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Selective Detection of Dynamics-Complete Set of Correlations via Quantum Channels
Ze Wu1,2, Ping Wang3,4, Tianyun Wang1,2
1CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
Physical Review Letters
|June 3, 2024
Summary
Researchers developed a universal quantum protocol to measure all time-ordered correlations (TOCs), crucial for understanding quantum systems. This breakthrough enables precise characterization of quantum states and noise, advancing quantum technologies.
Area of Science:
- Quantum Physics
- Quantum Information Science
Background:
- Understanding many-body systems and advancing quantum technologies requires analyzing fluctuations and correlations.
- Fully describing physical system dynamics necessitates accessing the complete set of time-ordered correlations (TOCs).
- Current measurement techniques are limited, lacking a systematic method for extracting dynamic-complete correlations.
Purpose of the Study:
- To propose a platform-universal protocol for selectively detecting arbitrary types of TOCs.
- To provide a feasible solution for extracting the dynamic-complete set of correlations.
- To demonstrate the utility of TOC knowledge in improving quantum optimal control precision.
Main Methods:
- Synthesizing quantum channels with various controls to engineer specific sensor-target system evolutions.
- Designing system evolution paths that correspond to desired correlations.
- Experimental demonstration using nuclear magnetic resonance (NMR) to detect previously inaccessible fourth-order TOCs.
Main Results:
- Successful implementation of a platform-universal protocol to detect arbitrary TOCs.
- Experimental detection of a specific fourth-order TOC, previously inaccessible.
- Demonstration that TOC knowledge significantly enhances the precision of quantum optimal control.
Conclusions:
- The developed protocol offers a new, systematic method for accessing the dynamic-complete set of correlations.
- This advancement provides a crucial toolbox for characterizing quantum many-body states and quantum noise.
- The findings are expected to accelerate progress in quantum sensing and quantum computing.
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