title: Electrical measurement of a two-electron spin state in a double quantum dot.
abstract: We propose a scheme for electrical measurement of two-electron spin states in a semiconductor double quantum dot. We calculated the adiabatic charge transfer when surface gates are modulated in time. Because of spin-orbit coupling in the semiconductor, spatial displacement of the electrons causes a total spin rotation. It follows that the expectation value of the transferred charge reflects the relative phase as well as the total spin population of a prepared singlet-triplet superposition state. The precise detection of the charge transfer serves to identify the quantum superposition.
authors: JST-CREST, Saitama 332-0012, Japan.
authors: Nobuhiko
authors: N
authors: Yokoshi
authors: Hiroshi
authors: H
authors: Imamura
authors: Hideo
authors: H
authors: Kosaka