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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.
Nature Communications
|October 15, 2024
Summary
Researchers developed snapshotting quantum dynamics to overcome measurement disturbance. This method enables accurate multi-time quantum statistics and correlation function extraction, revealing quantum coherence.
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.
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