Posts Tagged ‘Entanglement’

15 Entanglement

Wednesday, July 7th, 2010

Quantum entanglement is the notion that two detections of light, understood to be two photons created together in a single compound event, are part of the same phenomenon or event, and that the whole is properly described by a single mathematical function, or ‘wavefunction’.

This much is perfectly reasonable, so far as it goes. However, there is a further argument, dating back to von Neumann, that this means that what you do as an experimenter in measuring one part of this event (detecting one photon) has an effect, instantaneously and at a distance, on the other. There are two ways in which this whole topic is often handled poorly in the physics literature, and these are commonly obscured by the complex and often metaphysical language used. (more…)