Hybrid entanglement for quantum communication

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dc.contributor.authorNape, Isaac Mphele
dc.date.accessioned2018-02-19T12:44:08Z
dc.date.available2018-02-19T12:44:08Z
dc.date.issued2017
dc.descriptionA dissertation submitted to the Faculty of Science in partial fulfillment of the requirements for the Degree of Master of Science School of Physics University of Witwatersrand November 1, 2017en_ZA
dc.description.abstractThe generation and detection of entangled photons is a topic of interest in quantum communication. With current state-of-the-art methods it is possible to manipulate any degree of freedom (DoF) of photons, e.g, polarisation, transverse momentum, orbital angular momentum and energy. Furthermore, it is possible to combine these DoF to realise hybrid entanglement { entanglement between the DoF of photons. In this dissertation we focus on hybrid entanglement between photon states of coupled orbital angular momentum and polarisation. We engineer hybrid-entanglement using geometric phase control between spatially separated photons produced from spontaneous parametric down conversion. We present a new type of quantum eraser that does not rely on physical path interference. We show that in principle any other degree of freedom can be used and demonstrate this e ectively through polarisation control. The use of high dimensional hybrid photon states in quantum communication, particularly in quantum cryptography, is still in its infancy. Here we tailor photon states that are coupled in their polarisation and spatial DoF (orbital angular momentum) to realise high dimensional encoding alphabets. We show how photons entangled in their internal DoF can be generated and deterministically detected. We exploit them in a demonstration of a high dimensional quantum key distribution protocol and show that our scheme generates secure keys at high rates.en_ZA
dc.description.librarianMT 2018en_ZA
dc.format.extent
dc.format.extentOnline resource (xii, 115 leaves)
dc.identifier.citationNape, Isaac Mphele (2017) Hybrid entanglement for quantum communication, University of the Witwatersrand, Johannesburg, <http://hdl.handle.net/10539/24025>
dc.identifier.urihttps://hdl.handle.net/10539/24025
dc.language.isoenen_ZA
dc.subject.lcshPhotons
dc.subject.lcshQuantum communication
dc.titleHybrid entanglement for quantum communicationen_ZA
dc.typeThesisen_ZA
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