Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Quantum Dynamics, Decoherence and Quantum Information II

DY 3.3: Vortrag

Montag, 11. März 2013, 15:30–15:45, H39

Creation and protection of entangled states through local operations and a non-Markovian environment — •Rebecca Schmidt, Jürgen T. Stockburger, and Joachim Ankerhold — Institut für Theoretische Physik, Universität Ulm, Albert Einstein-Allee 11, 89069 Ulm

Local operations alone cannot create entanglement. Dissipation normally has a destructive effect on entangled states. Suprisingly, the combined effect of local operations and dissipation can create and preserve entanglement for suitably chosen protocols. Building on recent techniques for the optimal control theory of open quantum systems [1], we show how to entangle two noninteracting harmonic oscillators under the influence of local operations and a ’mutual drag’ induced by the environment. Even though the latter effect inevitably exposes the system to reservoir noise (mandated by the fluctuation-dissipation theorem), entanglement is created and maintained. Our use of stochastic Liouville-von Neumann equations [2] for the reduced system dynamics guarantees consistency with a physical reservoir model for arbitrarily strong/fast driving.
R. Schmidt, A. Negretti, J. Ankerhold, T. Calarco and J.T. Stockburger, PhysRevLett 107,130404(2011)
J.T. Stockburger and H. Grabert, PhysRevLett 88,170407(2002)