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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Phase detection at the quantum limit with multiphoton Mach-Zehnder interferometry.

L Pezzé1, A Smerzi, G Khoury

  • 1BEC-CNR-INFM and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy.

Physical Review Letters
|February 1, 2008
PubMed
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This study demonstrates an optimal quantum phase estimation strategy using a Mach-Zehnder interferometer. The Bayesian approach achieves the standard quantum limit, offering unbiased and precise phase measurements.

Area of Science:

  • Quantum optics
  • Quantum metrology
  • Interferometry

Background:

  • Mach-Zehnder interferometers are crucial for phase sensing.
  • Quantum properties can enhance measurement precision beyond classical limits.
  • Bayesian inference offers a framework for optimal parameter estimation.

Purpose of the Study:

  • To develop and implement an optimal quantum phase estimation strategy.
  • To achieve the standard quantum limit for phase estimation in a Mach-Zehnder interferometer.
  • To demonstrate robustness against phase shift values and noise.

Main Methods:

  • Utilizing a Mach-Zehnder interferometer with coherent state and vacuum inputs.
  • Implementing a Bayesian phase estimation protocol.
  • Employing parallel photon-number-resolving detectors and coincidence logic.

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Last Updated: Jul 7, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Published on: April 4, 2017

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

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07:56

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Published on: September 5, 2019

Main Results:

  • The implemented protocol achieves the standard quantum limit.
  • The phase estimation is independent of the true phase shift and noise assumptions.
  • The strategy is unbiased and saturates the Cramer-Rao bound.

Conclusions:

  • The developed Bayesian phase estimation strategy is optimal.
  • This method provides a robust and highly precise approach to quantum phase sensing.
  • The experimental implementation validates the theoretical predictions for quantum metrology.