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Title: Universal linear optics : characterisation, verification and computation
Author: Carolan, Jacques
ISNI:       0000 0004 5919 7178
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2015
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Photonic approaches to quantum information science and technology promise new scientific discoveries and new applications. Linear optics underpins all of these protocols, and the advent of integrated quantum photonics has has brought with it a step change in complexity and control over quantum photonic systems. As systems scale up, near-term nonclassical computational possibilities emerge, as does the prospect of practical quantum technologies. In this work we present a series of linear optical processors comprising the union of a multi-photon source, active and passive waveguide devices, and a single photon detection system; and use these systems to explore a multitude of quantum information processing protocols. VYe propose and implement efficient and robust techniques for device level characterisation of linear optical circuitry, where full scale tomographic techniques become intractable. We demonstrate machine level verification protocols for systems whose complexity renders them formally unverifiable, demonstrating the efficacy of our protocols on systems of up to five photons in 21 waveguides, generating Hilbert spaces of 50,000 dimensions. Finally we present a fully reconfigurable universal linear optical processor with sufficient control to implement all possible linear optical protocols up to the size of the circuit. We programme this device to implement heralded quantum logic gates and entangling operations, simultaneous bosons sampling and verification protocols and six dimensional complex Hadamard operations. These results and techniques will find application as large scale universal linear optical processors begin to replace existing and future prototype systems.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available