Universal Compressive Characterization of Quantum Dynamics

Yosep Kim, Yong Siah Teo, Daekun Ahn, Dong-Gil Im, Young-Wook Cho, Gerd Leuchs, Luis L. Sánchez-Soto, Hyunseok Jeong, and Yoon-Ho Kim
Phys. Rev. Lett. 124, 210401 – Published 27 May 2020
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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(d2) 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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  • Received 11 January 2020
  • Accepted 27 April 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.210401

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Yosep Kim1, Yong Siah Teo2,*, Daekun Ahn2, Dong-Gil Im1, Young-Wook Cho3, Gerd Leuchs4,5, Luis L. Sánchez-Soto4,6, Hyunseok Jeong2,†, and Yoon-Ho Kim1,‡

  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), 37673 Pohang, Korea
  • 2Department of Physics and Astronomy, Seoul National University, 08826 Seoul, Korea
  • 3Center for Quantum Information, Korea Institute of Science and Technology (KIST), 02792 Seoul, Korea
  • 4Max-Planck-Institut für die Physik des Lichts, Staudtstraße 2, 91058 Erlangen, Germany
  • 5Institute of Applied Physics, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia
  • 6Departamento de Óptica, Facultad de Física, Universidad Complutense, 28040 Madrid, Spain

  • *ys_teo@snu.ac.kr
  • jeongh@snu.ac.kr
  • yoonho72@gmail.com

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Issue

Vol. 124, Iss. 21 — 29 May 2020

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