"Using four photons, we can actively delay the choice of measurement on two of the photons into the time-like future of the registration of the other two photons. This effectively projects the two already registered photons onto one of two mutually exclusive quantum states in which the photons are either entangled (quantum correlations) or separable (classical correlations). This can also be viewed as ‘quantum steering into the past’." (arXiv, Nature Physics, Ars Technica)
posted by jeffburdges on Apr 25, 2012 - 80 comments

Physicists have managed to observe light behaving both as a particle and wave in the same double-slit experimental condition, by means of a new method to weakly observe a particle's momentum. This article in Nature summarizes the results in non-mathematical terms. [more inside]
posted by leibniz on Jun 3, 2011 - 49 comments

Quantum of culture. Terminology from quantum theory shows up frequently in art, films, poetry and sculpture. Robert P. Crease gauges the impact of quantum mechanics on popular culture. [Via]
posted by homunculus on Oct 27, 2008 - 20 comments

Quantum Mechanics: Myths and Facts (pdf), a recently-updated paper on the Cornell arXiv peer-review site. By Hrvoje Nikolić of the Rudjer Bošković Institute in Croatia. [more inside]
posted by XMLicious on Feb 25, 2008 - 47 comments

Physicists have 'solved' mystery of levitation Professor Ulf Leonhardt and Dr Thomas Philbin, from the University of St Andrews in Scotland, have worked out a way of reversing ... the Casimir force, so that it repels instead of attracts. Their discovery could ultimately lead to frictionless micro-machines with moving parts that levitate. But they say that, in principle at least, the same effect could be used to levitate bigger objects too, even a person.
posted by MythMaker on Aug 19, 2007 - 30 comments

Future of computing - Light or Molecules?
posted by tiaka on Jun 23, 2001 - 5 comments