A joint team led by Professor Yasuhiko Arakawa of NanoQuine and collaborating organizations Fujitsu Laboratories and NEC has succeeded in the world’s longest quantum cryptographic key transmission of 120 km using a single photon source. This was achieved by developing a quantum cryptosystem optimized for single photon sources, based on the development of the purest single photon sources and the use of highly sensitive superconducting single photon detectors. This transmission distance can cover a large metropolitan area, and is expected to give impetus to the practical application of the single-photon source method for ultimate confidential communication, which is easy to operate and manage. The paper was published in Scientific Reports on 25 September (UK time).
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