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Metrological Nonlinear Squeezing Parameter.

Manuel Gessner1,2, Augusto Smerzi2, Luca Pezzè2

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|April 2, 2019
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This summary is machine-generated.

New nonlinear squeezing parameters characterize non-Gaussian quantum states, improving precision for phase estimation and entanglement detection. These advanced methods offer optimized, feasible quantum measurement strategies.

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Area of Science:

  • Quantum Metrology
  • Quantum Information Science

Background:

  • Metrological linear squeezing parameters quantify Gaussian quantum state sensitivity.
  • These parameters are inadequate for characterizing non-Gaussian states.

Purpose of the Study:

  • Introduce metrological nonlinear squeezing parameters for non-Gaussian states.
  • Enable precise characterization of complex quantum states.

Main Methods:

  • Analytically optimize measurement observables for nonlinear operators.
  • Develop moment-based estimation for phase parameters.

Main Results:

  • Successfully characterized non-Gaussian quantum states.
  • Provided optimized, experimentally feasible recipes for phase estimation.
  • Enabled construction of multipartite entanglement and nonclassicality witnesses.

Conclusions:

  • Nonlinear squeezing parameters offer a robust method for quantifying non-Gaussian quantum state sensitivity.
  • The developed techniques advance high-precision quantum measurements and state characterization.