Near-infrared band low-noise free-running single-photon detector

A single-photon detector, ultra-low noise technology, applied in the field of single-photon detection, can solve the problem of large noise, achieve the effect of minimizing parasitic capacitance, suppressing the after-pulse effect, and reducing the after-pulse probability

Inactive Publication Date: 2017-06-20
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

However, existing avalanche photodiode free-running single-photon detectors are difficult to use in practical applications because of the huge noise (including dark count and afterpulse)

Method used

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  • Near-infrared band low-noise free-running single-photon detector

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] figure 1 A schematic structural diagram of an ultra-low-noise free-running single-photon detector in the near-infrared band provided by an embodiment of the present invention. Such as figure 1 As shown, it mainly includes: a negative feedback avalanche photodiode (NFAD) and its peripheral circuit, a refrigeration box 1, a discrimination module 2, a dead time setting module 4, a temperature adjustment module 5, and an FPGA3; wherein:

[002...

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Abstract

The invention discloses a near-infrared band low-noise free-running single-photon detector, and the detector comprises a negative feedback avalanche photodiode (NFAD), a peripheral circuit of the NFAD, a refrigeration box, a discrimination module, a dead time setting module, a temperature adjustment module and an FPGA; The NFAD and the peripheral circuit are respectively connected with the FPGA through the discrimination module and the dead time setting module. The discrimination module is used for converting an avalanche signal into an electrical level signal and transmitting the electrical level signal to the FPGA. The dead time setting module is used for reducing the bias voltage of the NFAD below an avalanche voltage. The NFAD and the peripheral circuit are packaged in the refrigeration box, and the refrigeration box is connected with the FPGA through the temperature adjustment module. According to the scheme of the invention, the detector carries out the deep refrigeration of the NFAD through a Stirling refrigerator, thereby reducing the dark count of the detector. The post-pulse probability of the detector is effectively inhibited through integrating a single thin resistor in a detector part and setting the dead time after each detection event.

Description

technical field [0001] The invention relates to the technical field of single-photon detection, in particular to a near-infrared band ultra-low noise free-running single-photon detector. Background technique [0002] Single photon detectors in the near-infrared band are essential tools for ultra-weak light detection in this band, and are widely used in quantum communication, quantum information science, optical time domain reflectometer, single-photon radar and other fields. According to the arrival time of the single photon signal, it is divided into a gated mode and a free running mode. When the single photon signal is periodic or its arrival time is known, the gated working mode can be used. When the single-photon signal is aperiodic and the arrival time cannot be accurately known, the single-photon detector must work in a free-running mode. [0003] Currently, free-running single-photon detectors in the near-infrared band mainly include superconducting single-photon det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 张军余超刘乃乐潘建伟
Owner UNIV OF SCI & TECH OF CHINA
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