Time phase quantum key distribution system transmitting end

Abstract

The invention discloses a time phase quantum key distribution system transmitting end. The transmitting end comprises a first semiconductor laser, a circulator, an optical beam splitter, an optical delay line, a phase modulation device, a second semiconductor laser, a third semiconductor laser, an intensity modulator, an optical attenuator and a current driving unit. The first semiconductor laseris connected with the circulator through an optical fiber, the circulator is connected with the optical beam splitter through an optical fiber, the optical beam splitter is connected with the second semiconductor laser through the first optical fiber arm, the first optical fiber arm is provided with an optical delay line, and the optical beam splitter is connected with the third semiconductor laser through the second optical fiber arm. The circulator is connected with the intensity modulator through an optical fiber, and the intensity modulator is connected with the optical attenuator throughan optical fiber; the phase modulation device is arranged on the first optical fiber arm or the second optical fiber arm; the first semiconductor laser, the second semiconductor laser and the third semiconductor laser are all connected with a current driving unit. The quality of the generated optical pulse is better, and the system error code can be reduced.

Description

technical field [0001] The invention belongs to the field of quantum key distribution technology (Quantum Key Distribution QKD), in particular to a transmitter of a time phase quantum key distribution system. Background technique [0002] Quantum cryptography communication combines the principles of quantum physics and modern communication technology. Quantum cryptography communication uses physical principles to ensure the security of the remote key negotiation process and results. Combined with the "one-time pad" encryption technology, it can realize secure communication that does not depend on the complexity of the algorithm. [0003] At present, quantum cryptography technology mainly uses photons as the realization carrier, which is distributed through free space or fiber optic channel. According to the requirements of different quantum key distribution protocols, quantum key distribution equipment uses various optical modulation devices to load classical random bits on...

AI Technical Summary

Problems solved by technology

[0006] To sum up, it is necessary to propose a new type of time-phase QKD system transmitter structure, and use this structure to solve the defect of large system error in the typical QKD system in the prior art

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