Topical Review: Optimum Probe Parameters for Entangling Probe in Quantum Key Distribution
Quantum Information Processing
Bounds on Shannon distinguishability in terms of partitioned measures
Quantum Information Processing
Efficient quantum private comparison employing single photons and collective detection
Quantum Information Processing
Multiparty quantum key agreement with single particles
Quantum Information Processing
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The quantum circuit and design are presented for an optimized entangling probe attacking the BB84 Protocol of quantum key distribution (QKD) and yielding maximum information to the probe. Probe photon polarization states become optimally entangled with the signal states on their way between the legitimate transmitter and receiver. Although standard von-Neumann projective measurements of the probe yield maximum information on the pre-privacy amplified key, if instead the probe measurements are performed with a certain positive operator valued measure (POVM), then the measurement results are unambiguous, at least some of the time. It follows that the BB84 (Bennett---Brassard 1984) protocol of quantum key distribution has a vulnerability similar to the well-known vulnerability of the B92 (Bennett 1992) protocol