Device and method for generating photo-communication waveband continuous variable quantum entanglement source

Abstract

The invention provides a device and a method for generating a photo-communication waveband continuous variable quantum entanglement source. The device comprises a photo-communication waveband continuous single-frequency fiber laser, a frequency multiplier, a signal light mode cleaner, a pump light mode cleaner, a dichroic mirror, a total reflection plane mirror with piezoelectric ceramics, a three-resonance non-degeneracy optical parametric amplifier, a crystal temperature controller, a cavity length and phase locking system, a first 45-degree high reflecting plane mirror and a quantum entanglement source detection system. According to the device and the method for generating the continuous variable quantum entanglement source, the device has a compact structure, is high in stability and is matched with the photo-communication waveband; the device adopts a single three-resonance non-degeneracy optical parametric amplifier for directly preparing the photo-communication waveband continuous variable quantum entanglement source, and the transmission loss of the waveband quantum entanglement source in optical fiber is only 0.2dB / km, so that the high fidelity transmission of information is realized; and the device is compatible with the present photo-communication system, so that the quantum entanglement source can become a perfect light source of a practical quantum network.

Description

technical field [0001] The invention relates to the fields of continuous variable quantum optics and quantum information, in particular to a device and method for generating a continuous variable quantum entanglement source in an optical communication band. Background technique [0002] The uniqueness of the quantum entanglement source lies in the fact that the subsystems of a system show non-local correlations, and the observation of one subsystem will inevitably affect the measurement results of other subsystems. Continuously variable quantum entanglement sources have attracted widespread attention due to their unconditional preparation and high detection efficiency, and have been used in the research of quantum state transfer, quantum dense coding and quantum secure communication. The 1.5μm continuous variable quantum entanglement source in the optical communication band has also become an important resource for practical continuous variable quantum information science re...

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Problems solved by technology

However, the above article uses a double-resonance degenerate optical parametric oscillator. The pump light passes through the optical parametric oscillator twice, and its inner cavity power density is low, resulting in a high threshold of the optical parametric oscillator.

Secondly, the above article uses the coupling of squeezed-state light fields output by two optical parametric oscillators to generate quantum entanglement sources. its practical application

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