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A Polarization-Independent Quantum Frequency Upconversion Method

A conversion method and polarization technology, applied in the directions of instruments, optics, electromagnetic transmitters, etc., can solve the problems of low conversion efficiency and short crystal length, and achieve the effect of simple method and maintaining integrity

Inactive Publication Date: 2016-04-06
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is limited by the light walking away in the crystal, the length of the crystal is very short, and the conversion efficiency is not high.
Also, there is a time delay between the sum-frequency light generated in the two crystals

Method used

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  • A Polarization-Independent Quantum Frequency Upconversion Method
  • A Polarization-Independent Quantum Frequency Upconversion Method
  • A Polarization-Independent Quantum Frequency Upconversion Method

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Embodiment

[0033] Example: such as figure 2 As shown, this embodiment specifically relates to a polarization-independent quantum frequency up-conversion method. This novel polarization-independent wavelength conversion method combines zero-type phase matching and second-type phase matching to convert mutually orthogonal polarization states. Features, realize coaxial, polarization-independent frequency up-conversion without phase delay. The second type of phase matching and the zeroth type of phase matching are respectively used in the same optical path. During the second type of phase matching, the polarization of the incident pump light and the signal light are perpendicular to each other, and the polarization of the outgoing up-converted light is consistent with that of the signal light. ; In the phase-matching process of the zeroth type, the polarization directions of the incident pump light and the signal light and the outgoing up-converted light are consistent, and the up-converted...

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Abstract

The invention belongs to the technical field of wavelength conversion, and particularly relates to a polarization-independent quantum frequency upconversion method. According to the upconversion method, according to the characteristic that a light path of phase matching type II and a light path of phase matching type 0 can be coaxially and serially connected to convert mutually cross polarization states, coaxial phase-delay-free polarization-independent frequency upconversion is realized. The method has the advantages that the method is simple, light quantum frequency upconversion of entangled states of cross polarization is realized by the aid of the coaxially and serially connected light path of phase matching type 0 and light path of phase matching type II, delay-free beam combination of two polarizations can be achieved by regulating a compensator, integrity of incident signal light is maintained, and the method in the design has the polarization-independent characteristic.

Description

technical field [0001] The invention belongs to the technical field of wavelength conversion, and in particular relates to a polarization-independent quantum frequency up-conversion method. Background technique [0002] The outstanding advantages of quantum computers have attracted many scientists to engage in related research. In quantum communication, photons can be used as carriers, and entangled states can be used as qubits to encode information. The 1550nm wavelength band is the best for optical fiber communication, and the storage of entangled state information is currently the most efficient in rubidium vapor, and its wavelength is around 800nm. Therefore, how to realize the mutual conversion between photons near 800nm ​​and photons in the communication band of 1550nm without changing the quantum properties, especially the entangled state, has become a key issue. In 1992, Kumar tested the non-classical intensity correlation of photons before and after frequency conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02B27/28H04B10/50
Inventor 周茜汤瑞凯李雄杰武愕潘海峰吴伯涛曾和平
Owner EAST CHINA NORMAL UNIV