The physicists, Yakir Aharonov at Tel Aviv University in Tel Aviv, Israel, and Chapman University in Orange, California, US, and his coauthors have published a paper on quantum Cheshire Cats in a recent issue of the New Journal of Physics.
The physicists begin their paper with an excerpt from Lewis Carroll’s 1865 novel Alice in Wonderland:
‘All right’, said the Cat; and this time it vanished quite slowly, beginning with the end
of the tail, and ending with the grin, which remained some time after the rest of it had
‘Well! I’ve often seen a cat without a grin’, thought Alice, ‘but a grin without a cat!
It’s the most curious thing I ever saw in my life!’
Just as the grin is a property of a cat, polarization is a property of a photon. In their paper, the physicists explain how, “in the curious way of quantum mechanics, photon polarization may exist where there is no photon at all.”
In their proposed experimental set-up, the physicists show that a photon will travel through the left arm of an interferometer with 100% certainty, yet its polarization can be detected in the right arm, where there is 0% probability of the photon traveling. That is, the photon is in one place while its polarization is in another.
Read more at: Phys.org