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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Phase estimation via quantum interferometry for noisy detectors.

Nicolò Spagnolo1, Chiara Vitelli, Vito Giovanni Lucivero

  • 1Dipartimento di Fisica, Sapienza Università di Roma, piazzale Aldo Moro 5, I-00185 Roma, Italy.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

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This study presents a practical method to enhance optical interferometry sensitivity despite detector losses. The technique uses phase-sensitive amplification to achieve optimal accuracy without needing prior loss characterization.

Area of Science:

  • Quantum optics
  • Optical interferometry
  • Metrology

Background:

  • Sensitivity in optical interferometry is limited by signal propagation and detector losses.
  • Optimal quantum states for lossy environments exist but may not outperform classical methods when detector loss is neglected.
  • Practical interferometry often faces imperfect detectors, hindering optimal performance.

Purpose of the Study:

  • To experimentally demonstrate a method for achieving optimal phase estimation accuracy in optical interferometry, even with imperfect detectors.
  • To present a practical technique that overcomes limitations imposed by signal loss and detector inefficiency.
  • To enable high-sensitivity interferometry using readily available coherent states.

Main Methods:

  • Employing phase-sensitive amplification after phase sensing but before signal detection.

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Last Updated: May 18, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

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  • Utilizing coherent states as input signals for the interferometric experiment.
  • Experimental demonstration of a phase estimation protocol incorporating the amplification technique.

    • Main Results:

    • Successfully demonstrated a phase estimation experiment operating at its optimal working regime.
    • Achieved high sensitivity comparable to theoretical limits, even in the presence of detector losses.
    • Validated the feasibility of using phase-sensitive amplification with coherent states for practical interferometry.

    Conclusions:

    • The proposed method offers a practical route to high-sensitivity optical interferometry by mitigating the impact of detector losses.
    • Unlike previous optimal strategies, this technique does not require precise prior knowledge of loss parameters.
    • The use of coherent states makes this approach readily implementable in existing interferometric setups.