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dc.contributor.advisorKorolkova, Natalia
dc.contributor.authorTatham, Richard
dc.coverage.spatial153en_US
dc.date.accessioned2012-09-03T10:17:34Z
dc.date.available2012-09-03T10:17:34Z
dc.date.issued2012-11-30
dc.identifier.urihttp://hdl.handle.net/10023/3060
dc.description.abstractThis thesis explores the role of non-classical correlations in bipartite continuous variable quantum systems, and the approach taken is three-fold. We show that given two initially entangled atomic ensembles, it is possible to probabilistically increase the entanglement between them using a beamsplitter-like interaction formed from two quantum non-demolition (QND) interactions with auxiliary polarised light modes. We then develop an elegant method to calculate density matrix elements of non-Gaussian bipartite quantum states and use this to show that the entanglement in a two mode squeezed vacuum can be distilled using QND interactions and non-Gaussian elements. Secondly, we introduce a potential new measure of quantum entanglement in bipartite Gaussian states. This measure has an operational meaning in quantum cryptography and provides an upper bound on the amount of a secret key that can be distilled from a Gaussian probability distribution shared by two conspirators, Alice and Bob, given the presence of an eavesdropper, Eve. Finally, we go beyond the realm of quantum entanglement to explore other non-classical correlations in continuous variable systems. We provide solutions for a number of these measures on two mode Gaussian states and introduce the Gaussian Ameliorated Measurement Induced Disturbance (GAMID). The interplay between these different measures and quantum entanglement is examined. We then attempt to take small steps into the non-Gaussian regime by computing these non-classicality measures on the three-parameter continuous variable Werner states.en_US
dc.language.isoenen_US
dc.publisherUniversity of St Andrews
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subjectEntanglementen_US
dc.subjectQuantumen_US
dc.subjectNonclassicalityen_US
dc.subjectDiscorden_US
dc.subjectDistillationen_US
dc.subjectGAMIDen_US
dc.subjectMIDen_US
dc.subjectOptimisationen_US
dc.subjectOpticsen_US
dc.subject.lccQC174.17E58T2
dc.subject.lcshQuantum entanglementen_US
dc.titleQuantum correlations in and beyond quantum entanglement in bipartite continuous variable systemsen_US
dc.typeThesisen_US
dc.type.qualificationlevelDoctoralen_US
dc.type.qualificationnamePhD Doctor of Philosophyen_US
dc.publisher.institutionThe University of St Andrewsen_US


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Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
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