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Single-photon detection using large-scale high-temperature MgB2 sensors at 20 K.

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Superconducting magnesium diboride (MgB2) microwires achieve single-photon detection at 1.55 μm. These detectors operate up to 20 K, offering fast reset times and high count rates for advanced applications.

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Superconductivity

Background:

  • Single-photon detectors are crucial for quantum communication, cryogenics, and medical imaging.
  • Existing detectors often face limitations in operating temperature, speed, and scalability.
  • Magnesium diboride (MgB2) is a promising material for superconducting applications.

Purpose of the Study:

  • To demonstrate MgB2 thin-film superconducting microwires for single-photon detection.
  • To investigate the performance characteristics of these detectors, including sensitivity, efficiency, and speed.
  • To explore the potential for high-temperature operation and large-area detectors.

Main Methods:

  • Fabrication of MgB2 thin-film superconducting microwires.
  • Modification of MgB2 properties using helium ion irradiation.
  • Characterization of single-photon detection capabilities at 1.55 μm wavelength.
  • Measurement of detector performance metrics such as operating temperature, detection efficiency, linearity, and reset time.

Main Results:

  • MgB2 microwire detectors exhibit single-photon sensitivity at 1.55 μm.
  • Detectors show sensitivity up to 20 K, with efficiency saturation at 3.7 K for 1 μm wide microwires.
  • Linearity of detection rate versus incident power is maintained up to 100 Mcps.
  • Fast reset times of approximately 1 ns are achieved for large active areas (up to 400 × 400 μm²).

Conclusions:

  • MgB2 thin-film superconducting microwires are viable for single-photon detection.
  • These detectors offer potential for overcoming operating temperature and count rate limitations.
  • The findings open possibilities for expanded detector areas and further research into fundamental detection mechanisms in high-critical-temperature superconductors.