Japanese Nippon Telegraph and Telephone Corp. (NTT) has successfully demonstrated the quantum cryptography with a single photon can be realised in the photonic network of optical fibres. The quantum cryptography is expected to be the last resort of the cryptography protocol, and to enhance enormously the safety of transmitting information.

The result was enabled by combining the original protocol of the quantum cryptography developed by the collaboration of NTT and Stanford University (USA) and the NTT developed optical switch to control the flow of photons.

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