A commercial QKD system inside a licensed research reactor encrypted reactor data at up to 320 kbps, with 82-140 km distances simulated by attenuators and a delay line.
Quantum Key Distribution with High Loss: Toward Global Secure Communication
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We propose a decoy-state method to overcome the photon-number-splitting attack for Bennett-Brassard 1984 quantum key distribution protocol in the presence of high loss: A legitimate user intentionally and randomly replaces signal pulses by multi-photon pulses (decoy-states). Then they check the loss of the decoy-states. If the loss of the decoy-states is abnormally less than that of signal pulses, the whole protocol is aborted. Otherwise, to continue the protocol, they estimate loss of signal multi-photon pulses based on that of decoy-states. This estimation can be done with an assumption that the two losses have similar values, that we justify.
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Demonstration of Quantum-Secure Communications in a Nuclear Reactor
A commercial QKD system inside a licensed research reactor encrypted reactor data at up to 320 kbps, with 82-140 km distances simulated by attenuators and a delay line.