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Area of Science:

  • Quantum optics and photonics
  • Superconducting device physics

Background:

  • Single-photon detection is crucial for quantum science, dark matter research, and biomedical imaging.
  • Superconducting nanowire single-photon detectors (SNSPDs) offer high efficiency and low noise but are limited by current crowding in their bends.
  • Current crowding degrades SNSPD performance metrics like detection efficiency and timing jitter.

Purpose of the Study:

  • To mitigate performance limitations in SNSPDs caused by current crowding.
  • To enhance SNSPD sensitivity and reduce dark count rates through targeted irradiation.
  • To enable efficient single-photon detection with improved operational parameters.

Main Methods:

  • Developed a localized helium ion irradiation technique for SNSPDs.
  • Irradiated only the straight segments of meander-shaped SNSPDs, leaving the bends unirradiated.
  • Quantified performance improvements by measuring saturation plateau width, internal detection efficiency, and dark count rate.

Main Results:

  • Locally irradiated SNSPDs exhibited a relative saturation plateau width of 37%, significantly higher than fully irradiated detectors (10%).
  • This wider plateau allows operation at lower bias currents, reducing dark count rates while maintaining high detection efficiency.
  • Achieved an internal detection efficiency of 94% with a dark count rate of 7 mHz at 780 nm.

Conclusions:

  • Localized irradiation is an effective strategy to overcome current crowding in SNSPDs.
  • The developed method enhances SNSPD sensitivity and reduces dark count rates, improving detector performance.
  • These current crowding-free SNSPDs are well-suited for demanding applications requiring precise single-photon detection.