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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.

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Summary
This summary is machine-generated.

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.

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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.