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Title: Daylight operation of a free space, entanglement-based quantum key distribution system
Keywords: Daylight, cryptography, entanglement, quantum, free-space, communication
Issue Date: 14-May-2009
Citation: MATTHEW PELOSO (2009-05-14). Daylight operation of a free space, entanglement-based quantum key distribution system. ScholarBank@NUS Repository.
Abstract: It has been shown that the security claims about QKD are stronger when a source of entangled photons is used to distribute the key. Previously, an implementation of an entanglement-based QKD protocol distributed over a free space optical channel has only been successful at night, since the key information is extracted from single photons which are not easily distinguished from the large background of sunlight in the channel during daytime. This thesis presents the experimental set up, procedure, and data, resulting in the first demonstration of an experimental quantum cryptographic protocol based on entangled photon sources, which operates in daylight conditions over a free space channel. An average of 385 bits of key per second are generated resulting in more than 65 Mbits of final key. Over the whole period the rate of detected pairs and background events varied by about 2 orders of magnitude.
Appears in Collections:Master's Theses (Open)

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