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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Time-tagged coincidence counting unit for large-scale photonic quantum computing.

Wei Li1, Yi Hu1, Han-Sen Zhong1

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

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|November 8, 2018
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We developed a real-time time-tagged coincidence method for photonic quantum computing. This scalable solution overcomes challenges in high channel number and counting rate experiments, offering a versatile tool for quantum applications.

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Area of Science:

  • Quantum Information Science
  • Photonics
  • Computer Engineering

Background:

  • Real-time single-photon coincidence analysis is crucial for photonic quantum computing.
  • Conventional methods struggle with the high channel counts and data rates of advanced quantum experiments.

Purpose of the Study:

  • To propose and demonstrate a novel real-time time-tagged coincidence method.
  • To address the limitations of existing instruments for large-scale photonic quantum applications.

Main Methods:

  • Implementation of a 32-channel coincidence counting unit on a field-programmable gate array (FPGA).
  • Development of a real-time data filtering solution for high-throughput coincidence detection.
  • Characterization of the unit's performance, including counting rates and timing resolution.

Main Results:

  • Successful implementation of a 32-channel real-time coincidence counting unit.
  • Achieved high counting rates and a timing resolution of 390 ps.
  • Demonstrated scalability to 104 channels, suitable for demanding applications like boson sampling.

Conclusions:

  • The proposed real-time time-tagged coincidence method offers a scalable and versatile solution.
  • The developed FPGA-based unit is well-suited for high-channel-count photonic quantum computing applications.
  • This represents a turn-key solution for advanced single-photon coincidence counting needs.