[{"year":"2025","date_published":"2025-04-01T00:00:00Z","citation":{"ama":"Sett R.  Quantum remote sensing and non-equilibrium phase transitions in the microwave regime. 2025. doi:<a href=\"https://doi.org/10.15479/AT-ISTA-19533\">10.15479/AT-ISTA-19533</a>","chicago":"Sett, Riya. “ Quantum Remote Sensing and Non-Equilibrium Phase Transitions in the Microwave Regime.” Institute of Science and Technology Austria, 2025. <a href=\"https://doi.org/10.15479/AT-ISTA-19533\">https://doi.org/10.15479/AT-ISTA-19533</a>.","short":"R. Sett,  Quantum Remote Sensing and Non-Equilibrium Phase Transitions in the Microwave Regime, Institute of Science and Technology Austria, 2025.","apa":"Sett, R. (2025). <i> Quantum remote sensing and non-equilibrium phase transitions in the microwave regime</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT-ISTA-19533\">https://doi.org/10.15479/AT-ISTA-19533</a>","ieee":"R. Sett, “ Quantum remote sensing and non-equilibrium phase transitions in the microwave regime,” Institute of Science and Technology Austria, 2025.","mla":"Sett, Riya. <i> Quantum Remote Sensing and Non-Equilibrium Phase Transitions in the Microwave Regime</i>. Institute of Science and Technology Austria, 2025, doi:<a href=\"https://doi.org/10.15479/AT-ISTA-19533\">10.15479/AT-ISTA-19533</a>.","ista":"Sett R. 2025.  Quantum remote sensing and non-equilibrium phase transitions in the microwave regime. Institute of Science and Technology Austria."},"publisher":"Institute of Science and Technology Austria","publication_identifier":{"issn":["2663-337X"]},"article_processing_charge":"No","doi":"10.15479/AT-ISTA-19533","degree_awarded":"PhD","publication_status":"published","date_updated":"2026-04-16T12:20:42Z","department":[{"_id":"GradSch"},{"_id":"JoFi"}],"month":"04","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"title":" Quantum remote sensing and non-equilibrium phase transitions in the microwave regime","ec_funded":1,"day":"1","oa_version":"Published Version","alternative_title":["ISTA Thesis"],"project":[{"name":"Quantum readout techniques and technologies","_id":"237CBA6C-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","grant_number":"862644"},{"_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","grant_number":"F07105"}],"abstract":[{"lang":"eng","text":"This thesis explores advancements in quantum remote sensing and non-equilibrium phase\r\ntransitions in the microwave regime, with a focus on dissipative phase transitions and quantumenhanced sensing.\r\nIn the first project, I experimentally studied photon blockade breakdown as a dissipative phase\r\ntransition in a zero-dimensional cavity-qubit system. By defining an appropriate thermodynamic\r\nlimit, we demonstrated that the observed bistability is a genuine signature of a first-order\r\nphase transition in this system. This work provides insight into non-equilibrium quantum\r\ndynamics and phase transitions in driven-dissipative open quantum systems.\r\nThe second project focuses on the experimental realization of a phase-conjugate receiver for\r\nquantum illumination (QI), a quantum sensing protocol that enhances target detection in noisy\r\nenvironments using entangled light. While an ideal spontaneous parametric down-conversion\r\n(SPDC) source and receiver could, in theory, provide up to a 6 dB advantage over classical\r\nillumination, no such ideal receiver exists. Instead, we explore an experimental realization of a\r\nphase-conjugate receiver for QI in the microwave regime at millikelvin temperatures using a\r\nJosephson parametric converter (JPC) as a source of continuous-variable Gaussian entangled\r\nsignal-idler pairs, where a maximum 3 dB advantage is theoretically achievable. We investigate\r\nkey experimental limitations that constrain practical QI performance, contributing to the\r\ndevelopment of quantum-enhanced sensing.\r\nAdditionally, this thesis presents efficient digital signal processing (DSP) techniques implemented in C++ and Python in collaboration with Przemysław Zieliński and Luka Drmić. These\r\nmethods, optimized using the Intel Integrated Performance Primitives (IPP) library, have been\r\nessential in data acquisition, noise filtering, and correlation analysis across multiple research\r\nprojects. Although not real-time, these DSP techniques significantly enhance the accuracy of\r\nquantum measurements.\r\nOverall, this thesis advances quantum-enhanced sensing by establishing the thermodynamic\r\nlimit in a single transmon-cavity system and experimentally exploring a phase-conjugate receiver\r\nfor QI. These findings contribute to quantum metrology, particularly for weak signal detection\r\nand remote sensing in noisy environments.\r\n"}],"oa":1,"related_material":{"record":[{"relation":"research_data","status":"public","id":"18978"},{"status":"public","id":"19280","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","id":"13117","status":"public"},{"relation":"part_of_dissertation","status":"public","id":"17183"}]},"_id":"19533","OA_place":"publisher","corr_author":"1","file_date_updated":"2025-10-11T22:30:02Z","acknowledgement":"I acknowledge the generous financial support of the Austrian Science Fund (FWF) via BeyondC\r\n(F7105) and the European Union’s Horizon 2020 research and innovation program (FETopen\r\nQUARTET, Grant Agreement No. 862644), which made this research possible. I also extend\r\nmy sincere appreciation to the MIBA workshop and the Institute of Science and Technology\r\nAustria nanofabrication facility for their technical assistance, which was instrumental in realizing\r\nthis work.","author":[{"last_name":"Sett","id":"2E6D040E-F248-11E8-B48F-1D18A9856A87","full_name":"Sett, Riya","first_name":"Riya","orcid":"0000-0001-7641-8348"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","type":"dissertation","date_created":"2025-04-09T16:44:26Z","status":"public","keyword":["phase transition","open quantum system","phase diagram","cavity quantum electrodynamics","superconducting qubits","semiclassical physics","quantum optics","josephson junction","parametric converter","phase conjugation","quantum radar","quantum entanglement","correlation","quantum sensing"],"supervisor":[{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M","first_name":"Johannes M","orcid":"0000-0001-8112-028X"}],"language":[{"iso":"eng"}],"acknowledged_ssus":[{"_id":"ScienComp"},{"_id":"M-Shop"},{"_id":"NanoFab"},{"_id":"LifeSc"},{"_id":"SSU"}],"has_accepted_license":"1","ddc":["530"],"file":[{"content_type":"application/pdf","embargo":"2025-10-11","date_updated":"2025-10-11T22:30:02Z","file_name":"PhD_Thesis_Riya_Sett_pdfa.pdf","creator":"rsett","file_id":"19538","checksum":"ba6cd2289d0141a160a14fc97df1632f","date_created":"2025-04-10T11:33:22Z","file_size":4129208,"relation":"main_file","access_level":"open_access"},{"date_created":"2025-04-10T11:34:08Z","checksum":"ee63a94cb8f7adf5e766903028b81ed6","access_level":"closed","file_size":6646110,"relation":"source_file","date_updated":"2025-10-11T22:30:02Z","file_name":"PhD Thesis Riya Sett.zip","content_type":"application/x-zip-compressed","embargo_to":"open_access","creator":"rsett","file_id":"19539"}],"page":"109"}]