Andreev Quantum Dots for Spin Manipulation
Nikolai M. Chtchelkatchev, Yu. V. Nazarov
DOI 10.1103/PhysRevLett.90.226806 · Physical Review Letters
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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.
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