〈 Berger | Dillon 〉

1/ How is the growth of quantum entanglement like a vandalized resistor grid? Short thread on a new paper (https://journals.aps.org/prx/abstract/10.1103/PhysRevX.9.031009 …, open access), which explains how to understand the dynamics of quantum entanglement using classical percolation.pic.twitter.com/f6hKi4ztKH

3/ When two quantum objects are left alone, to evolve under the dynamics arising from their own interactions, they tend to become more entangled. Quantum dynamics usually makes entanglement grow linearly in time, at a rate that depends on the strength of interactions.pic.twitter.com/Eg1fWTheGI

4/ (A detail: you can quantify the degree of entanglement in an information-theoretic way, analogous to the usual entropy. It's something like: if you know half the state, how many additional bits of information do you need to specify the rest of it?)pic.twitter.com/fWap5hanfC

5/ On the other hand, when an outside observer makes measurements on a quantum system, it reduces the entanglement. This is "wave function collapse": after measuring some part of a system, it becomes possible to specify that component's state without reference to anything else.pic.twitter.com/HYEpRb4HOz