Quantum Chesire Cat

[fiveworlds]

Found this article http://www.bbc.com/news/science-environment-28543990

There is also this article with heaps of math http://www.nature.com/ncomms/2014/140729/ncomms5492/full/ncomms5492.html

 

About Schrodinger's cat

 

Glimpsing this Cheshire Cat requires what quantum physicists call "weak measurement," whereby you interact with a system so gently that you avoid collapsing it from a quantum state to a classical one.

 

Now according to Schrodinger's cat any measurement should collapse the quantum state.

Edited August 3, 2014 by fiveworlds

[ajb]

Weak measurements are strange, but they do not violate the rules of quantum mechanics as far as I know. You can have a look at Lajos Diosi, Weak measurements in quantum mechanics, arXiv:quant-ph/0505075 (2005), for a brief theoretical overview.