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Superconducting nanowire single-photon detector array capable of distinguishing photon energy

A single-photon detector and superconducting nanowire technology, which is applied to superconductor components and instruments, can solve the problem of not having the ability to distinguish different photon energies or light wavelengths, solve the problem of multi-channel cooperative work, and broaden the application range effect

Inactive Publication Date: 2020-01-17
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a superconducting nanowire single-photon detector array capable of resolving photon energy, which solves the problem of traditional superconducting nanowire single-photon detection by integrating superconducting nanowire single-photon detectors, optical fibers and wavelength division multiplexers Due to the limitations of certain applications such as quantum key distribution systems due to the lack of the ability to distinguish different photon energies or light wavelengths, this invention has the ability to distinguish photon energies and can be applied to wavelength division multiplexing quantum encryption In the key distribution system, see the following description for details:

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  • Superconducting nanowire single-photon detector array capable of distinguishing photon energy
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  • Superconducting nanowire single-photon detector array capable of distinguishing photon energy

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Embodiment 1

[0035] Embodiment 1 The overall technical scheme of the invention is as figure 1 Shown: a beam of broad-spectrum light is incident from the left end of the fiber, and after passing through the fiber wavelength division multiplexer, light with different photon energy (wavelength) is output from different fiber channels (fiber channel 1.....fiber channel n) on the right end , And connected to a cryostat; in the cryostat, a superconducting nanowire single-photon detector is printed on the terminal end of each optical fiber. The superconducting nanowire single-photon detector covers the fiber core, and the anode and cathode are set on the fiber On the end face of the cladding layer, the readout cable is connected with the positive electrode and the negative electrode; the superconducting nanometer single photon detector is connected in the bias and readout circuit to read the photon count rate.

[0036] Therefore, a superconducting nanowire single-photon detector array capable of dist...

Embodiment approach

[0050] The best implementation plan is as follows:

[0051] 1. Processing superconducting nanowire single-photon detectors based on thin films

[0052] A layer of silicon nitride with a certain thickness is grown by plasma enhanced chemical vapor deposition, and a layer of superconducting film material with a certain thickness is sputtered on the silicon nitride by magnetron sputtering, and gold is processed on the superconducting film electrode;

[0053] Transfer the nanowire pattern to the electron beam exposure glue through the electron beam exposure method, use the electron beam exposure glue as a mask, and etch the nanowire pattern by the reactive ion beam etching method;

[0054] The etching window is opened by photolithography, the silicon is etched and the superconducting nanowire single-photon detector is removed from the film, and the silicon substrate is plated with silver.

[0055] 2. Make a titanium gold electrode on the fiber end face on the right side of the wavelength d...

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Abstract

The invention discloses a superconducting nanowire single-photon detector array capable of distinguishing photon energy. The superconducting nanowire single-photon detector array comprises a beam of broad-spectrum light is irradiated from an optical fiber at a left end, the light with different photon energy is output from different optical fiber channels at a right end after passing through an optical fiber wavelength division multiplexer and is accessed to a cryostat; a superconducting nanowire single-photon detector is transferred on a terminal end face of each optical fiber in the cryostat, the single-photon detector covers an optical fiber core, a positive electrode and a negative electrode are arranged on the end face of optical fiber cladding, and a readout cable is connected withthe positive electrode and the negative electrode; and the superconducting nanowire single-photon detector is connected in a bias and readout circuit to read out a photon counting rate. The superconducting nanowire single-photon detector array disclosed by the invention has photon energy distinguishing ability and can be applied to a wavelength division multiplexing quantum key distribution system.

Description

Technical field [0001] The invention relates to the field of optoelectronic devices, in particular to a superconducting nanowire single-photon detector array capable of distinguishing photon energy. Background technique [0002] The superconducting nanowire single photon detector (SNSPD) has the advantages of high detection efficiency, high count rate, low dark count rate, low time-domain jitter, and wide response spectrum. It is indispensable in today's near-infrared and visible light band quantum optics experiments Experimental instrument. It utilizes the transition characteristics of superconducting nanowires from a superconducting state to a resistive state under single photon excitation, converting optical signals into voltage signals and reading them out by a readout circuit, and realizing photon counting by counting the voltage signals. [0003] Nowadays, traditional superconducting nanowire single-photon detectors can only detect the number of single photons, but cannot di...

Claims

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Application Information

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IPC IPC(8): G01J11/00H01L39/10
CPCG01J11/00H10N60/84
Inventor 胡小龙邹锴孟赟王昭胡南许亮兰潇健曹许慧
Owner TIANJIN UNIV
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