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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Error-Mitigated Quantum Metrology via Virtual Purification.

Kaoru Yamamoto¹, Suguru Endo^1,2, Hideaki Hakoshima^3,4

¹NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan.

Physical Review Letters

|January 6, 2023

Summary

This summary is machine-generated.

This study introduces error mitigation for quantum metrology, overcoming unknown noise fluctuations that limit precision. The new method, using purification, recovers quantum advantages lost to systematic errors, enabling more reliable quantum measurements.

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Area of Science:

Quantum Information Science
Quantum Metrology
Quantum Error Mitigation

Background:

Quantum metrology utilizes entangled resources to surpass the standard quantum limit, even with environmental noise.
Current approaches often assume perfect knowledge of noise models, neglecting real-world coherence time fluctuations.
Unknown fluctuating noise introduces systematic errors, negating quantum advantages.

Purpose of the Study:

To propose and demonstrate an error-mitigated quantum metrology protocol.
To address the challenge of unknown fluctuating noise in quantum measurements.
To recover superclassical scaling in practical quantum metrology scenarios.

Main Methods:

Developed a quantum metrology protocol incorporating purification-based quantum error mitigation.
Simulated and analyzed the protocol's performance under time-inhomogeneous, bias-inducing noise.
Focused on filtering out unknown, fluctuating noise sources.

Main Results:

The proposed protocol effectively mitigates systematic errors caused by unknown fluctuating noise.
Superclassical scaling was recovered in a practical, noisy quantum metrology setting.
Demonstrated the first successful application of purification-based error mitigation for unknown fluctuating noise.

Conclusions:

Purification-based quantum error mitigation is effective against unknown fluctuating noise.
This approach enables practical quantum metrology with enhanced precision.
The findings have implications for quantum computation affected by similar noise.