Publication: Universal compressive characterization of quantum dynamics
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Publication Date
2020-05-27
Authors
Kim, Yosep
Yong-Siah, Teo
Daekun, Ahn
Im, Dong Gil
Cho, Young Wook
Leuchs, Gerd
Hynseok, Jeong
Kim, Yoon-Ho
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American Physical Society
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Abstract
Recent quantum technologies utilize complex multidimensional processes that govern the dynamics of quantum systems. We develop an adaptive diagonal-element-probing compression technique that feasibly characterizes any unknown quantum processes using much fewer measurements compared to conventional methods. This technique utilizes compressive projective measurements that are generalizable to an arbitrary number of subsystems. Both numerical analysis and experimental results with unitary gates demonstrate low measurement costs, of order O(d(2)) for d-dimensional systems, and robustness against statistical noise. Our work potentially paves the way for a reliable and highly compressive characterization of general quantum devices.
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© 2020 American Physical Society.
National Research Foundation of Korea (NRF)National Research Foundation of Korea [2019R1A2C3004812, 2019M3E4A1080074, 2019R1H1A3079890, 2020R1A2C1008609, 2019R1A6A1A10073437]; KIST institutional programKorea Institute of Science & Technology (KIST) [2E30620]; Spanish MINECO [FIS201567963-P, PGC2018-099183-B-I00]; Global Ph.D. Fellowship by the NRF [2015H1A2A1033028].