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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Optimal multi-photon phase sensing with a single interference fringe.

G Y Xiang1, H F Hofmann, G J Pryde

  • 11] Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University, Brisbane, 4111, Australia [2] Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China.

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Summary
This summary is machine-generated.

Quantum entanglement enhances optical phase measurements. Researchers found the Holland-Burnett state, not the NOON state, offers optimal sensitivity, achieving measurements three times below the shot noise limit.

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Area of Science:

  • Quantum optics
  • Quantum metrology
  • Quantum information science

Background:

  • Quantum entanglement offers enhanced precision for optical phase measurements, potentially surpassing the shot noise limit (SNL) to reach the Heisenberg limit.
  • Achieving the Heisenberg limit typically requires N-photon parity measurements, which are experimentally challenging due to the need for high-fidelity photon distribution detection.
  • Previous experiments achieving super-SNL precision have utilized simpler photon-number detection patterns instead of full parity measurements.

Purpose of the Study:

  • To investigate the phase sensitivity achievable with a simplified single interference fringe detection technique.
  • To determine the optimal entangled state for phase sensitivity beyond the SNL, particularly for N > 4 photons.
  • To experimentally validate the performance of the Holland-Burnett state for enhanced phase sensitivity.

Main Methods:

  • Theoretical analysis of phase sensitivity for different entangled states using single interference fringe detection.
  • Experimental implementation of a measurement scheme utilizing a single photon-counted fringe.
  • Utilizing six-photon Holland-Burnett states for the experimental demonstration.

Main Results:

  • The maximally-entangled NOON state does not provide optimal phase sensitivity for N > 4 photons.
  • The Holland-Burnett state is identified as the optimal state for achieving enhanced phase sensitivity.
  • Experimental demonstration with a six-photon Holland-Burnett state achieved a phase variance three times below the SNL.

Conclusions:

  • Simple single interference fringe detection can achieve enhanced phase sensitivity beyond the SNL.
  • The Holland-Burnett state offers superior performance for optical phase measurements compared to the NOON state for N > 4.
  • Experimental validation confirms the theoretical predictions, paving the way for more precise optical measurements.