In New Quantum Experiment, Effect Happens Before Cause
The head-scratcher is: the measurement is made before the decision is made, and it is accurate. "Classical correlations can be decided after they are measured," says Xiao-song Ma, the writer of the study. Entanglement can be created "after the entangled particles have been measured and may no longer exist."
The finding can be integrated into potential quantum computers, one hopes. Causality, clearly, is a quaint, irrelevant concept.
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Quantum mechanics allows for some very strange things, like the teleportation of information and computers that can break even the toughest codes. Recently, scientists at the Swiss Federal Institute of Technology (ETH) in Zurich made a step toward building a working quantum computer by teleporting bits of information across a computer chip.
( via popsci.com )