25 May 2005 Quantum cryptographic entangling probe implementation
Author Affiliations +
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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Howard E. Brandt, Howard E. Brandt, } "Quantum cryptographic entangling probe implementation", Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); doi: 10.1117/12.602141; https://doi.org/10.1117/12.602141
PROCEEDINGS
9 PAGES


SHARE
RELATED CONTENT

Quantum cryptography for secure free-space communications
Proceedings of SPIE (April 25 1999)
Quantum repeaters: fundamental and future
Proceedings of SPIE (May 09 2007)
Entangling probes of QKD
Proceedings of SPIE (May 11 2006)
POVM inconclusive rate
Proceedings of SPIE (July 12 2000)
An advanced design of receiver for free space quantum key...
Proceedings of SPIE (November 04 2010)
Information security: from classical to quantum
Proceedings of SPIE (November 18 2012)

Back to Top