Making device of continuous variable entanglement source for signal modulation

Abstract

The invention provides a making device of a continuous variable entanglement source for signal modulation, belongs to the field of quantum optics and aims at solve the problems of entanglement degree reduction, complicated structure and high cost caused by an existing making device. A single-frequency laser bidirectional pumping degenerate optical parametric oscillator produces signal light and idle light which are separated by a local oscillation light and injection signal light separating system into local oscillation light and injection signal light. After part of signal light, namely the injection signal light, is coupled by an optical fiber coupler, the light is modulated by an electro-optical amplitude modulator and an electro-optical phase modulator to obtain injection signal light produced after modulation for the first time and is reflected by a reflector, the reflected injection signal light is modulated by the electro-optical phase modulator and the electro-optical amplitude modulator and then is reversely injected into the degenerate optical parametric oscillator for parametric amplification, and then a spatially coincident and signal-modulated two-component continuous variable entanglement light field is produced and are separated into two beams by a first optical splitter space. Frequency shift modulation signals required by modulation are produced by a frequency shift signal producing system.

Description

technical field [0001] The invention relates to the technical fields of quantum optics and quantum information, in particular to a preparation device for a signal modulation continuous variable entanglement source. Background technique [0002] The continuous variable entanglement source is the basic resource of quantum information processing, which can be applied to quantum information processing tasks such as quantum communication, quantum computing, and quantum measurement; its entanglement physical quantity is the generalized position and momentum of the quantized optical frequency electromagnetic field, that is, the orthogonality of the optical field portion. The continuous variable entanglement state light field generated by the continuous variable entanglement source can be easily measured by a balanced zero-beat detector, which has the advantage of high detection efficiency; at the same time, the preparation process of the continuous variable entanglement state light...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the current preparation device of the signal modulation continuous variable entanglement source will cause the entanglement degree of the signal modulation continuous variable entanglement source to decrease, which will affect the performance of the subsequent quantum information processing protocol, complex structure and high cost, and provide A preparation device for signal modulation continuous variable entanglement source

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