dc.contributor.author Fisher, Kent dc.date.accessioned 2012-09-28 14:17:08 (GMT) dc.date.available 2012-09-28 14:17:08 (GMT) dc.date.issued 2012-09-28T14:17:08Z dc.date.submitted 2012-09-11 dc.identifier.uri http://hdl.handle.net/10012/7067 dc.description.abstract This thesis deals with the implementation of quantum channels using linear optics. We begin with overviews of some important concepts in both quantum information and quantum optics. First, we discuss the quantum bit and describe the evolution of the states via quantum channels. We then discuss both quantum state and process tomography, methods for how to determine which states and operations we are experimentally implementing in the lab. Second, we discuss topics in quantum optics such the generation of single photons, polarization entanglement, and the construction of an entangling gate. en The first experiment is the implementation of a quantum damping channel, which intentionally can add a specific type and amount of decohering noise to a photonic qubit. Specifically, we realized a class of quantum channels which contains both the amplitude-damping channel and the bit-flip channel, and did so with a single, static, optical setup. Many quantum channels, and some gates, can only be implemented probabilistically when using linear optics and postselection. Our main result is that the optical setup achieves the optimal success probability for each channel. Using a novel ancilla-assisted tomography, we characterize each case of the channel, and find process fideilities of $0.98 \pm 0.01$ for the amplitude-damping channel and $0.976 \pm 0.009$ for the bit-flip. The second experiment is an implementation of a protocol for quantum computing on encrypted data. The protocol provides the means for a client with very limited quantum power to use a server's quantum computer while maintaining privacy over the data. We perform a quantum process tomography for each gate in a universal set, showing that only when the proper decryption key is used on the output states, which is hidden from the server, then the action of the quantum gate is recovered. Otherwise, the gate acts as the completely depolarizing channel. dc.language.iso en en dc.publisher University of Waterloo en dc.subject quantum information en dc.subject quantum optics en dc.title Implementing quantum gates and channels using linear optics en dc.type Master Thesis en dc.pending false en dc.subject.program Physics en uws-etd.degree.department Physics and Astronomy en uws-etd.degree Master of Science en uws.typeOfResource Text en uws.peerReviewStatus Unreviewed en uws.scholarLevel Graduate en
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