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Multi-degree of freedom mixed entangled W-state photon producing system and method

A degree of freedom, photonic technology, applied in the field of quantum information and optical communication, to achieve the effects of improving security, scalable large-capacity quantum information processing, and easy to use

Active Publication Date: 2015-06-10
国腾(广州)量子计算科技有限公司
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Problems solved by technology

This scheme utilizes the multiple degrees of freedom (spin, frequency and other spatial modes) of single photons to realize the expansion of information capacity, and the superposition of multiple modes improves the robustness (Robust) of single photons in quantum communication; but limited by the ideal The limit of single-photon preparation level has not been applied in the field of practical quantum communication

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  • Multi-degree of freedom mixed entangled W-state photon producing system and method
  • Multi-degree of freedom mixed entangled W-state photon producing system and method

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Embodiment Construction

[0032] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0033] Refer to attached figure 1 To attach figure 2 As shown, a multi-degree-of-freedom hybrid entanglement W-state photon generation system includes a first hybrid entanglement unit 10 , a second hybrid entanglement unit 11 , a polarization entanglement unit 12 , and an entanglement exchange unit 13 . The output end of the first hybrid entanglement unit 10 , the output end of the second hybrid entanglement unit 11 and the output end of the polarization entanglement unit 12 are respectively connected to the entanglement exchange unit 13 .

[0034] The first hybrid entanglement unit 10 is used to generate orbital angular momentum-polarization entangled photon pairs. The second hybrid entanglement unit 11 is used to generate linear momentum-polarization entangled photon pairs. The polarization entanglement unit 12 is used to generate mutually p...

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Abstract

The invention discloses a multi-degree of freedom mixed entangled W-state photon producing system and method. The multi-degree of freedom mixed entangled W-state photon producing system comprises a first mixing entanglement unit, a second mixing entanglement unit, a polarization entanglement unit and an entanglement exchange unit, wherein the first mixing entanglement unit is used for producing an orbital angular momentum-polarization entanglement photon pair, the second mixing entanglement unit is used for producing a linear momentum-polarization entanglement photon pair, the polarization entanglement unit is used for producing mutually-perpendicular polarization entanglement photon pairs, and the entanglement exchange unit is used for performing entanglement exchange on the orbital angular momentum-polarization entanglement photon pair, the linear momentum-polarization entanglement photon pair and the mutually-perpendicular polarization entanglement photon pairs and obtaining multi-degree of freedom mixed entangled W-state photons. The W-state photons facilitate improvement of the safety of quantum communication and have a strong entanglement characteristic and bit loss resisting capacity, and the influence of noise, decoherence and other factors is reduced.

Description

technical field [0001] The invention belongs to the technical field of quantum information and optical communication, and specifically relates to a generation system and method of multi-degree-of-freedom mixed entangled W-state photons. Background technique [0002] Quantum entanglement is a nonlocal correlation in many-particle quantum systems. Entangled states include Bell states, GHZ states, W states and so on. Entangled Bell states and GHZ states have achieved many results in quantum teleportation, quantum dense coding, quantum key distribution and other fields. At present, entangled W states have attracted intense attention due to their ability to resist bit loss and strong entanglement properties. The W state is different from the common entangled state. Even if an untrusted user measures a particle in a multi-particle system, and a trusted user communicates and negotiates to discard a particle and loses a particle that can be loaded with bit information, the remaini...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/70
Inventor 郭邦红范榕华郭建军张程贤张文杰杜戈
Owner 国腾(广州)量子计算科技有限公司
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