A mesoscopic quantum eraser
Universität GH Essen - Fachbereich 7, D-45117 Essen, Germany
2 MPI für Kernphysik - D-69029 Heidelberg, Germany
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