2018
DOI: 10.1007/s11128-018-2027-2
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Abstract: AbstractWe give a security proof of the 'round-robin differential phase shift' (RRDPS) quantum key distribution scheme, and we give a tight bound on the required amount of privacy amplification. Our proof consists of the following steps. We construct an EPR variant of the scheme. We show that the RRDPS protocol is equivalent to RRDPS with basis permutation and phase flips performed by Alice and Bob; this causes a symmetrization of Eve's state. We identify Eve's optimal way of coupling an ancilla to an EPR qud…

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