Quantum-enhanced imaging and sensing with spatially correlated biphotons

Toninelli, Ermes (2020) Quantum-enhanced imaging and sensing with spatially correlated biphotons. PhD thesis, University of Glasgow.

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Abstract

In this thesis I discuss the experimental demonstration of quantum-enhanced imaging and sensing schemes able to surpass the performance of their classical counterparts. This is achieved by exploiting the spatial properties of quantum correlated biphotons. Over the next chapters I first discuss the production and detection of quantum correlated photons using a type-I nonlinear crystal and a single-photon sensitive electron-multiplying CCD camera. I then provide a simple yet powerful description of the spatially resolved detection of biphotons, allowing to accurately model and assess the performance of the quantum-enhanced schemes featured in this thesis. These consist of a shadow-sensing and an imaging scheme able to respectively beat the shot-noise-limit in the optical measurement of the position of a shadow and the diffraction limit in the full-field imaging of real-world objects. A combination of simulated and experimental results are used to investigate both the achieved and theoretically available quantum advantage. Optical losses and detector noise are found to limit the better-than-classical performance of the schemes, which rely on the ability to jointly detect an as high as possible number of spatially correlated biphotons.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: quantum enhanced imaging sensing spatially correlated biphotons.
Subjects: Q Science > QC Physics
Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
Funder's Name: Scottish Funding Council (SFC), Engineering and Physical Sciences Research Council (EPSRC)
Supervisor's Name: Padgett, Professor Miles
Date of Award: 2020
Depositing User: Dr Ermes Toninelli
Unique ID: glathesis:2020-80288
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 26 Mar 2020 08:38
Last Modified: 26 Mar 2020 08:38
URI: http://theses.gla.ac.uk/id/eprint/80288
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