Debmalya Das (Harish-Chandra Research Institute, Allahabad, India)

Title: The Quantum Chesire Cat: some new aspects and possibilities

Abstract: Quantum Chesire Cat is a counterintuitive phenomenon that provides a new window into the nature of the quantum systems in relation to multiple degrees of freedom associated with a single physical entity. Under suitable pre and postselections, a photon (the cat) can be decoupled from its circular polarization (its grin). In this talk, we will explore whether the grin without the cat can be teleported to a distant location. This will be a totally disembodied teleportation protocol. Based on the original Quantum Chesire Cat setup, we design a protocol where the circular polarization is successfully teleported between two spatially separated parties even though the photon is not physically present with them. The process raises questions in our understanding about properties of quantum system. We further demonstrate this by swapping the grins of two Quantum Chesire Cats. We also briefly discuss about a few interesting new aspects of the original Quantum Chesire Cat protocol.