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Snapshotting quantum dynamics at multiple time points.

Pengfei Wang1,2, Hyukjoon Kwon3, Chun-Yang Luan2,4,5

  • 1Beijing Academy of Quantum Information Sciences, Beijing, China.

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|October 15, 2024
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Summary
This summary is machine-generated.

Researchers developed snapshotting quantum dynamics to overcome measurement disturbance. This method enables accurate multi-time quantum statistics and correlation function extraction, revealing quantum coherence.

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Area of Science:

  • Quantum Information Science
  • Quantum Dynamics
  • Experimental Quantum Physics

Background:

  • Measurement-induced state disturbance complicates multi-time quantum statistics.
  • Extracting quantum dynamics at intermediate time points is challenging.

Purpose of the Study:

  • To propose and experimentally demonstrate a method for snapshotting quantum dynamics.
  • To reconstruct multi-time quasi-probability distributions (QPDs) and correlation functions.
  • To overcome limitations of measurement-induced state disturbance.

Main Methods:

  • Ancilla-assisted measurements with classical post-processing to cancel measurement impact.
  • Repeated initialization and detection of ancilla states without direct system measurement.
  • Utilizing a dual-species trapped-ion system (171Yb+ and 138Ba+).

Main Results:

  • Successfully reconstructed two- and three-time QPDs and correlation functions.
  • Demonstrated reliable extraction of dynamic information at intermediate time points.
  • Observed negativity and complex values in QPDs, indicating quantum coherence.

Conclusions:

  • Snapshotting quantum dynamics provides a viable method for multi-time quantum measurements.
  • The protocol reliably extracts quantum statistics and correlation functions.
  • Experimental validation confirms the presence of quantum coherence during dynamics.