Controlling a mesoscopic spin environment by quantum bit manipulation

Abstract

We present a unified description of cooling and manipulation of a mesoscopic bath of nuclear spins via coupling to a single quantum system of electronic spin (quantum bit). We show that a bath cooled by the quantum bit rapidly saturates. Although the resulting saturated states of the spin bath (``dark states'') generally have low degrees of polarization and purity, their symmetry properties make them a valuable resource for the coherent manipulation of quantum bits. Specifically, we demonstrate that the dark states of nuclear ensembles can be used to coherently control the system-bath interaction and to provide a robust, long-lived quantum memory for qubit states.

4 pages, 3 figures

References in corpus (6)

• Electron spin decoherence in quantum dots due to interaction with nuclei
• Cooling the Collective Motion of Trapped Ions to Initialize a Quantum Register
• Long-lived memory for mesoscopic quantum bits
• Electron spin evolution induced by interaction with nuclei in a quantum dot
• Optical pumping of quantum dot nuclear spins
• Dynamic nuclear polarization at the edge of a two-dimensional electron gas

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