Quantum communication optical path system and quantum communication method

Abstract

The invention provides a quantum communication optical path system and a quantum communication method. The method comprises the steps: at an Alice end, enabling signals to pass through an electro-optic phase modulator at the same time from two directions along a loop, and performing coding through a second polarization beam splitter; under the action of a second polarization beam splitter and a 90-degree Faraday rotator mirror,, enabling the polarization difference between the polarization when the optical signals (namely a first detection optical signal pulse and a second detection optical signal pulse) return to a Bob end through a communication channel and the polarization when the optical signals are emitted from the Bob end to be just 90 degrees, so the optical signals (namely the first detection optical signal pulse and the second detection optical signal pulse) can bypass phase intensity modulation modules (the intensity modulator and the phase modulator) through a first polarization beam splitter to directly reach a PMI polarization-maintaining interference ring, thereby solving the problem of mode crossing of an optical signal loop, and greatly improving the modulation speed of the circuit.

Description

technical field [0001] The present application relates to the field of quantum communication, in particular to a quantum communication optical system and a quantum communication method. Background technique [0002] Quantum communication refers to a new type of communication method that uses quantum entanglement effect to transmit information. In quantum secure communication technology, the most commonly used encoding methods are phase encoding and polarization encoding. Among them, quantum communication based on phase encoding is a secure communication method that can be transmitted stably in optical fibers. [0003] The two-way quantum communication in the quantum communication optical system needs to let the optical signal return along the original path for decoding operation. However, during the optical signal transmission process of the traditional quantum communication optical system, the electro-optical modulator will interfere with the optical signal of the loop, w...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a quantum communication optical system and a quantum communication method for the problem of series mode of the optical signal circuit in the traditional quantum communication optical system

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