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Related Experiment Video

Updated: Jun 13, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Photon-number correlations by photon-number resolving detectors.

Alessia Allevi¹, Maria Bondani, Alessandra Andreoni

¹CNISM, U.d.R. Milano, I-20133, Italy.

|May 19, 2010

Summary

Researchers quantified photon-number correlations in mesoscopic light states using internal gain photodetectors. This method accurately measures shot-noise levels without corrections, outperforming traditional silicon photon counters.

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Area of Science:

Quantum Optics
Photon Detection
Quantum Information Science

Background:

Quantifying photon statistics in bipartite states is crucial for quantum optics and information.
Existing methods for measuring photon-number correlations can be limited by detector noise and require complex corrections.
The mesoscopic regime, with fewer than 100 mean photons, presents unique challenges for precise photon counting.

Purpose of the Study:

To demonstrate a novel method for quantifying photon-number correlation coefficients in pulsed bipartite states.
To evaluate the performance of photodetectors with internal gain in the mesoscopic intensity regime.
To compare these novel detectors against multipixel silicon photon counters for noise and accuracy.

Main Methods:

Utilized pairs of photodetectors featuring internal gain for enhanced sensitivity.
Measured the photon-number correlation coefficient for pulsed bipartite light states.
Compared the performance of hybrid photoemissive detectors with multipixel silicon photon counters.

Main Results:

Successfully quantified photon-number correlations in the mesoscopic regime ( < 100 mean photons).
Photodetectors with internal gain enabled direct evaluation of the variance in photon number differences.
The absence of significant noise in these detectors allowed for accurate shot-noise level determination without corrections.

Conclusions:

Photodetectors with internal gain offer a robust and accurate method for characterizing photon correlations.
This technique simplifies the measurement of shot-noise levels in mesoscopic quantum states.
Hybrid photoemissive detectors show superior performance over silicon photon counters in this application due to lower noise.