Quantum cryptography has a quantum channel check

摘要

And a method of establishing a shared secret random cryptographic key between a sender and a receiver using the present invention relates quantum communications channel. [MEANS FOR SOLVING PROBLEMS] The system comprises a communication device 14 of the intended recipient and communication device 12 of the sender. In this embodiment, these devices are configured to support quantum communications for transmitting and receiving, respectively photons in the quantum state of each is designated by a particular polarization of the photons. Devices 12, 14 are connected to each other via an optical fiber communication link 16. This optical fiber communication link 16 functions as a quantum communication channel. The communication device 12 of the sender, is also configured to broadcast radio signals 18 to the public channel. Radio signal 18 may be a communication device 14 of Recipient. [Selection Figure Figure 2