Issue |
Europhys. Lett.
Volume 44, Number 6, December II 1998
|
|
---|---|---|
Page(s) | 693 - 699 | |
Section | General | |
DOI | https://doi.org/10.1209/epl/i1998-00527-x | |
Published online | 01 September 2002 |
A mesoscopic quantum eraser
1
Universität GH Essen - Fachbereich 7, D-45117 Essen, Germany
2
MPI für Kernphysik - D-69029 Heidelberg, Germany
Received:
29
July
1998
Accepted:
26
October
1998
Motivated by a recent experiment by Buks et al. (Nature 391 (1998) 871) we consider electron transport through an Aharonov-Bohm interferometer with a quantum dot in one of its arms. The quantum dot is coupled to a quantum system with a finite number of states acting as a which-path detector. The Aharonov-Bohm interference is calculated using a two-particle scattering approach for the joint transitions in detector and quantum dot. Tracing over the detector yields dephasing and a reduction of the interference amplitude. We show that the interference can be restored by a suitable measurement on the detector and propose a mesoscopic quantum eraser based on this principle.
PACS: 03.65.Bz – Foundations, theory of measurement, miscellaneous theories (including Aha ronov Bohm effect, Bell inequalities, Berry's phase) / 73.23.-b – Mesoscopic systems / 73.50.Bk – General theory, scattering mechanisms
© EDP Sciences, 1998
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