Enabling multi-photon experiments with solid-state emitters: a farewell to downconversion

Loredo Rosillo, Juan (2016). Enabling multi-photon experiments with solid-state emitters: a farewell to downconversion PhD Thesis, School of Mathematics and Physics, The University of Queensland. doi:10.14264/uql.2016.595

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Author Loredo Rosillo, Juan
Thesis Title Enabling multi-photon experiments with solid-state emitters: a farewell to downconversion
School, Centre or Institute School of Mathematics and Physics
Institution The University of Queensland
DOI 10.14264/uql.2016.595
Publication date 2016-08-16
Thesis type PhD Thesis
Supervisor Andrew G. White
Marcelo P. Almeida
Total pages 121
Language eng
Subjects 020604 Quantum Optics
020603 Quantum Information, Computation and Communication
020503 Nonlinear Optics and Spectroscopy
Formatted abstract
Advances in photonics will lead to breakthroughs in technology with a similar impact to that resulted from the development of electronics. At the quantum level, photons exhibit some unique features, such as non-classical correlations and bosonic bunching. The manipulation of these quanta of light foresee the construction of quantum devices capable of outperforming their classical counterparts in the purposes for which they are built. Despite a significant progress in developing quantum technologies, several unsolved issues certainly remain: Efficient quantification of quantum correlations in a system, and manipulation of multiple photons at once, are two of such hurdles to be overcome. In this thesis, we tackle these two issues and present experimental progress towards their solution. We first explore quantum entanglement between two single-photons and its effect on phases appearing on the system's wavefunction. The observed phases revealed an intimate connection between entanglement––a purely quantum phenomena––and geometric and topological structures of abstract manifolds: A special case of geometric phases was found to increase monotonically with the amount of entanglement in the system, thus serving as an alternative measure of quantum correlations. We then employed a system of three single-photons, and two concatenated entangling gates, as the basis of a quantum simulation protocol: A three-particle quantum simulator, mimicking the entangling evolution of two particles, is used to experimentally demonstrate that the overhead in measuring concurrence––a measure of two-particle entanglement––can be significantly reduced down to measuring only two observables. At this point, increasing the number of photons being handled proved extremely difficult; the low efficiency of photon sources based on parametric downconversion––the gold-standard and only source at-the-time used for multi-photon experiments––imposed a hard limit on countrates and hence the number of photons to be manipulated. We thus then focused on overcoming this obstacle: We studied a solid-state emitter and its performance as a multi-photon source. We employed a quantum dot-cavity system to show that streams of tens of indistinguishable single-photons are produced, whose temporal-to-spatial demultiplexing serves as a novel kind of multi-photon source. A three-photon source was then built and employed in the first demonstration of multi-photon interference from a solid-state source: We implemented a BosonSampling device with a source that is between one and two orders-of-magnitude more efficient than its downconversion counterpart. The main limiting factors for scaling to higher photon numbers were identified to be not intrinsic to the solid-state emitter, but determined by low detector efficiencies and the probabilistic nature of the demultiplexing scheme. Future improvements on these limitations are expected to allow the generation of sources with a higher number of single-photons, a task that has to date remained otherwise impossible.
Keyword Photonics
Quantum information
Quantum optics
Solid-state single-photon source
Multi-photon interference

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Created: Thu, 11 Aug 2016, 04:46:52 EST by Juan Loredo Rosillo on behalf of Learning and Research Services (UQ Library)