Quantum entanglement experiment. Lasers being used in an experiment to demonstrate the breakdown of causality in quantum physics. One of the strangest consequences of the quantum theories is that some quantum events can become entangled. Two particles will appear to be linked across space and time, with changes to one of the particles affecting the other one. This is an instantaneous effect that appears to be independent of both space and time, meaning that, in the quantum realm, effect may precede cause. This is part of the work by Gisin, Suarez and Stefanov at the GAP (Group of Applied Physics), the University of Geneva, Switzerland. Photographed in February 2003.