such as the phase shift of a light beam or an atomic state, a prominent limitation to achievable precision arises from the noise associated with the counting of uncorrelated probe particles. This noise, commonly referred to as shot noise or projection noise, gives rise to the standard quantum limit (SQL) to phase resolution. However, it can be mitigated down to the fundamental Heisenberg limit by entangling the probe particles. Despite considerable experimental progress in a variety of physical systems, a question that persists is whether these methods can achieve performance levels that compare favourably with optimized conventional (non-entangled) systems. Here we demonstrate an approach that achieves unprecedented levels of metrological improvement using half a million 87Rb atoms in their 'clock' states. The ensemble is 20.1 ± 0.3 decibels (100-fold) spin-squeezed via an optical-cavity-based measurement. We directly resolve small microwave-induced rotations 18.5 ± 0.3 decibels (70-fold) beyond the SQL. The single-shot phase resolution of 147 microradians achieved by the apparatus is better than that achieved by the best engineered cold atom sensors despite lower atom numbers. We infer entanglement of more than 680 ± 35 particles in the atomic ensemble. Applications include atomic clocks, inertial sensors, and fundamental physics experiments such as tests of general relativity or searches for electron electric dipole moment. To this end, we demonstrate an atomic clock measurement with a quantum enhancement of 10.5 ± 0.3 decibels (11-fold), limited by the phase noise of our microwave source.},
author = {Onur Hosten and Engelsen, Nils J and Krishnakumar, Rajiv and Kasevich, Mark A},
journal = {Nature},
number = {7587},
pages = {505 -- 508},
publisher = {Nature Publishing Group},
title = {{Measurement noise 100 times lower than the quantum-projection limit using entangled atoms}},
doi = {10.1038/nature16176},
volume = {529},
year = {2016},
}
@inproceedings{592,
abstract = {We create up to 20 dB spin-squeezed states of atomic ensembles using an optical cavity-based measurement. The prepared states are suitable for atomic sensors that require free space release of the atoms.},
author = {Engelsen, Nils and Hosten, Onur and Krishnakumar, Rajiv and Kasevich, Mark},
location = {San Jose, CA, United States},
publisher = {IEEE},
title = {{Engineering spin squeezed states for quantum-enhanced atom interferometry}},
year = {2016},
}
@article{589,
abstract = {We demonstrate a many-atom-cavity system with a high-finesse dual-wavelength standing wave cavity in which all participating rubidium atoms are nearly identically coupled to a 780-nm cavity mode. This homogeneous coupling is enforced by a one-dimensional optical lattice formed by the field of a 1560-nm cavity mode.},
author = {Lee, Jongmin and Vrijsen, Geert and Teper, Igor and Onur Hosten and Kasevich, Mark A},
journal = {Optics Letters},
number = {13},
pages = {4005 -- 4008},
publisher = {OSA},
title = {{Many-atom-cavity QED system with homogeneous atom-cavity coupling}},
doi = {10.1364/OL.39.004005},
volume = {39},
year = {2014},
}
@inproceedings{590,
abstract = {We present two methods of creating two orthogonally-polarized focal points at customizable relative locations. These schemes may be critical for enhancing entanglement sources and other applications.},
author = {Schmid, David and Huang, Ting-Yu and Dirks, Radhika and Onur Hosten and Kwiat, Paul G},
publisher = {OSA},
title = {{Polarization dependent focusing}},
doi = {10.1364/QIM.2013.W6.23},
year = {2013},
}
@article{591,
abstract = {We present two methods for the precise independent focusing of orthogonal linear polarizations of light at arbitrary relative locations. Our first scheme uses a displaced lens in a polarization Sagnac interferometer to provide adjustable longitudinal and lateral focal displacements via simple geometry; the second uses uniaxial crystals to achieve the same effect in a compact collinear setup. We develop the theoretical applications and limitations of our schemes, and provide experimental confirmation of our calculations.},
author = {Schmid, David and Huang, Ting-Yu and Hazrat, Shiraz and Dirks, Radhika and Onur Hosten and Quint, Stephan and Thian, Dickson and Kwiat, Paul G},
journal = {Optics Express},
number = {13},
pages = {15538 -- 15552},
publisher = {Optical Society of America},
title = {{Adjustable and robust methods for polarization-dependent focusing}},
doi = {10.1364/OE.21.015538},
volume = {21},
year = {2013},
}
@article{580,
author = {Onur Hosten},
journal = {Nature},
number = {7350},
pages = {170 -- 171},
publisher = {Nature Publishing Group},
title = {{Quantum physics: How to catch a wave}},
doi = {10.1038/474170a},
volume = {474},
year = {2011},
}
@inproceedings{585,
abstract = {We present two independent schemes for the precise focusing of orthogonal polarizations of light at arbitrary relative locations. The first scheme uses a polarization Sagnac interferometer, the second a set of three birefringent elements.
},
author = {Schmid, David and Hazrat, Shiraz and Rangarajan, Radhika and Onur Hosten and Quint, Stephan and Kwiat, Paul G},
publisher = {OSA},
title = {{Methods towards achieving precise birefringent focusing}},
doi = {10.1364/CLEO_AT.2011.JThB130},
year = {2011},
}