MONITORING SIGNAL DISTURBANCE; DISTRIBUTION PROTOCOL; SECURITY
NATURE PUBLISHING GROUP
SCIENTIFIC REPORTS, v. 6, Article no. 30036
We study N-dimensional measurement-device-independent quantum-key-distribution protocol where one checking state is used. Only assuming that the checking state is a superposition of other N sources, we show that the protocol is secure in zero quantum-bit-error-rate case, suggesting possibility of the protocol. The method may be applied in other quantum information processing.