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Compact single crystal thin cavity and entangled photon source system using same

A single crystal, compact technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of high system complexity and large volume, and achieve the effect of simple operation, small volume, and enhanced spectral brightness

Pending Publication Date: 2019-08-30
青岛鲲腾量子应用技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional narrow-linewidth photon pairs based on intracavity spontaneous parametric down-conversion have a large volume and high system complexity, and additional resonators are needed to obtain narrow-linewidth photon pairs. Such a huge photon generation system cannot meet the requirements for small Requirements for a highly integrated quantum control system

Method used

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  • Compact single crystal thin cavity and entangled photon source system using same
  • Compact single crystal thin cavity and entangled photon source system using same
  • Compact single crystal thin cavity and entangled photon source system using same

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Such as Figure 1-2 As shown, the compact single crystal thin cavity includes a cavity and a crystal, and the output of the compact single crystal thin cavity is divided into vertically polarized photons and horizontally polarized photons by a polarization beam splitter. Let vertically polarized photons be signal photons, and horizontally polarized photons be idler photons. The single crystal is a phase-matched phase-matched periodically polarized potassium hydrogen phosphate PPKTP, and the compact single crystal thin cavity is set in a crystal temperature-controlled furnace. Among them, the working temperature range of the temperature control furnace is within 15 to 70 degrees Celsius, and the temperature control accuracy is 2mK.

[0050] An antireflection film for pump light and a total reflection film for the first wavelength beam are provided on the entrance face of the single crystal, and an antireflection film for pump light and a partial reflection film for the ...

Embodiment 2

[0064] Such as figure 1 As shown, an entangled photon source system using the compact single crystal thin cavity described in Embodiment 1, the system includes a pumping laser Laser, a first optical sheet assembly, a dichroic mirror DM, a second Optical sheet assembly, split light transmission assembly, two unequal-arm fiber optic interferometers, coincidence counting assembly.

[0065] The pumping laser Laser is used to emit pumping light with a predetermined wavelength, and the output laser linewidth is <10 MHz; thereby ensuring a narrow linewidth. In this embodiment, the pumping light with a wavelength of 780 nm is selected.

[0066] The first optical plate assembly is used to adjust the polarization of the pump light and reduce the spot diameter; the first optical plate assembly is sequentially arranged on the wave plate unit and the first lens unit on the optical path. Specifically, the first optical plate assembly includes a half-wave plate HWP1 and a quarter-wave plate...

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Abstract

The invention relates to the field of laser technologies, nonlinear optical physical technologies, quantum optics technologies and quantum communication technologies, in particular to a compact singlecrystal thin cavity and an entangled photon source system using the same. The free spectral path range (FSR) and the line width delta v of the compact single crystal thin cavity satisfy the followingformulae as shown in the description. The compact single crystal thin cavity adopts a very thin nonlinear crystal single-cavity structure, and has the advantages of being small in size and easy to control; the proper cavity length l and coating parameters are selected, wherein the coating parameters are used for adjusting the transmittance T; and by only satisfying the formula (2), the required photonic line width can be freely designed. Moreover, due to the resonance effect of the compact single crystal thin cavity, the spectral brightness of generated photons is greatly enhanced relative tothe spectral brightness during single pass; the surface is subjected to theoretical calculation; and an enhancement factor of the spectral brightness of photon pairs generated by the compact single crystal thin cavity relative to the spectral brightness during the single pass is in direct proportion to the square (F<2>) of the fineness of the compact single crystal thin cavity.

Description

technical field [0001] The invention relates to the technical fields of laser technology, nonlinear photophysics, quantum optics and quantum communication, in particular to a compact single crystal thin cavity and an entangled photon source system using the thin cavity. Background technique [0002] Quantum entanglement sources are the cornerstone of research on quantum information technology. Quantum light sources with high brightness, miniaturization and high entanglement will bring great convenience to research related to quantum communication, calculation and measurement. Long-distance optical fiber communication requires that the transmitted photon wavelength is within the communication window of the optical fiber. In addition, the transmitted photon linewidth needs to be narrow, so as to effectively avoid the influence of fiber dispersion on photon pulse broadening. On the other hand, long-distance quantum communication requires the use of quantum repeaters. The core o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/355
CPCG02F1/3551G02F1/3558G02F1/3553G02F1/3544G02F1/3517
Inventor 周志远李银海史保森郭光灿
Owner 青岛鲲腾量子应用技术有限公司
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