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Hybrid quantum-classical approach to enhanced quantum metrology.
Xiaodong Yang1, Xi Chen1,2, Jun Li3,4
1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, China.
Scientific Reports
|January 13, 2021
Summary
This study introduces a hybrid quantum-classical method to optimize quantum metrology protocols, overcoming engineering complexity and noise. The approach automatically refines control strategies for enhanced precision in parameter estimation tasks.
Area of Science:
- Quantum physics
- Metrology
- Quantum information science
Background:
- Quantum metrology offers enhanced precision but faces challenges from complex entangled probes and environmental noise.
- Existing methods often require intricate off-line designs, limiting practical applications.
Purpose of the Study:
- To develop a novel, adaptive strategy for optimizing quantum metrology protocols.
- To overcome technological barriers in achieving high-precision parameter estimation with limited resources.
Main Methods:
- Introduced adjustable controls within the quantum encoding process.
- Employed a hybrid quantum-classical approach for online optimization of these controls.
- Demonstrated the scheme experimentally on a nuclear magnetic resonance (NMR) processor for frequency estimation.
Main Results:
- The developed scheme automatically optimizes control strategies without complex off-line design.
- The method demonstrated inherent correction capabilities for certain unitary errors during optimization.
- Successfully identified optimal probes for frequency estimation, showcasing practical applicability.
Conclusions:
- The proposed hybrid quantum-classical scheme offers a practical and robust method for enhancing quantum metrology precision.
- This approach paves the way for experimental auto-searching of optimal protocols, advancing the field of quantum sensing.
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