A low-temperature readout method for multi-channel superconducting nanowire single-photon detectors

Abstract

The invention discloses a low-temperature readout method for a multi-channel superconducting nanowire single-photon detector or a detector array, which includes a superconducting nanowire single-photon detector and a superconducting nanowire three-terminal logic device with multiple gate terminals composed of a superconducting nanowire encoder, and then to the coaxial line and radio frequency amplification circuit of the external detection instrument; the output signal of the superconducting nanowire encoder is transmitted from the low temperature working area to the room temperature environment through the coaxial line; the superconducting The conductive nanowire encoder has (2 N -1) inputs and N outputs. The invention solves the limitations of weak detection signal of the superconducting nanowire single photon detector, too many output ports of the multi-channel detector or detector array, weak anti-interference ability, and large noise of the traditional room temperature readout method, and effectively improves the Detector stability.

Description

technical field [0001] The invention relates to a low-temperature readout method, in particular to a low-temperature readout method suitable for multi-channel superconducting nanowire single-photon detectors. Background technique [0002] Superconducting nanowire single-photon detector (superconducting-nanowire single-photon detector, SNSPD) is a new type of single-photon detector. The photosensitive part of the superconducting nanowire single photon detector is composed of nanowires prepared from superconducting thin films, such as niobium nitride thin films. Superconducting nanowire single photon detectors need to be biased below the superconducting critical current when they work. When the nanowire absorbs photons, the superconducting state in the absorbing region is destroyed, which is manifested in the circuit as a sudden drop in the current flowing through the detector. The nanowires then undergo a cooling process to return to their original state. The process of ph...

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Problems solved by technology

[0005] Purpose of the invention: In view of the problems and deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a low-temperature readout method for multi-channel superconducting nanowire single photon detectors, which solves the problem of detection of superconducting nanowire single photon detectors. Weak signal, too many output ports of multi-channel detectors, weak anti-interference ability, and large noise limitations of traditional room temperature readout methods effectively improve the working stability of the detector

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