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Phys. Rev. A 60, R2618 - R2621 (1999)

Quantum eraser and the decoherence time of a measurement process

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Y. Abranyos1, M. Jakob1,2, and J. Bergou1
1Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10021
2Abteilung für Quantenphysik, Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm/Donau, Germany

Rapid Communication Received 8 January 1998

We propose a which path quantum eraser scheme based on a recent experiment by Eichmann et al. [Phys. Rev. Lett. 70, 2359 (1993)] involving two four-level atoms. We show that the quantum eraser can be used for the detection of the decoherence time of macroscopic or mesoscopic entangled superpositions of pointer states of a meter with one of the two atoms, by the visibility of the interference pattern.


©1999 The American Physical Society

URL: http://link.aps.org/abstract/PRA/v60/pR2618
DOI: 10.1103/PhysRevA.60.R2618
PACS: 03.65.Bz, 32.80.-t, 42.50.-p

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