title: Andreev quantum dots for spin manipulation.
abstract: We investigate the feasibility of manipulating individual spin in a superconducting junction where Bogoliubov quasiparticles can be trapped in discrete Andreev levels. We call this system an Andreev quantum dot (AQD) to be contrasted with a common semiconductor quantum dot. We show that the AQD can be brought into a spin-1/2 state. The coupling between the spin and superconducting current facilitates manipulation and measurement of this state. We demonstrate that one can operate two inductively coupled AQDs as a XOR gate; this enables quantum computing applications.
authors.affiliation: L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, 117940 Moscow, Russia.
authors.forename: Nikolai M
authors.initials: NM
authors.lastname: Chtchelkatchev
authors.forename: Yu V
authors.initials: YV
authors.lastname: Nazarov