Correlating more than two particles in quantum mechanics
Résumé
A few years ago, Greenberger, Horne and Zeilinger showed that quantum non locality effects, already well known for systems of two correlated particles, are more spectacular with three particles or more.\\ For observing these effects, one has to initially put the system in an entangled quantum state that is very specific, and not necessarily easy to produce.\\ We discuss some properties of these states and we propose an experimental scheme which allows to create them by succcessive applications of the postulate of measurement in quantum mechanics.\\ The procedure should in principle allow the creation of the desired correlations in systems containing a relatively large number of particles; we propose to apply it to single paramagnetic ions stored in traps, through the measurement of the rotation of the plane of polarization of a laser beam interacting with the ions (quantized Faraday effect).
Loading...