High-efficiency WSi superconducting nanowire single-photon detectors operating at 2.5 K

Abstract

We investigate the operation of WSi superconducting nanowire single-photon detectors (SNSPDs) at 2.5 K, a temperature which is ~ 70 % of the superconducting transition temperature (TC) of 3.4 K. We demonstrate saturation of the system detection efficiency at 78 +- 2 % with a jitter of 191 ps. We find that the jitter at 2.5 K is limited by the noise of the readout, and can be improved through the use of cryogenic amplifiers. Operation of SNSPDs with high efficiency at temperatures very close to TC appears to be a unique property of amorphous WSi.

Cited by in corpus (12)

• Silicon Quantum Photonics
• A Near-Infrared 64-pixel Superconducting Nanowire Single Photon Detector Array with Integrated Multiplexed Readout
• UV superconducting nanowire single-photon detectors with high efficiency, low noise, and 4 K operating temperature
• Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection
• Superconducting single-photon detectors with saturated dependence of quantum efficiency vs. bias current
• Physical mechanisms of timing jitter in photon detection by current carrying superconducting nanowires
• Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre Network
• High-efficiency WSi superconducting nanowire single-photon detectors for quantum state engineering in the near infrared
• Storage of hyperentanglement in a solid-state quantum memory
• Superconducting nanowire single-photon detectors fabricated from atomic-layer-deposited NbN
• Inhomogeneous critical current in nanowire superconducting single-photon detectors
• Comparing different approaches for generating random numbers device-independently using a photon pair source