Nature 351, 111 - 116 (09 May 1991); doi:10.1038/351111a0

Quantum optical tests of complementarity

Marian O. Scully, Berthold-Georg Englert & Herbert Walther

Center for Advanced Studies and Physics and Astronomy Department, University of New Mexico, Albuquerque, New Mexico 87131, USA, and at the Max-Planck-Institut für Quantenoptik, D-8046 Garch-ing bei München, Germany. M.O.S. is supported by the Office of Naval Research.
Max-Planck-Institut für Quantenoptik and the Sektion Physik, Universiätat München, 8046 Garching, Germany.

Simultaneous observation of wave and particle behaviour is prohibited, usually by the position–momentum uncertainty relation. New detectors, constructed with the aid of modern quantum optics, provide a way around this obstacle in atom interferometers, and allow the investigation of other mechanisms that enforce complementarity.

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