Sandwich type high light quantum entanglement photon source

A technology of quantum entanglement and photon source, applied in the field of quantum information and application, can solve the problems of complex regulation and low integration, and achieve the effect of high integration, expansion and fidelity improvement.

Inactive Publication Date: 2013-09-04
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the photons produced by the two BBOs of the existing Beam-like type entangled photon source still have spectral distinguishability and time distinguishability. Differentiation, narrow-band filters must be used to improve fidelity, and the adjustment is more complicated and the integration level is not high

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  • Sandwich type high light quantum entanglement photon source
  • Sandwich type high light quantum entanglement photon source
  • Sandwich type high light quantum entanglement photon source

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Embodiment Construction

[0039] The present invention makes further improvements on the basis of the above-mentioned beam-like II type entangled photon source, and designs a sandwich crystal mechanism. The crystal mechanism of the present invention includes two nonlinear crystals and a half-wave plate placed between the two nonlinear crystals. The cutting angles of the two nonlinear crystals are the same, and it is required that the beam-like type II phase matching is satisfied when the pump laser is normally incident on the crystals, and the directions of the optical axes of the two crystals are parallel. The direction of the optical axis of the half-wave plate is 45 degrees to a plane, which is a plane determined by the directions of the optical axes of the two nonlinear crystals and the direction of the pumping laser light.

[0040] The effect of the half-wave plate is to change the polarization direction of the down-converted photons generated by the first crystal by 90 degrees. Thus, the polariz...

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Abstract

The invention discloses a sandwich type high light quantum entanglement photon source which comprises a pump laser light source and a crystal mechanism. The crystal mechanism is used for receiving pump laser light emitted by the pump laser light source and producing two down-conversion beams provided with entanglement photon pairs. The crystal mechanism comprises two non-linear crystals and a semi-wave plate arranged between the two non-linear crystals. The two non-linear crystals meet II type phase matching. Working wavelength of the semi-wave plate is identical with wavelength of the quantum entanglement photon source. The direction of an optical axis of the semi-wave plate forms an angle of 45 degrees with a plane. The plane is determined by the direction of optical axes of the two non-linear crystals and the direction of the pumping laser light. The sandwich type high light quantum entanglement photon source is convenient to adjust, high in integration degree, beneficial to expansion and capable of being applied to application fields of quantum communication, quantum cryptography and the like.

Description

technical field [0001] The invention belongs to the technical field of quantum information, and in particular relates to a quantum entanglement photon source, which is suitable for application fields such as quantum communication and quantum cryptography. Background technique [0002] Quantum entanglement has the essential characteristics of quantum mechanics - coherence, probability and spatial non-locality, and it is the core resource of quantum information technology. With the help of entangled states, we can accomplish some tasks that are impossible for classical information processes, such as quantum state teleportation, dense coding, quantum precision measurement, etc. Today, researchers have proposed more complex solutions, such as quantum error correction and one-way quantum computing, which require more entangled states of bits. If we want to realize these novel ideas, we must be able to conveniently prepare multi-bit entangled states. [0003] Although there are ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
Inventor 黄运锋张超柳必恒李传锋郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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