Wigner tomography of two qubit states and quantum cryptography

Simple item page
dc.creatorDurt, T.
dc.creatorLamas-Linares, A.
dc.creatorLing, A.
dc.creatorKurtsiefer, C.
dc.date2008-05-31
dc.date.accessioned2026-07-07T12:14:38Z
dc.date.available2026-07-07T12:14:38Z
dc.descriptionTomography of the two qubit density matrix shared by Alice and Bob is an essential ingredient for guaranteeing an acceptable margin of confidentiality during the establishment of a secure fresh key through the Quantum Key Distribution (QKD) scheme. We show how the Singapore protocol for key distribution is optimal from this point of view, due to the fact that it is based on so called SIC POVM qubit tomography which allows the most accurate full tomographic reconstruction of an unknown density matrix on the basis of a restricted set of experimental data. We illustrate with the help of experimental data the deep connections that exist between SIC POVM tomography and discrete Wigner representations. We also emphasise the special role played by Bell states in this approach and propose a new protocol for Quantum Key Distribution during which a third party is able to concede or to deny A POSTERIORI to the authorized users the ability to build a fresh cryptographic key.
dc.identifierhttps://arxiv.org/abs/0806.0272
dc.identifierhttp://arxiv.org/abs/0806.0272
dc.identifierPhys. Rev. A 78, 042338 (2008)
dc.identifierdoi:10.1103/PhysRevA.78.042338
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211259
dc.subjectQuantum Physics
dc.titleWigner tomography of two qubit states and quantum cryptography
dc.typetext

Files

Collections

arXiv