Complete physical simulation of the entangling-probe attack on the BB84 protocol

Details Complete physical simulation of the entangling-probe attack on the BB84 protocol Complete physical simulation of the entangling-probe attack on the BB84 protocol

2006-11-23

arxiv.org/abs/quant-ph/0611235v1

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevA.75.042327

We have used deterministic single-photon two qubit (SPTQ) quantum logic to implement the most powerful individual-photon attack against the Bennett-Brassard 1984 (BB84) quantum key distribution protocol. Our measurement results, including physical source and gate errors, are in good agreement with theoretical predictions for the Renyi information obtained by Eve as a function of the errors she imparts to Alice and Bob's sifted key bits. The current experiment is a physical simulation of a true attack, because Eve has access to Bob's physical receiver module. This experiment illustrates the utility of an efficient deterministic quantum logic for performing realistic physical simulations of quantum information processing functions.

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