Device for generating two-component continuous variable high-order orbital angular momentum entangled state

Abstract

The invention provides a device and method for preparing a two-component continuous variable high-order orbital angular momentum entangled state, and the device comprises a Ti sapphire laser, a reflector, an optical beam splitter, a half-wave plate, an electro-optical modulator, a high-frequency signal generator, a filter, a lens group, a Glan laser prism, a cesium atom pool, a Glan-Thompson prism, a light beam collector, a balanced zero-beat detector, an adder-subtractor and a spectrum analyzer. According to the device, the continuous variable high-order orbital angular momentum entangled state with the maximum entanglement degree of-3.8 dB can be obtained, the device is stable in performance and compact in structure, and commercialized production can be achieved. The cesium atom D1 line transition frequency corresponds to a quantum dot exciton emission region of indium arsenide. The generated two-component continuous variable high-order orbital angular momentum entangled state light source corresponding to the cesium atom D1 line transition frequency can be applied to the fields of coherent interface research based on atoms and a solid-state system, quantum precision measurement and the like.

Description

technical field [0001] The invention relates to the field of orbital angular momentum entangled light sources, in particular to a device for generating two-component continuous variable high-order orbital angular momentum entangled states. Background technique [0002] Quantum entanglement, as a basic resource for quantum information processing, has potential applications in the fields of quantum communication networks and quantum computing. With the continuous expansion of quantum communication networks and the continuous improvement of the complexity of quantum computing, the research on multi-dimensional, multi-component and multi-degree-of-freedom entangled states has attracted more and more attention. Orbital angular momentum (OAM), as a special degree of freedom, its unique spatial structure and high-dimensional characteristics can greatly improve the channel capacity and transmission rate of quantum communication. Using OAM beams as different carriers to multiplex an...

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Problems solved by technology

However, so far, there are few reports on the generation of continuous variable high-order orbital angular momentum entangled states by using the nondegenerate four-wave mixing process in the cesium atomic ensemble

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