Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 22: Quantenkoh
ärenz und Quanteninformationssysteme I
TT 22.10: Vortrag
Mittwoch, 10. März 2004, 16:45–17:00, H19
Towards mechanical entanglement in nano-electromechanical devices — •Jens Eisert1, Martin B. Plenio2, and Sougato Bose3,4 — 1Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany — 2QOLS, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK — 3Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK — 4Institute for Quantum Information, California Institute of Technology, Pasadena, CA 91125, USA
We study arrays of mechanical oscillators in the quantum domain and demonstrate how the motions of distant oscillators can be entangled without the need for control of individual oscillators and without a direct interaction between them. These oscillators are thought of as being members of an array of nano-electromechanical resonators with a voltage being applicable between neighbouring resonators. Sudden switching of the interaction results in a squeezing of the states of the mechanical oscillators, leading to an entanglement transport in chains of mechanical oscillators. We discuss the spatial dimensions, Q-factors, and temperatures that would be necessary to achieve entanglement in the canonical coordinates in such a scheme, and discuss decoherence mechanisms in some detail, and find a distinct robustness of the scheme under decoherence. We also briefly discuss the challenging aspect of detection of the generated entanglement.