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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Continuous-variable entanglement measurement using an unbalanced Mach-Zehnder interferometer.

Chuanqing Xia, Dong Wang, Yang Wu

|March 14, 2015

Summary

Researchers developed a simple interferometer to measure entangled quantum beams. This method directly quantifies amplitude and phase correlations below the shot noise limit for quantum measurement applications.

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Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

Quantum optics
Quantum information science

Background:

Entangled beams are crucial for quantum technologies.
Direct measurement of quantum correlations is challenging.

Purpose of the Study:

To propose and demonstrate a simple method for directly measuring entangled beams.
To simultaneously measure amplitude quadrature correlations and phase quadrature anticorrelations.

Main Methods:

Utilized an unbalanced Mach-Zehnder interferometer.
Employed two optical fibers of different lengths (2 m and 50 m).
Used a nondegenerate optical parametric amplifier to generate entangled beams.

Main Results:

Achieved direct measurement of entangled beams.
Measured correlation variances below the shot noise limit: 1.79 dB for amplitude difference and 1.62 dB for phase sum.
Demonstrated simultaneous measurement of these correlations.

Conclusions:

The proposed scheme offers a simple and convenient method for measuring entangled beams.
This technique has potential applications in advanced quantum measurements and quantum sensing.