In a simple form, Bell's theorem states that: No physical theory of local hidden variables can ever reproduce all of the predictions of quantum mechanics. Bell developed a series of inequalities to provide specific experimental examples to distinguish between the predictions of any theory r...

Schrödinger wrote a letter to Einstein after the 1935 EPR paper, and in that letter Schrödinger used the German word "Verschränkung" which translates into "entanglement", but when was the word first used in English? Schrödinger's 1935 paper written in English, called Discussion of Probability Re...

8 days after activity had stopped on the answer to my question, I got a comment suggesting that there was a flag attempting to delete my answer (!!). The feature request is for me to know when someone has flagged me. Is it possible already to turn on such a notification?

The Toric code Hamiltonian is: $\sum_{x,y}\left( \prod_{i\in p(x,y)} Z_{ixy} + \prod_{i\in v(x,y)} X_{ixy} \right),$ where the $v$ and $p$ are defined according to this picture (courtesy of James Wooton's contribution to Wikipedia): At the moment we have an infinite 2D lattice: $x\rightar...