Production system and method for polarization-orbital angular momentum mixed entangled state single photon

Abstract

The invention discloses a production system and method for a polarization-orbital angular momentum mixed entangled state single photon. The system comprises an LD pumping source, an optical coupling system, a laser resonant cavity, a light beam regulating unit, a Q-plate converter and a purification unit, all of which are connected in sequence. The LD pumping source is used for producing pumping light and providing an input signal for the system. The optical coupling system is used for carrying out collimation and focusing on the pumping light. The laser resonant cavity is used for providing feedback energy, and the direction and frequency of the pumping light are selected. The light beam regulating unit is used for regulating the pumping light and outputting a horizontal polarization single photon. The Q-plate converter is used for converting the horizontal polarization single photon into the polarization-orbital angular momentum mixed entangled state single photon. The purification unit is used for carrying out purification on the polarization-orbital angular momentum mixed entangled state single photon. The high-purity polarization-orbital angular momentum mixed entangled state single photon can be stably produced, and the system structure and the production process are simple.

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 capable of stably generating high-purity polarization-orbital angular momentum mixed entangled state single photons. Background technique [0002] Quantum entanglement refers to the non-local correlation between physically separable multi-subsystem quantum systems, that is, the measurement result of one subsystem cannot be independent of the measurement parameters of other subsystems. Quantum entanglement constitutes an indispensable important resource and information carrier in modern quantum information technology. Entanglement in a broad sense not only exists between multiple photons, but also exists between different degrees of freedom of the same photon. In recent years, single-photon entangled states have potential applications in designing quantum information processing devices. For example, ...

AI Technical Summary

Problems solved by technology

For example, due to the constraints of the material performance of the device, after the light beam passes through the Q-plate, two quantum states with different properties, the polarization-orbital angular momentum mixed entangled state and the polarization state, exist at the same time, and the purity of the obtained quantum mixed entangled state is very high. Low

If this kind of entangled state with low purity is used for quantum communication and quantum computing, it will lead to information distortion and increase the bit error rate.

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