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Phys. Rev. Lett. 62, 2209–2212 (1989)

Two-particle interferometry

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Michael A. Horne
Department of Physics, Stonehill College, North Easton, Massachusetts 02356

Abner Shimony
Department of Philosophy and Department of Physics, Boston University, Boston, Massachusetts 02215

Anton Zeilinger
Atominstitut der Österreichischen Universitäten, Schüttelstrasse 115, A-1020 Vienna, Austria
Physik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of Germany

Received 30 January 1989; published in the issue dated 8 May 1989

An exposition is given of the fundamental ideas of the recently opened field of two-particle interferometry, which employs spatially separated, quantum mechanically entangled two-particle states. These ideas are illustrated by a realizable arrangement, in which four beams are selected from the output of a laser-pumped down-converting crystal, with two beams interferometrically combined at one locus and two at another. When phase shifters are placed in these beams, the coincident count rates at the two loci will oscillate as the phases are varied, but the single count rates will not.

© 1989 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.2209
DOI:
10.1103/PhysRevLett.62.2209
PACS:
03.65.Bz, 42.10.Jd, 42.50.Dv, 42.50.Wm