Single photon detection device and single photon detection method

By using extremely narrow band bandpass filters and interference units in a single photon detection device, the problem of the capacitance response of the gated signal is solved, and efficient single photon detection and signal-to-noise ratio improvement are achieved.

CN115235620BActive Publication Date: 2025-03-18BEIJING ACAD OF QUANTUM INFORMATION SCI
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Patent Information

Application Number
CN202210862132.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-20
Publication Date
2025-03-18
Estimated Expiration
2042-07-20

AI Technical Summary

Technical Problem

In the existing single-photon detection device, the parasitic capacitance of the avalanche photodiode and the circuit causes the capacitance of the gated signal to mask the avalanche signal caused by the photon, affecting the detection efficiency and signal-to-noise ratio.

Method used

A single photon detection device including an interference unit is adopted to obtain the fundamental or higher harmonic signal frequency components of the gated interference signal through an extremely narrow band bandpass filter filter, and interfere with the main transmission signal through a coupling module to effectively eliminate the interference signal.

Benefits of technology

Effective elimination of gated interference signals is achieved, the detection efficiency and signal-to-noise ratio of the single-photon detection device are improved, and the post-pulse effect and jitter are reduced.

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Abstract

The present invention discloses a single-photon detection device including an interference unit, wherein the interference unit includes: a signal distribution module, configured to divide an input signal into a first signal and a second signal; a first signal path, coupled to the signal distribution module, configured to receive the first signal and transmit; a second signal path, coupled to the signal distribution module, configured to receive the second signal, filter out a signal of a preset frequency component and transmit; a phase shift module, arranged in the first signal path or the second signal path, configured to shift the phase of the transmission signal by 180°; a coupling module, coupled to the first signal path and the second signal path, configured to receive the output signals of the first signal path and the second signal path, and output them after coupling. The single-photon detection device provided by the present invention eliminates a large number of gated interference signals, and has a significant optimization effect on the detection efficiency, post-pulse effect, and time resolution of the single-photon detection device.
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