Dephasing due to Which Path Detector
Quantum Physics
2009-10-30 v1 Mesoscale and Nanoscale Physics
Abstract
We study dephasing of electrons induced by a which path detector and thus verify Bohr's complementarity principle for fermions. We utilize a double path interferometer with two slits, with one slit being replaced by a coherent quantum dot (QD). A short one dimensional channel, in the form of a quantum point contact (QPC), in close proximity to the QD, serves as a which path detector. We find that by varying the properties of the QPC detector we affect the visibility of the interference, inducing thus dephasing. We develop a simple model to explain the dephasing due to the nearby detector and find good agreement with the experiment.
Keywords
Cite
@article{arxiv.quant-ph/9709022,
title = {Dephasing due to Which Path Detector},
author = {E. Buks and R. Schuster and M. Heiblum and D. Mahalu and V. Umansky},
journal= {arXiv preprint arXiv:quant-ph/9709022},
year = {2009}
}
Comments
8 pages, 3 figures