Singlet-triplet filtering and entanglement in a quantum dot structure.

Giavaras, G. and Jefferson, J. H. and Fearn, M. and Ashley, T. and Lambert, Colin J. (2007) Singlet-triplet filtering and entanglement in a quantum dot structure. Physical review B, 75 (8). 085302. ISSN 1098-0121

Abstract

We consider two interacting electrons in a semiconductor quantum dot structure, which consists of a small dot within a larger dot, and demonstrate a singlet-triplet filtering mechanism which involves spin-dependent resonances and can generate entanglement. By studying the exact time evolution of singlet and triplet states we show how the degree of both filtering and spin entanglement can be tuned using a time-dependent gate voltage.