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Full-Period Quantum Phase Estimation.

Li-Zheng Liu1,2, Yue-Yang Fei1,2, Yingqiu Mao1,2

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Summary
This summary is machine-generated.

This study introduces a quantum phase estimation method using Kitaev

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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Sensing

Background:

  • Quantum sensing offers sensitivity beyond the standard quantum limit.
  • Current quantum sensing faces challenges with phase ambiguity and low sensitivity for small probe states.

Purpose of the Study:

  • To develop a full-period quantum phase estimation approach.
  • To overcome phase ambiguity and enhance sensitivity in quantum sensing.

Main Methods:

  • Utilized Kitaev's phase estimation algorithm.
  • Employed Greenberger-Horne-Zeilinger (GHZ) states for phase value acquisition.
  • Performed an eight-photon experiment.

Main Results:

  • Achieved a sensitivity upper bound of δθ=sqrt[3/(N^{2}+2N)] for N-party states, surpassing adaptive Bayesian estimation.
  • Demonstrated full-period estimation of unknown phases.
  • Observed phase superresolution and sensitivity beyond the shot-noise limit.

Conclusions:

  • The proposed method offers a novel approach for quantum sensing.
  • This work represents significant progress towards the practical application of quantum sensing.