Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/53434
Title: Wigner representation for experiments on quantum cryptography using two-photon polarization entanglement produced in parametric down-conversion
Authors: Casado, A.
Guerra, S.
Plácido Suarez, José 
UNESCO Clasification: 22 Física
Keywords: Downconversion
Inequality
Violation
State
Time
Issue Date: 2008
Publisher: 0953-4075
Journal: Journal of Physics B: Atomic, Molecular and Optical Physics 
Abstract: In this paper, the theory of parametric down-conversion in the Wigner representation is applied to Ekert's quantum cryptography protocol. We analyse the relation between two-photon entanglement and (non-secure) quantum key distribution within the Wigner framework in the Heisenberg picture. Experiments using two-qubit polarization entanglement generated in nonlinear crystals are analysed in this formalism, along with the effects of eavesdropping attacks in the case of projective measurements.
URI: http://hdl.handle.net/10553/53434
ISSN: 0953-4075
DOI: 10.1088/0953-4075/41/4/045501
Source: Journal of Physics B: Atomic, Molecular and Optical Physics [ISSN 0953-4075], v. 41 (4), 045501, (Febrero 2008)
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