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Multichannel SNSPD system with high detection efficiency at telecommunication wavelength.

Shigehito Miki1, Taro Yamashita, Mikio Fujiwara

  • 1Kobe Advanced Research Center, National Institute of Information and Communications Technology, 588-2, Iwaoka, Iwaoka-cho, Nishi-ku, Kobe, Hyogo 651-2492, Japan. s-miki@nict.go.jp

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|July 3, 2010
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Summary

We created a four-channel superconducting nanowire single-photon detector using a cryocooler. This system achieves high detection efficiency (DE) over 16% at 1550 nm, with the best channel reaching 30% DE at 1310 nm.

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Area of Science:

  • Quantum optics
  • Superconducting devices
  • Photon detection

Background:

  • Single-photon detectors are crucial for quantum information processing and sensitive measurements.
  • Superconducting nanowire single-photon detectors (SNSPDs) offer high efficiency and low noise.

Purpose of the Study:

  • To develop and characterize a multi-channel SNSPD system for practical applications.
  • To evaluate the system's performance using a Gifford-McMahon cryocooler.

Main Methods:

  • Fabrication of a four-channel superconducting nanowire single-photon detector array.
  • Integration of the detector array with a Gifford-McMahon cryocooler.
  • System characterization including detection efficiency and dark count rate measurements at 1550 nm and 1310 nm wavelengths.

Main Results:

  • All four channels demonstrated a system detection efficiency (DE) exceeding 16% at 1550 nm with a 100 Hz dark-count rate.
  • The optimal channel achieved a system DE of 21% at 1550 nm and 30% at 1310 nm.
  • The Gifford-McMahon cryocooler provided stable operation for the multi-channel SNSPD system.

Conclusions:

  • The developed four-channel SNSPD system offers high performance and stability.
  • The system is suitable for applications requiring efficient single-photon detection at telecom wavelengths.
  • This work demonstrates a practical approach to multi-channel SNSPD integration with cryocooler technology.