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Q: Fachverband Quantenoptik und Photonik

Q 33: Quantum Effects: Entanglement and Decoherence I

Q 33.1: Talk

Wednesday, March 2, 2016, 11:00–11:15, f442

Ancilla-assisted preparation of steady-state entanglement — •Joachim Fischbach and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

The dissipative creation of entanglement is a promising field of research, that has seen many theoretical advances as well as experimental verifications in the last years. Dissipatively preparing an entangled state is not only an every day task for protocols in quantum information theory, but also bears interesting fundamental questions about how decoherence can counter-intuitively lead to entanglement. In our work [1], we show how the bipartite entanglement in a system of two two-level systems can be enhanced by coupling it with a dissipative ancilla. The steady-state is furthermore analyzed in terms of the eigenstates of the Hamiltonian, describing system and ancilla without environment. In this picture we are able to give an explanation for the enhancement effect. This could not only be used for practical purposes, like preparing entangled states, but also for further research of how engineered environments can be used for dissipative state preparation.

[1] J. Fischbach, M. Freyberger, Phys. Rev. A 92, 052327 (2015)