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Abstract: A which-way measurement in Young-s double-slit will destroy the interferencepattern. Bohr claimed this complementarity between wave- and particle behaviouris enforced by Heisenberg-s uncertainty principle: distinguishing two positionsa distance s apart transfers a random momentum q \sim \hbar-s to the particle.This claim has been subject to debate: Scully et al. asserted that in somesituations interference can be destroyed with no momentum transfer, whileStorey et al. asserted that Bohr-s stance is always valid. We address thisissue using the experimental technique of weak measurement. We measure adistribution for q that spreads well beyond -\hbar-s, \hbar-s, butnevertheless has a variance consistent with zero. This weakvaluedmomentum-transfer distribution P {wv}q thus reflects both sides of thedebate.



Author: R. Mir, J. S. Lundeen, M. W. Mitchell, A. M. Steinberg, J. L. Garretson, H. M. Wiseman

Source: https://arxiv.org/







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