Double quantum dot turnstile as an electron spin entangler
Abstract
We study the conditions for a double quantum dot system to work as a reliable electron spin entangler, and the efficiency of a beam splitter as a detector for the resulting entangled electron pairs. In particular, we focus on the relative strengths of the tunneling matrix elements, the applied bias and gate voltage, the necessity of time-dependent input/output barriers, and the consequence of considering wavepacket states for the electrons as they leave the double dot to enter the beam splitter. We show that a double quantum dot turnstile is, in principle, an efficient electron spin entangler or entanglement filter because of the exchange coupling between the dots and the tunable input/output potential barriers, provided certain conditions are satisfied in the experimental set-up.
Cite
@article{arxiv.cond-mat/0307024,
title = {Double quantum dot turnstile as an electron spin entangler},
author = {Xuedong Hu and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/0307024},
year = {2009}
}
Comments
published version; minor error corrected