Quantum cryptographic entangling probe implementation

Howard E. Brandt

doi:10.1117/12.602141

25 May 2005 Quantum cryptographic entangling probe implementation

Howard E. Brandt

Proceedings Volume 5815, Quantum Information and Computation III; (2005) https://doi.org/10.1117/12.602141
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

For a general entangling probe attacking the BB84 protocol in quantum key distrobution, I show that the simplest quantum circuit representing the optimal entangling probe, and yielding the maximum information gain on the pre-privacy-amplified key, consisting of a single CNOT gate in which the control qubit consists of two polarization-basis states of the signal, the target qubit consists of two probe-photon polarization basis states, and the initial state of the probe is set by the error rate induced by the probe. A method is determined for measuring the appropriate correlated state of the probe. Finally, a possible implementation of the entangling probe is described. the device is a simple special-purpose quantum cryptography.

Citation Download Citation

Howard E. Brandt "Quantum cryptographic entangling probe implementation", Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); https://doi.org/10.1117/12.602141

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