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Universal compressive characterization of quantum dynamics

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Kim, Yosep and Yong-Siah, Teo and Daekun, Ahn and Im, Dong Gil and Cho, Young Wook and Leuchs, Gerd and Sánchez Soto, Luis Lorenzo and Hynseok, Jeong and Kim, Yoon-Ho (2020) Universal compressive characterization of quantum dynamics. Physical review letters, 124 (21). ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.124.210401


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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.


Item Type:Article
Additional Information:

© 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].

Uncontrolled Keywords:Signal recovery; Entanglement
Subjects:Sciences > Physics > Optics
ID Code:60932
Deposited On:16 Jun 2020 10:16
Last Modified:16 Jun 2020 10:16

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