Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 82: Quantum dots and wires: Cavities and photons
HL 82.1: Talk
Thursday, March 14, 2013, 15:00–15:15, H2
Qubit-cavity entanglement created with surface-acoustic waves — •Ralf Blattmann1, Hubert Krenner1, Sigmund Kohler2, and Peter Hänggi1 — 1Institut für Physik, Universität Augsburg, 86159 Augsburg, Germany — 2Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain
We study the quantum dynamics of an exciton qubit in a quantum dot coupled to an optical nano cavity defined in a two-dimensional photonic crystal membrane. The effective interaction between these two systems depends on the cavity length. A surface-acoustic wave (SAW) renders this interaction time-dependent, such that the qubit-oscillator setup experiences an ac driving. Close to an avoided crossing of the adiabatic spectrum, the induced qubit excitations can be transferred via Landau-Zener transitions to the cavity, which allows one to entangle and disentangle cavity and qubit. We investigate the influence of higher harmonics of the SAW as well as decoherence due to photon losses. Additionally, we identify regimes with maximal entanglement and discuss the experimental feasibility. Work supported by SFB 631.