Quantum-enhanced imaging and sensing with spatially correlated biphotons

QC Physics

Toninelli, Ermes ; Scottish Funding Council (SFC) ; Padgett, Miles

University:University of Glasgow

Department:School of Physics and Astronomy

关键词: quantum enhanced imaging sensing spatially correlated biphotons.;   

Others  :  http://theses.gla.ac.uk/80288/1/main.pdf

来源: University of Glasgow

【 摘 要 】

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.