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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Quantum-improved phase estimation with a displacement-assisted SU(1,1) interferometer.

Wei Ye, Chunping Chen, Shoukang Chang

|December 13, 2023

Summary

This summary is machine-generated.

This study introduces a displacement-assisted SU(1,1) interferometer (DSU(1,1)) that enhances phase estimation. The DSU(1,1) shows improved phase sensitivity and quantum Fisher information, even with photon losses.

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Last Updated: Jul 8, 2025

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Area of Science:

Quantum optics
Quantum metrology

Background:

SU(1,1) interferometers are crucial for quantum-enhanced measurements.
Phase sensitivity and quantum Fisher information (QFI) are key metrics for estimation performance.

Purpose of the Study:

To investigate the impact of local displacement operations (LDOs) on SU(1,1) interferometers.
To analyze phase sensitivity and QFI in a displacement-assisted SU(1,1) [DSU(1,1)] interferometer.
To assess the performance and robustness of the DSU(1,1) under realistic conditions, including photon losses.

Main Methods:

Implementation of two local displacement operations (LDOs) within an SU(1,1) interferometer.
Utilizing homodyne detection for phase sensitivity measurements.
Calculating quantum Fisher information (QFI) with and without photon losses.

Main Results:

The DSU(1,1) interferometer consistently outperforms the standard SU(1,1) interferometer in estimation performance.
Phase precision in the DSU(1,1) approaches the Heisenberg limit with increased LDO strength.
The DSU(1,1) exhibits enhanced robustness against photon losses through controlled LDOs.

Conclusions:

Local displacement operations significantly improve phase estimation in SU(1,1) interferometers.
The DSU(1,1) offers superior phase sensitivity and QFI, demonstrating robustness in realistic scenarios.
This work provides a valuable framework for advancing quantum-enhanced phase estimation in optical interferometers.