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Title: Optical quantum information processing in higher dimensional Hilbert space
Author: Kalasuwan, Pruet
ISNI:       0000 0004 2736 9748
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2012
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In this thesis, we present and demonstrate several schemes for linear optical quantum information processing. Our schemes access. a higher-dimensional Hilbert space in order to simplify some particular quantum information tasks. We show how to expand a polarization-encoded cluster state by accessing and manipulating its spatial degree of freedom. This is realized using a polarization- path controlled-phase gate. We invented a method of adding control to quantum operations by accessing a higher dimensional Hilbert space, significantly reducing the complexity of some quantum circuits. A key advantage of this scheme is that control can be added even to unknown operations. This feature is required in some quantum information applications, such as the phase estimation algorithm, in which the phase is unknown. Using this method, we experimentally demonstrate a number of two-qubit photonic quantum gates, including a CNOT gate, CU gates, and entanglement filters and splitters. Using the same technique, we implemented the complete quantum phase estimation algorithm for a single qubit unitary, and we used the same circuit to realize an eigenstate generator. Our results point the way to efficient quantum simulations and quantum metrology in the near-term, and to large-scale quantum computations in the longer-term.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available