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Updated: May 7, 2026
12:19
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
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.
Scientific Reports
|September 27, 2013
Summary
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.
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.
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