Quantum communication system, transmitting end thereof and quantum communication method

Abstract

The invention discloses a quantum communication system, a transmitting end thereof and a quantum communication method. An initial laser signal is emitted at a transmitting end through the same laser;the consistency of laser pulses is ensured; the polarization state of the laser pulse in the laser signal emitted by the emitting end is controlled; the polarization states of two adjacent laser pulses are different, the transmission paths of the laser pulses in different polarization states can be conveniently controlled at a receiving end, and when the laser pulses in different polarization states interfere with each other, the utilization of 100% interference energy can be realized, the energy loss is avoided, and the energy utilization rate and the code rate are improved. Therefore, according to the quantum communication system and the quantum communication method provided by the technical scheme of the invention, the energy utilization rate, the safety and the code forming rate are improved, and popularization and application of the quantum communication system and the quantum communication method are facilitated.

Description

technical field [0001] The present invention relates to the technical field of optical communication, and more specifically, relates to a quantum communication system, a transmitting end thereof, and a quantum communication method. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) technology can generate a completely consistent unconditional security key between the two parties in communication, so it has attracted extensive attention. The fundamental difference between Quantum Key Distribution (QKD) and the classical key system is that it uses a single photon or entangled photon pair as the carrier of the key, which is based on the three basic principles of quantum mechanics (Heisenberg’s uncertainty principle, Measurement collapse theory, quantum non-cloning law) ensure the uneavesdropping and undecipherability of the process, thus providing a more secure key system. [0003] Since the proposal of the BB84 scheme in 1984, various theor...

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Problems solved by technology

[0004] In the prior art, the quantum communication system and quantum communication method still have the problems of low energy utilization rate and low coding rate, and the security still needs to be improved, which is inconvenient Popularization and application of quantum communication systems and quantum communication methods

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