Professor Myles Padgett, Kelvin Chair of Natural Philosophy and Vice Principal (Research), University of Glasgow 26 May (3.30pm): ‘Ghost Imaging with Quantum Light’

8 May 2017

Professor Myles Padgett, Kelvin Chair of Natural Philosophy and Vice Principal (Research), University of Glasgow
26 May (3.30pm): ‘Ghost Imaging with Quantum Light’
Martin Wood Lecture Theatre, followed by tea/coffee in the Clarendon Labs Common Room

Ghost imaging and ghost diffraction were first demonstrated by Shih and co-workers using photon pairs created by parametric down-conversion. They were able to obtain an image or a diffraction pattern using photons that had never interacted with the object, relying instead on the correlations with photons that have.

In a typical ghost-imaging configuration, the down-converted photons are directed into two separate optical arms. The object is placed in one arm and a single-pixel “heralding” detector detects the photons transmitted through this object. The signal from this detector triggers a camera positioned in the other arm, which then detects the spatial position of the correlated photon. The image is recovered from the coincidence detection of the two photons.

But what sets the resolution of the resulting images? The resolution of the heralding arm, the resolution of the camera optics, or something else? This talk will present an examination of the resolution limits of the ghost imaging and ghost diffraction. Beyond consideration of these limits, our ghost diffraction is an implementation of Popper’s thought experiment, and while our results agree with his experimental predictions, we show how these results do not contradict the Copenhagen Interpretation.

About the speaker: Miles Padgett holds the Kelvin Chair of Natural Philosophy at the University of Glasgow. He is interested in all things optical both classical and quantum. In 2001 he was elected a Fellow of the Royal Society of Edinburgh (RSE) and in 2014 a Fellow of the Royal Society, the UK's National Academy. In 2009, with Les Allen, he won the Institute of Physics Young Medal, in 2014 the RSE Kelvin Medal, in 2015 the Science of Light Prize from the European Physical Society and in 2017 the Max Born Award of the Optical Society (OSA).