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

A technology of single-photon detectors and superconducting nanowires, which is applied in the direction of using electric radiation detectors for photometry and measurement circuits, and can solve the problems of multi-channel detectors with many output ports, weak anti-interference ability, weak detection signals, etc. problem, to achieve the effect of avoiding environmental noise, strong anti-magnetic and simple structure

Active Publication Date: 2021-06-08
NANJING UNIV
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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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  • A low-temperature readout method for multi-channel superconducting nanowire single-photon detectors
  • A low-temperature readout method for multi-channel superconducting nanowire single-photon detectors
  • A low-temperature readout method for multi-channel superconducting nanowire single-photon detectors

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Embodiment

[0023] Example: The multi-channel superconducting nanowire single-photon detector and superconducting nanowire encoder are loaded in a 1.5K refrigerator, and the installation process of the circuit is introduced. Such as figure 1 As shown, at first, the multi-channel superconducting nanowire single photon detector (this embodiment takes seven as an example) and three superconducting nanowire encoders are connected at low temperature, and according to figure 1 The connection methods shown in are coupled to each other. At low temperature, the superconducting nanowire encoder encodes the detection signal of each superconducting nanowire single photon detector and performs signal amplification once to convert the original signal into three encoded signals. Secondly, the three superconducting nanowire encoders are output to room temperature through the SMA interface and the coaxial line, and then the output signals of the three channels are amplified again through three amplifiers...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/44
Inventor 郑凯赵清源康琳
Owner NANJING UNIV
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