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Fully-integrated high-speed single photon detecting system and detecting method

A single-photon detection and detection system technology, applied in instruments and other directions, can solve problems such as limiting the performance of detectors and application systems, and achieve the effects of avoiding false identification events, suppressing pulse effects, and reducing dark counts

Active Publication Date: 2012-09-05
张军
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Problems solved by technology

However, due to technical limitations, the operating frequency of traditional single-photon detectors is usually on the order of MHz, and the highest does not exceed 20 MHz, which severely limits the performance of detectors and application systems

Method used

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  • Fully-integrated high-speed single photon detecting system and detecting method
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  • Fully-integrated high-speed single photon detecting system and detecting method

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Embodiment Construction

[0013] A fully integrated high-speed single-photon detection system includes a precision clock source V1, which is realized by a high-stability voltage-controlled crystal oscillator and a phase-locked loop circuit, and provides a gated clock signal and a system synchronization signal. The output terminal of the precision clock source V1 is respectively connected to the input terminal of the input filtering and amplification module 1, and the input terminal of the voltage-controlled phase shifter S1. The count rate of the detection system is always kept at the highest value. The output end of the input filtering and amplification module 1 is connected to the temperature control module 2, and the avalanche photodiode APD and the low-noise DC bias power supply P1 are packaged in the temperature control module 2, and the temperature of the temperature control module 2 can be controlled by the user. The temperature control module 2 is connected to the input end of the output filter...

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Abstract

The invention relates to a fully-integrated high-speed single photon detecting system, comprising a precision clock source V1, wherein an output end of the precision clock source V1 is connected with an input end of an input filtering and amplifying module; an output end of the input filtering and amplifying module is connected with a temperature control module; an avalanche photodiode (APD) and a low noise direct current bias supply P1 are packaged in the temperature control module which is connected with an input end of an output filtering and amplifying module by a directional coupler; andan output end of the output filtering and amplifying module is connected with a counting module by a screening coincidence and dead time setting module. The invention also discloses a detecting method of the fully-integrated high-speed single photon detecting system. The fully-integrated high-speed single photon detecting system can strictly inhibit a back pulse effect, has a working frequency of 2 GHz and a counting rate of 100 MHz, is especially suitable for a quantum cryptographic system.

Description

technical field [0001] The invention mainly relates to quantum communication, quantum cryptography and other fields that require extremely weak light detection, and specifically relates to a fully integrated high-speed single-photon detection system and a detection method thereof. Background technique [0002] Single photon detector is the main tool for ultra-weak light detection, and has a wide range of applications in many fields. The basic working principle of the single photon detector is: the avalanche photodiode APD works in the Geiger mode, that is, the reverse bias voltage of the avalanche diode exceeds the avalanche voltage of the diode. When a single incident photon is absorbed, a pair of carriers will be generated. Due to the impact ionization effect, the carriers will form an avalanche effect and finally output a macroscopic current. The quenching circuit at the back end will reset the circuit to The initial state is used to detect the next photon and output the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 张军
Owner 张军
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