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Multi-wavelength heralded single-photon-source generating system and method based on LBO crystal

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

Active Publication Date: 2018-01-19
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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  • Multi-wavelength heralded single-photon-source generating system and method based on LBO crystal
  • Multi-wavelength heralded single-photon-source generating system and method based on LBO crystal
  • Multi-wavelength heralded single-photon-source generating system and method 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 heralded single-photon-source generating system and method based on an LBO crystal. An optical frequency comb technology is adopted, a single laser light source excites multi-wavelength subcarriers which are good in carrier-to-noise ratio, high in flatness, large in carrier quantity and uniform in wavelength interval distribution and the LBO crystal whichis high in nonlinear coefficient are utilized to generate an entanglement photon pair, wherein the wavelengths are 1.3 micrometers and 1.5 micrometers, idler frequency light uses 1.3 micrometers, signal light uses 1.55 micrometers, the wavelengths are in the communication wave band, and the optical fiber loss is small; commercial mature wavelength division demultiplexers are utilized, for example, an arrayed waveguide an arrayed waveguide grating demultiplexer is utilized for photon separation, the isolation degree is high and insertion loss is small; an heralded light source technology is adopted, the idler frequency light (1.3 micrometers) pulse is used as a timed gating signal of probing signal light (1.55 micrometers), the dark count influence is drastically reduced, and the secret key formation rate and the safe transmission distance of a quantum secret key distributing system are increased.

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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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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