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All-fiber bright compressed state light source based on optical parametric down-conversion

A technology of optical parameters and squeezed states, which is applied in the fields of quantum optics and quantum information, can solve the problems of low nonlinear conversion efficiency and compression, and achieve high nonlinear conversion efficiency, avoid mode matching problems, and high compression

Pending Publication Date: 2022-04-15
JINAN INST OF QUANTUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the four-wave mixing process uses the third-order nonlinear coefficient of the nonlinear medium. At present, the third-order nonlinear coefficient of the nonlinear medium is generally much lower than the second-order nonlinear coefficient. Therefore, the four-wave mixing method is used to obtain the compressed light source. Output, nonlinear conversion efficiency and compression are relatively low

Method used

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  • All-fiber bright compressed state light source based on optical parametric down-conversion
  • All-fiber bright compressed state light source based on optical parametric down-conversion
  • All-fiber bright compressed state light source based on optical parametric down-conversion

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Embodiment 1

[0038] Such as figure 1 As shown, it is a schematic structural diagram of an all-fiber bright squeezed light source based on optical parameter down-conversion in the present invention, including a laser, an isolator, a beam splitter, a frequency doubling medium, a wavelength division multiplexer, and a phase modulator. phase modulator two, beam combiner, circulator, incident grating one, outgoing grating two and optical parametric down conversion medium.

[0039] The laser is a single-frequency fiber laser or a single-frequency semiconductor laser, which is used to output a laser beam in a linearly polarized manner. Preferably, a low-noise single-frequency laser is used. The lower the noise of the laser, the better the output effect. In this embodiment, a 1064nm low-noise single-frequency laser is used.

[0040] The isolator is a fiber-optic isolation device with one-way passage of the beam, connected to the output end of the laser, and used to prevent the laser beam reflect...

Embodiment 2

[0053] Such as figure 2 As shown, it is a schematic structural diagram of an all-fiber bright squeezed light source based on optical parameter down-conversion in the second embodiment of the present invention, including a laser, an isolator, a beam splitter, a circulator, a frequency doubling medium, a phase modulator, and a phase modulation Two, three phase modulators, beam combiner, two circulators, one incident grating, two exit gratings, three incident gratings, four exit gratings and an optical parameter down conversion medium.

[0054] Different from the technical solution of the implementation case 1, the same resonant cavity structure is added for the frequency doubling process in the implementation case 2, which can obtain more usable pump light by improving the frequency doubling efficiency when the output power of the laser is limited.

[0055] In this embodiment, the laser emits 1550nm low-noise single-frequency laser, and enters the beam splitter after passing th...

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Abstract

The invention provides an all-fiber bright compressed state light source based on optical parametric down-conversion. A laser is used for outputting a single-frequency laser beam in a linear polarization manner; the isolator is used for preventing a laser beam reflected by a device in a subsequent light path from returning to the laser; the proportional beam splitter is used for dividing the single-frequency laser output from the isolator into two paths, one path of light enters the frequency doubling medium and is used for generating pump light, and the other path of light enters the optical parametric down-conversion resonant cavity and is used as seed signal light for generating a bright compressed state light source; the wavelength division multiplexer is used for splitting the fundamental frequency light and the pump light; the first phase modulator is used for regulating and controlling the phase of the pump light split by the wavelength division multiplexer and controlling the relative phase difference between the pump light and the seed signal light; the beam combiner is used for combining the pump light modulated and output by the phase modulator I and the seed signal light split by the proportional beam splitter; and the optical parametric down-conversion resonant cavity is used for generating laser output in a bright compression state.

Description

technical field [0001] The present application relates to the technical fields of quantum optics and quantum information, in particular to an all-fiber bright squeezed state light source based on optical parameter down-conversion. Background technique [0002] With the development of science and technology, whether in daily production or scientific research, people have higher and higher requirements for measurement accuracy. But in the classical light field, even an ideal coherent light source contains at least quantum noise, so no matter how the device technology level is optimized, there is a shot noise limit problem in the measurement system. The squeezed light source can redistribute the noise power of the orthogonal components without violating the Heisenberg uncertainty principle, so that the noise power of one of the orthogonal components is much lower than the shot noise limit. When this quadrature component is used for measurement, the quantum noise limit can be e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10
Inventor 刘杨王向斌姜聪韩志勇张万里
Owner JINAN INST OF QUANTUM TECH