When pairs of particles are generated by the decay of other particles, naturally or through induced collision, these pairs may be termed "entangled", in that such pairs often necessarily have linked and opposite [[qualities]] such as spin or charge. The [[assumption]] that measurement in effect "[[creates]]" the [[state]] of the measured quality goes back to the [[arguments]] of [[Einstein]], Podolsky, and Rosen and [http://en.wikipedia.org/wiki/Erwin_Schrodinger Erwin Schrödinger] concerning Heisenberg's [http://en.wikipedia.org/wiki/Uncertainty_principle uncertainty principle] and its [[relation]] to [[observation]] (see also the [http://en.wikipedia.org/wiki/Copenhagen_interpretation Copenhagen interpretation]). | When pairs of particles are generated by the decay of other particles, naturally or through induced collision, these pairs may be termed "entangled", in that such pairs often necessarily have linked and opposite [[qualities]] such as spin or charge. The [[assumption]] that measurement in effect "[[creates]]" the [[state]] of the measured quality goes back to the [[arguments]] of [[Einstein]], Podolsky, and Rosen and [http://en.wikipedia.org/wiki/Erwin_Schrodinger Erwin Schrödinger] concerning Heisenberg's [http://en.wikipedia.org/wiki/Uncertainty_principle uncertainty principle] and its [[relation]] to [[observation]] (see also the [http://en.wikipedia.org/wiki/Copenhagen_interpretation Copenhagen interpretation]). |