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Correlated Noise Estimation with Quantum Sensor Networks
Anthony J Brady1,2, Yu-Xin Wang1, Victor V Albert1
1Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland 20742, USA.
Physical Review Letters
|March 13, 2026
Summary
This study introduces a quantum sensing framework to estimate collective noise in quantum sensor networks. Entanglement provides an advantage by combining quantum sensor correlations with classical noise correlations for enhanced measurement sensitivity.
Area of Science:
- Quantum Metrology
- Quantum Information Science
- Statistical Physics
Background:
- Estimating collective stochastic properties in quantum sensor networks is crucial for applications like quantum computing and precision measurement.
- Correlated noise, such as dephasing in qubit ensembles or fluctuations in bosonic modes, poses a significant challenge to accurate estimation.
Purpose of the Study:
- To develop a theoretical framework for estimating correlated noise in quantum sensor networks.
- To identify the conditions under which entanglement provides an advantage in quantum metrology.
- To determine optimal entangled states and sensing protocols for achieving fundamental measurement limits.
Main Methods:
- Development of a theoretical framework to analyze correlated noise estimation in quantum sensor networks.
- Investigation of the interplay between quantum correlations of sensors and classical correlations of noise.
- Determination of optimal entangled probe states and a many-body echo-like sensing protocol.
Main Results:
- Revealed that an entanglement advantage emerges from the synergy between quantum sensor correlations and classical noise correlations.
- Identified optimal entangled probe states for enhanced noise estimation.
- Demonstrated a sensing protocol that achieves fundamental limits of measurement sensitivity for correlated many-body phenomena.
Conclusions:
- The study provides a theoretical foundation for entanglement-enhanced metrology of correlated many-body phenomena.
- The proposed framework and protocol offer a route to overcome limitations imposed by correlated noise in quantum sensing.
- This work advances the understanding of quantum correlations in achieving ultimate measurement precision.
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