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Related Experiment Video

Updated: Mar 11, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

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48-channel coincidence counting system for multiphoton experiment.

Chen Zhang1, Wei Li1, Yi Hu1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

The Review of Scientific Instruments
|December 3, 2016
PubMed
Summary

This study presents a 48-channel coincidence counting system for multiphoton experiments. The system precisely counts multi-photon coincidence events, crucial for advanced quantum entanglement research.

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Area of Science:

  • Quantum Optics
  • Experimental Physics
  • Photonics

Background:

  • Multiphoton experiments require precise detection and counting of entangled photons.
  • Existing systems may face limitations in channel count and event complexity.

Purpose of the Study:

  • To develop and demonstrate a high-channel-count coincidence counting system for multiphoton experiments.
  • To enable the analysis of complex coincidence events in multi-photon entanglement studies.

Main Methods:

  • Implemented a 48-channel coincidence counting system utilizing Field Programmable Gate Arrays (FPGAs).
  • Employed dynamic delay adjustment for signal alignment and clock phase shifting for pulse sampling.
  • Utilized logic constraints for pulse width stabilization and external RAM for data storage.

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Related Experiment Videos

Last Updated: Mar 11, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

9.0K
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Main Results:

  • Successfully demonstrated a coincidence counting system capable of handling up to 531,441 distinct coincidence event types.
  • Achieved precise alignment and stable pulse width for 48 input photon signals.
  • Enabled the analysis of 2-, 3-, 4-, 5-, and 6-fold coincidence events.

Conclusions:

  • The developed system is suitable for multiphoton entanglement experiments involving multiple degrees of freedom.
  • This high-channel-count system advances the capabilities for analyzing complex quantum phenomena.