Path Information in Quantum Interferometry
Ever since the famous Bohr-Einstein dialogue,1 it has been known that it is not possible in an interference experiment to have a maximum visibility interference pattern and path information at the same time. This feature of quantum mechanics, necessary for its consistency, has been elevated by Feynman2 to a principle: whenever it is not possible, not even in principle, to obtain path information, then one has to superpose probability amplitudes instead of adding probabilities for making experimental predictions.
KeywordsEntangle State Interference Fringe Photon Pair Polarize Beam Splitter Order Fringe
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