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Room-Temperature Single-Photon Detector Based on Single Nanowire.

Wenjin Luo1,2,3, Qianchun Weng1,3, Mingsheng Long1,3

  • 1State Key Laboratory of Infrared Physics , Shanghai Institute of Technical Physics, Chinese Academy of Sciences , Shanghai 200083 , China.

Nano Letters
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Summary
This summary is machine-generated.

Researchers developed a room-temperature photon-number-resolving detector using nanowires. This device can distinguish single photons and shows potential for quantum information technologies.

Keywords:
Single-photon detectorsphoton-number-resolving capabilitypolarization sensitivityroom-temperature operation

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Area of Science:

  • Quantum Information Science
  • Nanotechnology
  • Photonics

Background:

  • Single-photon detectors are crucial for quantum technologies.
  • Existing photon-number-resolving detectors struggle with room-temperature operation.
  • Limited options exist for distinguishing photon numbers at ambient temperatures.

Purpose of the Study:

  • To demonstrate a room-temperature photon-number-resolving detector.
  • To leverage field-effect transistor and nanowire integration for enhanced detection.
  • To overcome limitations of current single-photon detection technologies.

Main Methods:

  • Integrated a field-effect transistor configuration with core/shell nanowires.
  • Utilized the shell as a photosensitive gate to induce persistent photocurrent.
  • Operated the detector at room temperature for photon number resolution.

Main Results:

  • Successfully resolved 1, 2, and 3 photon-number states with >82% confidence at room temperature.
  • Achieved a detection efficiency of 23% and a dark count rate of 1.87 × 10⁻³ Hz.
  • Demonstrated intrinsic photon-polarization selection due to the nanowire's anisotropic nature.

Conclusions:

  • The developed nanowire-based detector offers room-temperature photon-number resolution.
  • The device exhibits unique polarization sensitivity, differentiating it from intensity-based detectors.
  • This technology holds significant promise for future single-photon detection applications in quantum information.