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Preparation device and working method of a hybrid multiplexed single photon source

A multiplexing, single-photon source technology, applied in the field of preparation devices for hybrid multiplexing single-photon sources, can solve the problems of increasing the influence of high-order excitation and affecting photon identity, achieving high identity and realizing Effect of deterministic generation and suppression of noise

Active Publication Date: 2022-04-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, in the experimental process, the probability of generating photon pairs is usually increased by increasing the power of the pump light, which will increase the influence of high-order excitation, that is, a wave packet will contain multiple photons, and this part of the noise influence photon identity

Method used

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  • Preparation device and working method of a hybrid multiplexed single photon source
  • Preparation device and working method of a hybrid multiplexed single photon source
  • Preparation device and working method of a hybrid multiplexed single photon source

Examples

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Effect test

Embodiment 1

[0065] A preparation device for a hybrid multiplexed single photon source, such as figure 1 and figure 2 As shown, it includes a laser 1, a periodically poled lithium niobate thin film 2, a dichroic mirror 3, a first lens 4, a second lens 6, a first fiber coupler 7, a second fiber coupler 9, a cascaded Trigger unit, signal processing unit 10, filter 11 and hybrid multiplexing module;

[0066] The laser 1, the periodically poled lithium niobate thin film 2 and the dichroic mirror 3 are sequentially arranged along the optical path;

[0067] A second lens 6, a first fiber coupler 7, a second fiber coupler 9 and a cascade trigger unit are sequentially arranged on the reflected light path of the dichroic mirror 3;

[0068] The first lens 4, the filter 11 and the hybrid multiplexing module are sequentially arranged on the transmission optical path of the dichroic mirror 3, and the cascaded trigger unit is connected with the signal processing unit 10, and the signal processing uni...

Embodiment 2

[0074] According to the preparation device of a hybrid multiplexing single photon source provided in Example 1, the difference is that:

[0075] The cascade trigger unit includes several NPBSs and SPDs, and the idle light input to the cascade trigger unit passes through the first NPBS15 to divide the optical path into a first reflected light branch and a first transmitted light branch,

[0076] A second NPBS18 is arranged on the first reflected light branch, and the light path is divided into a second reflected light branch and a second transmitted light branch through the second NPBS18, and the second reflected light branch and the second transmitted light branch are respectively provided There is a first SPD24 and a second SPD21;

[0077] A third NPBS17 is arranged on the first transmitted light branch, and the optical path is divided into a third reflected light branch and a third transmitted light branch through the third NPBS17, and the third reflected light branch and th...

Embodiment 3

[0109] According to the preparation device of a hybrid multiplexing single photon source provided in Example 2, the difference is that:

[0110] Several pairs of fourth NPBS16 and fifth SPD20 are arranged side by side on the second transmitted light branch, the fifth SPD20 is arranged on the reflected light path of the fourth NPBS16, and the fifth SPD20 is connected to the signal processing unit 10;

[0111] Several pairs of fifth NPBS19 and sixth SPD25 are arranged on the third reflected optical branch, the sixth SPD25 is arranged on the reflected optical path of the fifth NPBS19 , and the sixth SPD25 is connected to the signal processing unit 10 .

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Abstract

The invention relates to a preparation device and working method of a hybrid multiplexing single photon source. In the device, a pump laser pumps a periodically polarized lithium niobate thin film to probabilistically generate photon pairs with non-degenerate wavelengths. ; The signal light is input to the hybrid multiplexing module; the idle light is input to the cascade trigger unit, and when the cascade trigger unit outputs only one detection signal to the signal processing unit, the signal processing unit triggers the hybrid multiplexer The module is used to spatially modulate the signal light to ensure that a deterministic single photon is generated in the N wave packet sequences of the output signal light. The cascaded trigger unit effectively suppresses the noise caused by the multi-pair effect of photons, so that the trigger result of the idle light can effectively declare whether the signal light is a single photon, and cooperate with the hybrid multiplexing module to realize the deterministic generation of a single photon , so as to realize a single-photon source with high extraction rate and high identity.

Description

technical field [0001] The invention relates to a preparation device and working method of a hybrid multiplexing single photon source, belonging to the field of single photon preparation. Background technique [0002] Realizing quantum light sources with high extraction rate and high identity and applying them to large-scale optical quantum computing tasks is one of the current research hotspots in optical quantum systems. With the development of fast modulation optical devices, a series of multiplexed "announced" single photon sources based on spontaneous parametric down conversion (SPDC) have been studied, and the implementation methods include spatial multiplexing, Time multiplexing, etc. [0003] Each multiplexed light source has certain disadvantages. Time multiplexing requires photon number-resolvable detectors and quantum storage, which means that very long wave packet sequences need to be modulated, and the longer the modulated wave packet sequence, the greater the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/00H01S3/091H01S3/10
CPCH01S3/0085H01S3/0092H01S3/091H01S3/10084
Inventor 逯鹤张婷
Owner SHANDONG UNIV
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