Hybrid waveguide integrated interferometer and quantum key distribution system

Abstract

The invention discloses a hybrid waveguide integrated interferometer and a quantum key distribution system. The hybrid waveguide integrated interferometer comprises a waveguide chip, a delay device and a reflection module. The waveguide chip comprises a beam splitter, a first waveguide line and a second waveguide line. Since the accuracy of the first waveguide line and the second waveguide line can be controlled at the nanometer level during the manufacture of the waveguide chip, the accuracy of the arm length difference control of the interferometer is higher. The hybrid waveguide integratedinterferometer is small in size and convenient for package vibration isolation and temperature control, so the interferometer is not liable to be affected by the external environment, and the stability is better. The hybrid waveguide integrated interferometer is more stable because the optical waveguide itself has better polarization-maintaining characteristics and the polarization of the opticalpulse is better maintained in the propagation process. The above three aspects make the arm length difference of the hybrid waveguide integrated interferometer easier to control than that of a fiber interferometer, and then make the quantum key distribution system work more stably.

Description

technical field [0001] The invention relates to the technical field of quantum cryptography communication, in particular to a hybrid waveguide integrated interferometer and a quantum key distribution system. Background technique [0002] Quantum key distribution technology combines the principles of quantum physics and modern communication technology. Quantum key distribution uses physical principles to ensure the security of the key negotiation process and results in different places. 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 optical fiber channel. According to the requirements of different quantum key distribution protocols, quantum key distribution equipment uses various optical modulation devices to load classical random bi...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a hybrid waveguide integrated interferometer and a quantum key distribution system to solve the difficult problem in the prior art that the control of the interferometer arm length difference between the sending end and the receiving end is relatively difficult

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