Multi-mode quantum light source realization device based on four-wave mixing process in rubidium vapor

Abstract

The invention discloses a multi-mode quantum light source realization device based on a four-wave mixing process in rubidium vapor. Laser emitted by a titanium sapphire laser device sequentially passes through a 1/2 wave plate and a polarization beam splitter and then is divided into a first laser beam and a second laser beam; the first laser beam is sequentially emitted into an acoustic optical modulator and a 1/4 wave plate and then is sequentially reflected back to the acoustic optical modulator, and passes through a single-mode optical fiber to generate probe light; the second laser beam sequentially passes through the single-mode optical fiber, the 1/2 wave plate, the polarization beam splitter, the 1/4 wave plate and a conical prism to generate pumping light; the probe light and the pumping light are subjected to a four-wave mixing reaction in a rubidium tank to generate conjugate light; the pumping light is eliminated by a Glan-Thompson prism and the probe light penetrates through a punching reflection mirror; the conjugate light is reflected by the punching reflection mirror; the probe light and the conjugate light are input into different detectors respectively, and electric signals output by the detectors pass through a subtractor and then are connected to a frequency spectrum analyzer, and then are analyzed to obtain quantum squeezing. With the adoption of the multi-mode quantum light source realization device, an ultra-large-size multi-mode quantum state is realized by using degree of spatial freedom.

Description

technical field [0001] The invention belongs to the field of quantum information processes, and in particular relates to a multi-mode quantum light source realization device based on a four-wave mixing process in rubidium vapor. Background technique [0002] Multicomponent quantum states play an important role in quantum optics and quantum information processes. Therefore, many groups have been working hard to achieve multi-component quantum states, and have achieved certain success. The conventional approach to realize continuously variable multicomponent quantum states is to use a single-mode squeezed beam generated from an optical parametric oscillator and multiple beamsplitter mirrors to generate continuously variable quantum networks. This method of generating continuously variable multicomponent states lacks scalability because the experimental setup becomes very complex as the quantum modulus increases. To overcome this problem, some groups have proposed to use a si...

AI Technical Summary

Problems solved by technology

However, no group has exploited spatial degrees of freedom to achieve ultra-large-scale quantum states

[0003] In order to solve the technical problem that the above-mentioned prior art cannot use the space degree of freedom to realize the super-large-scale quantum state, the present invention proposes a multi-mode quantum light source realization device based on the four-wave mixing process in rubidium vapor

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