A Mesoscopic Quantum Eraser

Details A Mesoscopic Quantum Eraser A Mesoscopic Quantum Eraser

1998-11-13

arxiv.org/abs/cond-mat/9811180v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures, to appear in Europhys. Lett., uses EuroPhys.sty and EuroMacro.tex (included)

Scientific paper

10.1209/epl/i1998-00527-x

Motivated by a recent experiment by Buks et al. [Nature 391, 871 (1998)] 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.

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