{"title":"Controllable states of superconducting Qubit ensembles","project":[{"name":"International IST Doctoral Program","call_identifier":"H2020","grant_number":"665385","_id":"2564DBCA-B435-11E9-9278-68D0E5697425"},{"_id":"26336814-B435-11E9-9278-68D0E5697425","grant_number":"758053","call_identifier":"H2020","name":"A Fiber Optic Transceiver for Superconducting Qubits"},{"call_identifier":"H2020","name":"Quantum readout techniques and technologies","_id":"237CBA6C-32DE-11EA-91FC-C7463DDC885E","grant_number":"862644"}],"citation":{"mla":"Redchenko, Elena. <i>Controllable States of Superconducting Qubit Ensembles</i>. Institute of Science and Technology Austria, 2022, doi:<a href=\"https://doi.org/10.15479/at:ista:12132\">10.15479/at:ista:12132</a>.","short":"E. Redchenko, Controllable States of Superconducting Qubit Ensembles, Institute of Science and Technology Austria, 2022.","ama":"Redchenko E. Controllable states of superconducting Qubit ensembles. 2022. doi:<a href=\"https://doi.org/10.15479/at:ista:12132\">10.15479/at:ista:12132</a>","ieee":"E. Redchenko, “Controllable states of superconducting Qubit ensembles,” Institute of Science and Technology Austria, 2022.","chicago":"Redchenko, Elena. “Controllable States of Superconducting Qubit Ensembles.” Institute of Science and Technology Austria, 2022. <a href=\"https://doi.org/10.15479/at:ista:12132\">https://doi.org/10.15479/at:ista:12132</a>.","apa":"Redchenko, E. (2022). <i>Controllable states of superconducting Qubit ensembles</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:12132\">https://doi.org/10.15479/at:ista:12132</a>","ista":"Redchenko E. 2022. Controllable states of superconducting Qubit ensembles. Institute of Science and Technology Austria."},"date_published":"2022-09-26T00:00:00Z","ec_funded":1,"month":"09","year":"2022","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-024-4"]},"status":"public","author":[{"full_name":"Redchenko, Elena","id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87","first_name":"Elena","last_name":"Redchenko"}],"oa_version":"Published Version","alternative_title":["ISTA Thesis"],"date_updated":"2023-05-26T09:29:07Z","has_accepted_license":"1","page":"168","type":"dissertation","doi":"10.15479/at:ista:12132","ddc":["530"],"file":[{"embargo":"2022-12-28","relation":"main_file","file_size":56076868,"checksum":"39eabb1e006b41335f17f3b29af09648","access_level":"open_access","date_created":"2023-01-25T09:41:49Z","date_updated":"2023-01-26T23:30:44Z","content_type":"application/pdf","file_name":"Final_Thesis_ES_Redchenko.pdf","file_id":"12367","creator":"cchlebak"}],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","article_processing_charge":"No","acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"},{"_id":"EM-Fac"}],"publisher":"Institute of Science and Technology Austria","day":"26","department":[{"_id":"GradSch"},{"_id":"JoFi"}],"date_created":"2023-01-25T09:17:02Z","supervisor":[{"last_name":"Fink","orcid":"0000-0001-8112-028X","first_name":"Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M"}],"degree_awarded":"PhD","file_date_updated":"2023-01-26T23:30:44Z","abstract":[{"text":"Recent substantial advances in the feld of superconducting circuits have shown its\r\npotential as a leading platform for future quantum computing. In contrast to classical\r\ncomputers based on bits that are represented by a single binary value, 0 or 1, quantum\r\nbits (or qubits) can be in a superposition of both. Thus, quantum computers can store\r\nand handle more information at the same time and a quantum advantage has already\r\nbeen demonstrated for two types of computational tasks. Rapid progress in academic\r\nand industry labs accelerates the development of superconducting processors which may\r\nsoon fnd applications in complex computations, chemical simulations, cryptography, and\r\noptimization. Now that these machines are scaled up to tackle such problems the questions\r\nof qubit interconnects and networks becomes very relevant. How to route signals on-chip\r\nbetween diferent processor components? What is the most efcient way to entangle\r\nqubits? And how to then send and process entangled signals between distant cryostats\r\nhosting superconducting processors?\r\nIn this thesis, we are looking for solutions to these problems by studying the collective\r\nbehavior of superconducting qubit ensembles. We frst demonstrate on-demand tunable\r\ndirectional scattering of microwave photons from a pair of qubits in a waveguide. Such a\r\ndevice can route microwave photons on-chip with a high diode efciency. Then we focus\r\non studying ultra-strong coupling regimes between light (microwave photons) and matter\r\n(superconducting qubits), a regime that could be promising for extremely fast multi-qubit\r\nentanglement generation. Finally, we show coherent pulse storage and periodic revivals\r\nin a fve qubit ensemble strongly coupled to a resonator. Such a reconfgurable storage\r\ndevice could be used as part of a quantum repeater that is needed for longer-distance\r\nquantum communication.\r\nThe achieved high degree of control over multi-qubit ensembles highlights not only the\r\nbeautiful physics of circuit quantum electrodynamics, it also represents the frst step\r\ntoward new quantum simulation and communication methods, and certain techniques\r\nmay also fnd applications in future superconducting quantum computing hardware.\r\n","lang":"eng"}],"_id":"12366","oa":1,"publication_status":"published","language":[{"iso":"eng"}]}