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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.27: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

exact entanglement dynamics under the influence of a common structured environment using HOPS — •Richard Hartmann and Walter T. Strunz — Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany

Open quantum systems have to be considered as the general case when examining quantum mechanics experimentally or its technical applications. Therefore the computation of the so called reduced dynamics gains interest in many areas of physics, although no exact and efficient method has been developed yet. Especially when dealing with strong system-bath interactions the "hierarchy of pure states" (HOPS) [1] promises an interesting approach to estimate the exact non Markovian reduced dynamics.

Motivated by the vast progress in implementing qubits in solid state nano devices, we focus in this work on the entanglement dynamics of two non interacting qubits coupled to a common sub-ohmic bosonic bath. Questions such as entanglement decay and sudden death of entanglement as well as entanglement creation are addressed by comparing the exact numeric results gained using HOPS with approximative results employing the Redfield master equation and a second order week coupling expansion of the non Markovian quantum state diffusion equation [2].

[1] D. Süss, A. Eisfeld, and W.T. Strunz, Phys. Rev. Lett. 113, 150403 (2014).

[2] L. Diósi, N. Gisin, W.T. Strunz, Phys. Rev. A 58, 1699--1712 (1998).