A hybrid waveguide integrated interferometer and quantum key distribution system

Abstract

The present application discloses a hybrid waveguide integrated interferometer and a quantum key distribution system. The hybrid waveguide integrated interferometer includes a waveguide chip, a delayer, and a reflection module. The waveguide chip includes a beam splitter, a first waveguide, and a second waveguide. On the one hand, since the precision of the waveguide chip to form the first waveguide and the second waveguide can be controlled at the nanometer level, the control accuracy of the arm length difference of the interferometer is higher. On the other hand, the hybrid waveguide integrated interferometer is extremely small, which is convenient for package vibration isolation and temperature control, so it is not easily affected by the external environment and has better stability; on the other hand, the optical waveguide itself has good polarization maintaining characteristics, and the optical The polarization of the pulse is better preserved during propagation, so the hybrid waveguide-integrated interferometer is more stable. The above three aspects make it easier to control the arm length difference of the hybrid waveguide integrated interferometer compared to the fiber interferometer, which in turn makes the quantum key distribution system work more stable.

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...

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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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