System and method for generating multi-wavelength announced single-photon source based on lbo crystal

A single-photon source, multi-wavelength technology, applied in the field of quantum information, can solve problems such as large volume, difficulty in uniform modulation, and uneven performance, and achieve the effects of large number of carriers, increased transmission rate, and large field enhancement effect

Active Publication Date: 2021-01-26
NAT QUANTUM COMM GUANGDONG CO LTD
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Problems solved by technology

However, the laser arrays are independent of each other, the volume is large, the performance is not uniform, and it is difficult to uniformly modulate

Method used

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  • System and method for generating multi-wavelength announced single-photon source based on lbo crystal
  • System and method for generating multi-wavelength announced single-photon source based on lbo crystal
  • System and method for generating multi-wavelength announced single-photon source based on lbo crystal

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Embodiment 1

[0033] Such as Figure 1-3 As shown, the announced multi-wavelength single photon source generation system based on the micro-ring cavity structure includes an optical frequency comb unit-1', an entangled source unit-2', and an announced unit-3'. The various units are connected by optical fibers, wherein:

[0034] The pump unit-1' includes a laser-101 and a microcavity-102; the laser 101 is a laser with a wavelength near 0.71 μm, which is used to generate pulsed laser light; The four-wave mixing process produces an optical frequency comb. The microcavity is manufactured using a silicon-based process and has a high Q value (greater than 180,000), and its structure can be a microring or a microbubble+waveguide.

[0035] The entanglement source unit 2' includes a first microscopic objective lens-201, an LBO crystal-202, and a second microscopic objective lens-203; the first microscopic objective lens focuses the laser light output by the microcavity 102 to the LBO crystal; the ...

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Abstract

The invention discloses a multi-wavelength announced single-photon source generation system and method based on LBO crystals. The invention uses optical frequency comb technology to excite wavelength intervals with good carrier-to-noise ratio, high flatness, and large number of carriers by a single laser light source. Uniformly distributed multi-wavelength sub-carriers, entangled photon pairs generated by LBO crystals with high nonlinear coefficients, the wavelengths are 1.3 μm and 1.55 μm, of which idler light uses 1.3 μm, signal light uses 1.55 μm, and the wavelength is in the communication band. Low loss; using commercially mature wave-division multiplexing devices, such as arrayed waveguide gratings to separate photons, has high isolation and low insertion loss; using declared light source technology, idler light (1.3μm) pulses are used as detection signal light (1.55μm ) timing gating signal, which greatly reduces the influence of dark counting, and is beneficial to increase the key generation rate and safe transmission distance of the quantum key distribution system.

Description

technical field [0001] The present invention relates to the technical field of quantum information, and more specifically, to a system and method for generating a multi-wavelength announced single photon source based on LBO crystals. Background technique [0002] Quantum information is a cutting-edge interdisciplinary subject produced by the combination of quantum mechanics and information science, mainly including quantum communication and quantum computing. In quantum communication technology, photons are widely used as the carrier of quantum communication because they are relatively less affected by the environment. Photons are also an important resource in quantum computing based on linear optics. [0003] Since Bennett and Brassard proposed the first protocol (BB84) in 1984, Quantum Key Distribution (QKD) based on single photons has become the most promising technology at present, and people have done many laboratory or field demonstrations , and even some companies h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02F1/355H01S3/00H01S3/11
Inventor 郭邦红胡敏张立涛
Owner NAT QUANTUM COMM GUANGDONG CO LTD
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