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Heisenberg-Limited Continuous-Variable Distributed Quantum Metrology with Arbitrary Weights.

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This summary is machine-generated.

Distributed quantum metrology (DQM) using two nonvacuum inputs allows measuring arbitrary parameter combinations. This study reveals a wide range of nonclassical states, including squeezed vacuum, can achieve quantum advantage in DQM networks.

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Metrology

Background:

  • Distributed quantum metrology (DQM) enhances parameter estimation using entangled quantum states.
  • Continuous-variable DQM utilizes linear networks with nonclassical inputs for improved sensitivity.

Purpose of the Study:

  • To fully characterize linear networks in continuous-variable DQM with two nonvacuum inputs.
  • To establish fundamental properties and bounds for DQM sensitivity.
  • To identify the necessary conditions for achieving quantum advantage in DQM.

Main Methods:

  • Analysis of linear quantum networks with two nonvacuum inputs.
  • Derivation of a universal and tight upper bound on DQM sensitivity.
  • Characterization of nonclassical input states required for quantum advantage.

Main Results:

  • Two nonvacuum inputs are necessary for measuring arbitrary linear combinations or global functions of distributed parameters.
  • A wide variety of nonclassical states, such as squeezed vacuum, enable quantum advantage.
  • Local photon number detection can achieve maximum sensitivity for certain nonclassical inputs.
  • DQM networks exhibit two regimes: Heisenberg scaling and multiplicative enhancement from weak nonclassical inputs.

Conclusions:

  • The study provides a comprehensive understanding of two-input DQM networks.
  • It clarifies the role and types of nonclassical states needed for quantum advantage.
  • The findings pave the way for enhanced precision in distributed sensing applications.