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Device and method for locking single photon intensity in real time

A real-time locking, single-photon technology, applied in measuring devices, photometry, optical radiation measurement, etc., can solve the problems of reducing imaging clarity, imaging blurred information, loss, etc., and achieves simple structure, high stability, and practicability strong effect

Pending Publication Date: 2019-08-20
XINZHOU TEACHERS UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the field of quantum imaging, single-photon intensity fluctuations will reduce imaging clarity, resulting in blurred imaging and loss of information

Method used

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  • Device and method for locking single photon intensity in real time
  • Device and method for locking single photon intensity in real time
  • Device and method for locking single photon intensity in real time

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Embodiment Construction

[0014] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] A device for locking single-photon intensity in real time, including laser 1, isolator 2 (THORLABS, IO-G-1550), attenuator 3 (THORLABS, VOA50PM-APC), intensity modulator 4 (CODEON, Mach-10), Optical fiber intensity beam splitter 5 (THORLABS, PN1550R5A1), single photon detector 6 (Princeton Lightwave, PGA), photon counter 7 (SRS, SR400), analog proportional integral differential controller 8 (SRS, SIM960), oscilloscope 9 (YOKOGAWA , DLM2054).

[0016] Such as figure 1 As shown, the 1550nm linearly polarized laser output from the laser 1 passes through the isolator 2, the attenuator 3, and the intensity modulator 4 in sequence, and then enters the 50:50 optical fiber intensity beam splitter 5. The first output end of the optical fiber intensity beam splitter 5 and the single photon The input end of the detector 6 is connected, the secon...

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Abstract

The invention discloses a device and method for locking single photon intensity in real time. Through single photon detection, a discrete single photon signal is converted into a TTL pulse signal. A photon counter performs digital-to-analog conversion on the digital pulse signal to output an analog voltage signal of corresponding amplitude. An analog proportional integral derivative controller carries out negative feedback operation on the analog voltage signal and set reference voltage and outputs an error signal, and the error signal is loaded to the bias control port of an intensity modulator. The single photon intensity is locked to set intensity in real time by continuously adjusting the single photon intensity. According to the invention, the intensity fluctuation of a single photoncan be effectively compressed; the problems of unable single photon intensity locking and continuous tuning output are solved; and the device and method have the characteristics of simple structure, high practicability, high stability, tunable output and the like, and can be applied to the fields of quantum communication, sensing detection, quantum imaging and the like.

Description

technical field [0001] The invention belongs to the field of laser technology, specifically a device and method for locking single-photon intensity in real time. Based on single-photon detection and digital-to-analog conversion, the discrete single-photon signal is converted into an analog voltage output, and an analog proportional-integral-derivative controller is used to convert the analog The voltage and the reference voltage are negatively fed back to obtain the error signal, and the error signal is loaded to the intensity modulator to continuously adjust the single-photon intensity, and finally the single-photon intensity is locked at the set intensity in real time. Background technique [0002] At present, the precise locking of single photon intensity is of great significance in the fields of quantum communication, sensing detection, quantum imaging and so on. In the field of quantum communication, single photon is the carrier of quantum information transmission, and ...

Claims

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Application Information

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IPC IPC(8): G01J1/44G01J11/00
CPCG01J1/44G01J11/00G01J2001/442G01J2001/444
Inventor 于波丁伟杰张清
Owner XINZHOU TEACHERS UNIV
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