Quantum Cheshire Cats
Yakir Aharonov, Daniel Rohrlich, Sandu Popescu, Paul Skrzypczyk
TL;DR
This paper demonstrates a quantum phenomenon where a photon (the 'cat') and its circular polarization (the 'grin') are separated spatially using pre- and post-selection techniques.
Contribution
It introduces the concept of a quantum Cheshire Cat, showing how a particle and its property can be found in different locations.
Findings
Photon and its polarization can be spatially separated.
Pre- and post-selection enable this separation.
Experimental setup confirms the phenomenon.
Abstract
In this paper we present a quantum Cheshire Cat. In a pre- and post-selected experiment we find the Cat in one place, and its grin in another. The Cat is a photon, while the grin is its circular polarization.
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