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Polarization-entangled quantum light source

A polarization and light source technology, applied in the field of quantum information science, can solve the problems of limiting the practical development of polarization-entangled quantum light sources and difficult to collect photons, and achieves the effects of simple structure, high collection and transmission efficiency, and easy realization.

Active Publication Date: 2011-07-20
TSINGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method relies on bulk optics and requires precise optical alignment and adjustment; on the other hand, it is difficult to efficiently collect photons from the crystal into the optical fiber.
These all limit the practical development of crystal-based polarization-entangled quantum light sources

Method used

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Embodiment Construction

[0028] The polarization-entangled quantum light source of the present invention is described in detail as follows with reference to the drawings and embodiments.

[0029] The core idea of ​​the present invention is: by controlling the polarization state of the pump light, the spontaneous scalar four-wave mixing process can be independently excited on the two polarization axes of the third-order nonlinear optical waveguide with equal intensity; at the same time, using the third-order nonlinear optical waveguide The birefringence characteristic of the waveguide suppresses the spontaneous vector four-wave mixing process in the waveguide, so that the third-order nonlinear optical waveguide outputs polarization-entangled two-photons under pump light excitation.

[0030] Such as figure 1 As shown, a polarization-entangled quantum light source according to an embodiment of the present invention includes:

[0031] The pumping light generating device (shown in the dotted line box in t...

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Abstract

The invention discloses a polarization-entangled quantum light source which comprises a pumping light generator, a three-order nonlinear optical waveguide and a light-splitting and filtering device, wherein the pumping light generator is used for generating pulse pumping light and inputting the pulse pumping light to the three-order nonlinear optical waveguide; the three-order nonlinear optical waveguide has a characteristic of double refraction and is used for independently exciting a spontaneous scalar four wave mixing process on two polarization shafts, generating a signal with a polarization-entangled characteristic and an idler frequency two-photon and inhibiting a spontaneous vector four wave mixing process; and the light-splitting and filtering device is used for separating the signal and the idler frequency two-photon which are output from the three-order nonlinear optical waveguide from the pulse pumping light to obtain a polarization-entangled two-photon. The polarization-entangled quantum light source in the invention has a simple and compact structure and high efficiency for generating and collecting the polarization-entangled two-photon.

Description

technical field [0001] The invention relates to the technical field of quantum information science, in particular to a polarization-entangled quantum light source. Background technique [0002] Using the basic principles of quantum mechanics, quantum information technology can realize many applications that cannot be realized by classical information technology, which has important academic significance and application value. Quantum entanglement (quantum entanglement) is an important quantum resource on which the realization of quantum information functions depends, and it is a phenomenon of quantum mechanics. It describes a special class of quantum states of composite systems (with more than two subsystems) by definition. This quantum state cannot be decomposed into the tensor product (tensor product) of the respective quantum states of the subsystems, and is a non-local correlation between physically separated subsystems. For multiple subsystems in quantum entanglement,...

Claims

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Application Information

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IPC IPC(8): H01S3/108H01S3/101H01S3/098
Inventor 张巍周强黄翊东彭江得
Owner TSINGHUA UNIV
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