Low-temperature reading method of superconducting nanowire single-photon detector

Abstract

The invention discloses a low-temperature reading method of a superconducting nanowire single-photon detector. The method involves a high input impedance amplification circuit at low temperature, a device base and a bias plate, wherein the high input impedance amplification circuit enters a room temperature environment through a coaxial line; the superconducting nanowire single-photon detector atlow temperature is connected with the bias plate through a bonding line; the bias plate is connected to a current source in the room temperature environment through a pin header and a direct current line; the superconducting nanowire single-photon detector is placed on the device base; and an output end of the superconducting nanowire single-photon detector is connected to an input end of the highinput impedance amplification circuit through the bonding line. The method solves the problems of weak detection signals of the superconducting nanowire single-photon detector, impedance mismatch andenergy loss caused by the traditional 50 omega room temperature reading method, effectively improves the pulse amplitude and the signal-to-noise ratio of output signals of the device, and particularly realizes photon number resolution for a serial SNSPD device.

Description

technical field [0001] The invention relates to a low-temperature readout method, in particular to a low-temperature readout method suitable for superconducting nanowire single-photon detectors. Background technique [0002] Superconducting nanowire single photon detectors (SNSPDs) achieve efficiencies as high as 93% and dark counts as low as 10 -4 the s -1 , the maximum count rate is up to 100MHz, the time jitter is as low as 16ps, and the response spectrum is from visible light to infrared, which has obvious advantages compared with other single photon detectors. Developing SNSPD arrays to achieve photon number resolution, time resolution and space resolution is a major trend in the development of SNSPDs. However, SNSPD usually works in a strong nonlinear mode. Even if multiple photons are absorbed at the same time, only one pulse signal is generated. , not only need to respond to the incident photons, but also need to distinguish the number of incident photons, and eve...

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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 superconducting nanowire single photon detectors, which solves the problem of weak detection signals of superconducting nanowire single photon detectors. , Impedance mismatch and energy loss problems caused by the traditional 50Ω room temperature readout method, improve the pulse amplitude and signal-to-noise ratio of the device output signal, especially for series SNSPD devices, can achieve photon number resolution

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