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Predictable single-photon source generation device

A technology for generating devices and single photon sources, applied in optics, nonlinear optics, instruments, etc., can solve problems such as the inability to guarantee the generation of one or only one photon pair

Active Publication Date: 2018-10-16
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

Since the generation of paired photons is random, based on the predictable single-photon source generated by associated two-photons, it cannot be guaranteed that one or only one photon pair will be generated each time, so g 2 (0)>0

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  • Predictable single-photon source generation device

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Embodiment Construction

[0039] The basic idea of ​​the present invention is: aiming at the fluctuation of the incident laser power, a laser power stabilization system is used to adjust the incident light in real time to achieve the purpose of stably outputting single photons; switch, reducing multiphoton events in single photon sources, reducing g 2 (0) value.

[0040] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0041] combine figure 1 As shown, a predictable single photon source generating device includes a main optical path, a No. 1 parallel photon branch, a No. 2 parallel photon branch and a feedback branch. in:

[0042] A pumping light source 1 , a periodically polarized crystal 2 and a No. 1 beam splitter 3 are sequentially arranged on the main optical path along the propagation direction of the optical path from front to back. Wherein: the pump light source 1 is used to pump the periodically polarized crystal...

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Abstract

The invention discloses a predictable single-photon source generation device. The predictable single-photon source generation device can predict one kind of single-photon sources based on the associated double-photon generation, and on the basis of the principle, a laser power stabilization system, a multi-photon discrimination device and a high-speed optical switch are introduced so that single-photon output has higher stability and lower noise. The laser power stabilization system is introduced to feed back and control fluctuation of pump light in real time and indirectly improve the outputstability of the single-photon sources. Because the generation of single photon is a probability event, a certain possibility exists so that two photons or above generate simultaneously (that is a multi-photon event). The possibility of the occurrence of the multi-photon event and a photon counting event generated by non-associative photons determines the noise of single-photon sources, the high-speed optical switch is used for 'removing' the multi-photon event as much as possible so as to reduce the noise of the single-photon sources, thereby achieving the low-noise and high-stability outputof the single-photon sources.

Description

technical field [0001] The invention relates to a predictable single photon source generating device. Background technique [0002] Single photon sources are widely used in quantum cryptography communication, linear quantum computing, quantum metrology, etc., and are an indispensable and important part of the field of quantum information. An ideal single-photon source is defined as a light source that radiates one and only one photon at a given time; or is defined as a light source whose simultaneous second-order correlation is zero (the second-order correlation function g 2 (0)=0). [0003] At present, there is no ideal single-photon source. The existing ways to generate single-photon mainly include coherent light attenuation method, predictable single-photon source based on correlated two-photon generation, quantum dot photoluminescence, and single-emitting center-based Single photon generation, etc. [0004] The basic requirements for single photon source generation ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
CPCG02F1/35
Inventor 刘长明史学舜刘红博张鹏举庄新港
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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