Photonic quantum information and quantum walks

Broome, Matthew A. (2012). Photonic quantum information and quantum walks PhD Thesis, School of Mathematics and Physics, The University of Queensland.

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Author Broome, Matthew A.
Thesis Title Photonic quantum information and quantum walks
School, Centre or Institute School of Mathematics and Physics
Institution The University of Queensland
Publication date 2012
Thesis type PhD Thesis
Supervisor Andrew White
Alessandro Fedrizzi
Marcelo Almeida
Till Weinhold
Total pages 162
Total colour pages 43
Total black and white pages 119
Language eng
Subjects 020604 Quantum Optics
020503 Nonlinear Optics and Spectroscopy
020603 Quantum Information, Computation and Communication
Abstract/Summary Controlling quantum states of light is of central importance to many fields of modern physics. The technology to do so underpins the only feasible means for long-distance quantum communication using quantum-key-distribution, and plays a pivotal role in the application of quantum computing, quantum metrology and investigations of fundamental physics. Motivated by these applications, in this thesis we present a number of experimental results that demonstrate an enhanced level of control over photonic states. First, we tackle one of the most important technological issues currently facing the field, namely the creation of pure multi-photon Fock states from pulsed parametric downconversion. Our technique shows a marked improvement over previous photon sources when employed for quantum information tasks. At a more foundational level, we experimentally examine the properties of quantum correlations in the temporal domain, where our results highlight surprising differences between its spatial-domain counterpart of multipartite entanglement. Finally, we experimentally implement single- and multi-photon quantum walks in the discrete- and continuous-time regimes respectively. Quantum walks have received much attention in recent years due to their vast applicability in quantum information science, especially for quantum simulation and emulation. On this front we use the quantum walk formalism to perform a full experimental simulation of topological phases in a 1-dimensional configuration. Aside from being the first demonstration of topological phases in this regime, our system exhibits unprecedented control over the topological properties in a quantum system. As such we are able to observe the exotic behaviour of trapped bound states, and discover the new phenomenon of paired bound states—a feature unique to periodically driven systems.
Keyword Photonics
Quantum walks
Quantum optics
Single photons
Quantum information

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Created: Thu, 20 Dec 2012, 12:07:08 EST by Matthew Broome on behalf of Scholarly Communication and Digitisation Service