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Superconductive nanowire single-photon detector capable of distinguishing photon number and preparation method thereof

A single-photon detector and superconducting nanowire technology, applied in the field of single-photon detection, can solve the problems of huge readout circuit, limited quantum efficiency and the highest number of resolvable photons, and achieve high quantum efficiency, low dark count, high The effect of count rate

Active Publication Date: 2012-02-15
TSINGHUA UNIV
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Problems solved by technology

However, the SNSPD array requires a very large and complex readout circuit, because each SNSPD unit requires a separate amplifier, bias circuit, and discriminator
Although PND does not require such a complicated readout circuit, the leakage current has become its fatal flaw, which seriously limits its quantum efficiency and the highest number of resolvable photons.

Method used

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  • Superconductive nanowire single-photon detector capable of distinguishing photon number and preparation method thereof
  • Superconductive nanowire single-photon detector capable of distinguishing photon number and preparation method thereof
  • Superconductive nanowire single-photon detector capable of distinguishing photon number and preparation method thereof

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 1 As shown, it is a superconducting nanowire single-photon detector capable of distinguishing the number of photons, which is composed of 4 superconducting nanowires in series and corresponding 4 shunt resistors. A shunt resistor is arranged between them, the superconducting nanowire is made of niobium nitride, and the shunt resistor is made of gold film. The working principle of each unit is basically the same as that of the traditional SNSPD, which is based on the principle of Cooper pair destruction and heat island (hotspot) generation caused by the absorption of photons.

[0023] Such as figure 2 As shown, each section of superconducting nanowire in the device can be equivalent to an inductor and a variable resistor, where the inductance value is determined by the dynamic inductance of the corresponding section of ...

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Abstract

The invention provides a superconductive nanowire single-photon detector capable of distinguishing photon number. The superconductive nanowire single-photon detector consists of N superconductive nanowires which are connected in series and corresponding N bypass resistors, wherein each bypass resistor is arranged between every two adjacent superconductive nanowires; the superconductive nanowires are made from superconductive materials such as niobium nitride or titanium niobium nitride and the like; and the bypass resistors are made from metal films such as gold or titanium and the like. The invention further provides a method for preparing the superconductive nanowire single-photon detector. The prepared superconductive nanowire single-proton detector has high quantum efficiency, high counting efficiency, low dark count and capability of distinguishing photon number, and is not influenced by leakage current.

Description

technical field [0001] The invention belongs to the field of single-photon detection, is suitable for single-photon detection that needs to realize photon number resolution in visible light and infrared bands, and relates to a superconducting nanowire single-photon detector capable of resolving photon numbers and a preparation method. Background technique [0002] In recent years, single-photon detection technology has been widely demanded and applied in advanced optical imaging, spectroscopy, high-energy physics, ultra-fast space satellite communication, radiation detection and quantum information. G.N.Gol'tsman et al., "Picosecond superconducting single-photon optical detector," Applied Physics Letter, vol.79, pp.705-707, 2001. Documented superconducting nanowire single-photon detector (SNSPD) since its Since its birth, it has attracted people's attention due to its excellent single-photon detection ability in the visible and infrared bands, ultra-high count rate, low dark...

Claims

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Application Information

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IPC IPC(8): G01J11/00B81C1/00
Inventor 成日盛刘建设李铁夫陈炜
Owner TSINGHUA UNIV
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