Attacking quantum key distribution with single-photon two-qubit quantum logic

Details Attacking quantum key distribution with single-photon two-qubit quantum logic Attacking quantum key distribution with single-photon two-qubit quantum logic

2005-08-05

arxiv.org/abs/quant-ph/0508051v2

Physics

Quantum Physics

8 pages, 9 figures; references added, 1 new figure, appendix expanded; accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.73.012315

The Fuchs-Peres-Brandt (FPB) probe realizes the most powerful individual attack on Bennett-Brassard 1984 quantum key distribution (BB84 QKD) by means of a single controlled-NOT (CNOT) gate. This paper describes a complete physical simulation of the FPB-probe attack on polarization-based BB84 QKD using a deterministic CNOT constructed from single-photon two-qubit quantum logic. Adding polarization-preserving quantum nondemolition measurements of photon number to this configuration converts the physical simulation into a true deterministic realization of the FPB attack.

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