Photon pair source without spectral correlation

A photon pair and laser light source technology, which is applied in optics, lasers, nonlinear optics, etc., can solve problems such as complex operation and reducing the output brightness of photon sources, and achieve the effects of high integration, easy expansion, and simple structure

Pending Publication Date: 2020-10-30
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0005] In view of the above technical problems, this disclosure proposes a spectrally unrelated photon pair source based on periodically poled potassium titanyl phosphate crystals, which is used to solve at least the existing general standard periodic poled crystal (PPKTP) photon pair source. The yield distribution will be li

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  • Photon pair source without spectral correlation
  • Photon pair source without spectral correlation
  • Photon pair source without spectral correlation

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Embodiment Construction

[0028] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present disclosure.

[0029] The terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the invention. The terms "comprising", "comprising", etc. used herein indicate the presence of stated features, steps, op...

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Abstract

The invention discloses a photon pair source without spectral correlation. The photon pair source comprises a laser light source and a periodically poled potassium titanyl phosphate crystal, the periodically poled potassium titanyl phosphate crystal is a nonlinear crystal with II-type phase matching, and the periodically poled potassium titanyl phosphate crystal is used for generating photon pairswithout spectral correlation according to the parametric down-conversion process of laser emitted by the laser light source, wherein the polarization region of the II-type phase-matched periodicallypolarized potassium titanyl phosphate crystal is divided into a central region and two edge regions in the laser incident direction. By reasonably designing the duty ratio of the central region and the crystal length, the photon yield of the photon pair source is in Gaussian distribution, the problem of time distinguishability and the problem of spectrum distinguishability are solved, and the original brightness of photons is guaranteed while the photons are irrelevant to the spectrum. The photon pair source is convenient to adjust in practical application, high in integration level and easy to expand.

Description

technical field [0001] The present disclosure relates to the technical field of quantum information processing, in particular to a source of photon pairs without spectral correlation based on periodically poled potassium titanyl phosphate crystals. Background technique [0002] Entangled state is the core resource in the field of quantum information, it is Called "the essence of quantum mechanics", it exhibits the peculiar properties of quantum theory such as coherence, probability and spatial non-locality, and has been widely used in quantum cryptography, quantum state teleportation, quantum In the booming field of quantum information such as entanglement exchange, quantum storage and quantum computing. [0003] In the field of traditional linear optical quantum information, there are many ways to generate entangled photon pairs. At present, the most commonly used method is to use nonlinear optical crystals such as β-barium metaborate crystal (BBO) or periodically poled p...

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Application Information

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IPC IPC(8): H01S3/00H01S3/094G02F1/35
CPCG02F1/3544H01S3/0092H01S3/094
Inventor 吴典钟翰森何玉明陆朝阳潘建伟
Owner UNIV OF SCI & TECH OF CHINA
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