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Single-Photon Single-Flux Coupled Detectors.

Murat Onen1,2, Marco Turchetti1,2, Brenden A Butters1,2

  • 1Department of Electrical Engineering and Computer Science , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

Nano Letters
|December 19, 2019
PubMed
Summary

This study introduces a new device combining a single-photon detector with superconducting memory for accurate photon counting. It converts single photons into measurable flux changes, enabling precise detection and differentiation from other signals.

Keywords:
SNSPDSingle-photon detectorssingle-flux quantum electronicssuperconducting devices

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Area of Science:

  • Quantum optics and superconducting electronics.
  • Development of novel single-photon detection technologies.

Background:

  • Superconducting nanowire single-photon detectors (SNSPDs) are crucial for quantum information processing.
  • Superconducting memories offer potential for high-speed, low-power data storage.

Purpose of the Study:

  • To present a novel integrated device combining SNSPD and superconducting multilevel memory.
  • To demonstrate single-photon counting capabilities via single-flux quantum conversion.
  • To characterize and optimize the device for differentiating single-photon events.

Main Methods:

  • Fabrication of a hybrid superconducting device integrating SNSPD and multilevel memory.
  • Electrical characterization to verify single-flux quantum (SFQ) separated memory states.
  • Optical measurements using attenuated laser pulses to assess detection accuracy and distinguish photon events.

Main Results:

  • Successful integration of SNSPD and superconducting memory demonstrated.
  • Single-photon detection was reliably converted into SFQ states for counting.
  • Optical measurements confirmed the device's ability to differentiate single-photon events from multiphoton and thermal effects.

Conclusions:

  • The novel hybrid device enables accurate single-photon counting using SFQ conversion.
  • This technology holds promise for advanced quantum detection and memory applications.
  • Further optimization of geometry and materials can enhance device performance.