Continuous variable quantum state frequency transformation device

Abstract

The invention relates to a continuous variable quantum state frequency transformation device, which comprises a pump light source, wherein laser output by the pump light source is divided into two beams, one laser beam is coupled to input continuous variable light field quantum state after passing through a light intensity control system and a beam coupling system in sequence, frequency transformation quantum state is generated through a pattern matching system and a nonlinear optical resonator, and the frequency transformation quantum state enters a balance zero-beat measuring system through a beam collimation system and a light field filter system; the outer laser beam output by the pump light source is coupled to input local light field after passing through a second light intensity control system and a second beam coupling system in sequence, frequency transformation local light field is generated through a second pattern matching system and a second nonlinear optical resonator, and the frequency transformation local light field enters the balance zero-beat measuring system through a second beam collimation system and a second light field filter system. The device can realize continuous variable quantum state frequency transformation with high efficiency and high fidelity, and is not sensitive to extra-noise of pump light.

Description

technical field [0001] The invention relates to the fields of continuous variable quantum optics and quantum information, in particular to a continuous variable quantum state frequency conversion device. Background technique [0002] Quantum information networks based on light fields and atomic systems have received great attention and exciting research progress. Due to its extremely fast propagation speed and weak decoherence characteristics, the light field is suitable for long-distance transmission as the carrier of quantum states; and atoms are suitable for the storage of quantum states due to their long coherence time. For future quantum information networks based on light fields and atomic systems, quantum states need to be transferred between different physical carriers with high fidelity. In a real environment, each node of a quantum information network is usually composed of different physical systems, thus having different optical characteristic frequencies. Ther...

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Problems solved by technology

This document introduces a resonant cavity, which enhances the nonlinear interaction and is suitable for the frequency conversion of quantum states in the case of continuous waves. The disadvantage is that the resonant cavity resonates with both the input signal light field and the sum-frequency up-conversion light field. Due to the limitation of cavity line width, this scheme is only suitable for narrowband quantum state frequency conversion, which has great limitations

The literature "Frequency conversion of continuous variable quantum states, J.Opt.Soc.Am.B 25,269 (2008)" theoretically analyzes the frequency conversion of the broadband continuous wave continuous variable quantum state based on the resonant cavity, and studies the effect of the additional fluctuation noise of the pump light on the The impact of quantum state frequency transformation, but the literature does not propose how to effectively overcome the adverse effects of the additional fluctuation noise of the pump light

In practice, the laser light source as a strong pump light usually has large additional fluctuation noise, which will greatly affect and reduce the fidelity of the frequency conversion of the continuous variable light field quantum state

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