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Title: Integrated photonic continuous-time quantum walks
Author: Poulios, Konstantinos
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2013
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The present thesis describes experimental work on non-classical interference of photons in integrated quantum photonic circuits. This non-classical interference of indistinguishable photons serves as the basis for implementing photonic quantum technologies and its demonstration on integrated platforms sparked a plethora of experimental research. The viability of multi-mode interference (MMI) devices is investigated as an alternative building block for quantum waveguide circuits. The visibility function for non-classical interference of two photons injected into a MMI device is derived theoretically, predicting near unit visibility for compact SiOxNy (SiON) devices. Theoretical results are complemented by experimental demonstration of very high visibilities in 2x2 MMI devices without the requirement of narrow-band photons . Taking advantage of the low de coherence properties of the photons and the inherent stability of integrated waveguide arrays, quantum walks (QWs) of correlated photons are experimentally demonstrated. Non-classical correlated detection events are observed for two photon QWs in an array of 21 evanescently coupled waveguides in a SiON chip. These correlations depend on the input state of the photons and violate a classical limit.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available