Snapshotting quantum dynamics at multiple time points.

Autor: Wang P; Beijing Academy of Quantum Information Sciences, Beijing, China.; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China., Kwon H; Korea Institute for Advanced Study, Seoul, Korea. hjkwon@kias.re.kr., Luan CY; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China.; Institute for Quantum Science and Technology, College of Science, National University of Defense Technology, Changsha, China.; Hunan Key Laboratory of Mechanism and Technology of Quantum Information, Changsha, China., Chen W; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China., Qiao M; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China., Zhou Z; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China., Wang K; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China., Kim MS; Korea Institute for Advanced Study, Seoul, Korea. m.kim@imperial.ac.uk.; Blackett Laboratory, Imperial College London, London, United Kingdom. m.kim@imperial.ac.uk., Kim K; Beijing Academy of Quantum Information Sciences, Beijing, China. kimkihwan@mail.tsinghua.edu.cn.; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China. kimkihwan@mail.tsinghua.edu.cn.; Hefei National Laboratory, Hefei, P. R. China. kimkihwan@mail.tsinghua.edu.cn.; Frontier Science Center for Quantum Information, Beijing, China. kimkihwan@mail.tsinghua.edu.cn.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Oct 16; Vol. 15 (1), pp. 8900. Date of Electronic Publication: 2024 Oct 16.
DOI: 10.1038/s41467-024-53051-5
Abstrakt: Measurement-induced state disturbance is a major challenge in obtaining quantum statistics at multiple time points. We propose a method to extract dynamic information from a quantum system at intermediate time points, namely snapshotting quantum dynamics. To this end, we apply classical post-processing after performing the ancilla-assisted measurements to cancel out the impact of the measurements at each time point. Based on this, we reconstruct a multi-time quasi-probability distribution (QPD) that correctly recovers the probability distributions at the respective time points. Our approach can also be applied to simultaneously extract exponentially many correlation functions with various time-orderings. We provide a proof-of-principle experimental demonstration of the proposed protocol using a dual-species trapped-ion system by employing 171 Yb + and 138 Ba + ions as the system and the ancilla, respectively. Multi-time measurements are performed by repeated initialization and detection of the ancilla state without directly measuring the system state. The two- and three-time QPDs and correlation functions are reconstructed reliably from the experiment, negativity and complex values in the QPDs clearly indicate a contribution of the quantum coherence throughout dynamics.
(© 2024. The Author(s).)
Databáze: MEDLINE
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