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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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