Superconducting nanowire single photon detection system provided with impedance matching transmission line

Abstract

The invention provides a superconducting nanowire single photon detection system provided with an impedance matching transmission line. The system comprises a superconducting nanowire single photon detector (SNSPD), the 1/4 wavelength impedance matching transmission line, a high-pass filter, a three-port device, a current source and an amplifier, wherein one end of the 1/4 wavelength impedance matching transmission line is connected with the SNSPD; one end of the high-pass filter is connected with the end, connected to the SNSPD, of the 1/4 wavelength impedance matching transmission line, andthe other end of the high-pass filter is grounded; a first port of the three-port device is connected with the end, away from the SNSPD, of the 1/4 wavelength impedance matching transmission line; oneend of the current source is connected with a second port of the three-port device; and the input end of the amplifier is connected with a third port of the three-port device, and the grounded end ofthe amplifier is grounded. Through the system, matching reading of a specific frequency signal can be realized, amplification of a pulse amplitude is realized; and time jitter is lowered; and low-frequency components in the signal can be shaped and removed, so that the counting rate and detection rate are increased.

Description

technical field [0001] The invention belongs to the technical field of light detection, in particular to a superconducting nanowire single-photon detection system with an impedance matching transmission line. Background technique [0002] Superconducting nanowire single photon detector (SNSPD) is a new type of single photon detection technology developed in the past ten years. Its biggest advantage over semiconductor detectors is its ultra-high detection efficiency and fast response. speed, negligible dark counts, and extremely low timing jitter with a spectral response spanning visible to infrared. In 2001, the Gol'tsman group of Moscow Normal University first prepared a 200nm-wide superconducting nanowire by using a 5nm-thick NbN ultra-thin film, successfully realized single-photon detection from visible light to near-infrared, and opened the single-photon detection of superconducting nanowires. The first of its kind in photon detectors. Since then, many countries and re...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a superconducting nanowire single-photon detection system with an impedance matching transmission line, which is used to solve the problems existing in the superconducting nanowire single-photon detection system in the prior art. Problems such as high time jitter, low count rate, etc., as well as problems such as reduced signal-to-noise ratio, difficulty in device characterization, and system complexity

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