Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena
HL 90.1: Poster
Donnerstag, 14. März 2013, 16:00–20:00, Poster A
Strong bipartite and multipartite entanglement from planar microcavities — •Daniel Pagel1, Holger Fehske1, Jan Sperling2, and Werner Vogel2 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17487 Greifswald, Germany — 2Institut für Physik, Universität Rostock, 18051 Rostock, Germany
The emission of entangled light from planar semiconductor microcavities is studied. In doing so, their nonclassical correlations are analyzed and quantified. Entanglement arises due to phase matching of the intracavity scattering dynamics of polaritons for multiple pump beams or pulses. We show, how parametric processes involving the lower polariton branch only, give rise to 2N-partite entangled photons in W states, being the equal-weighted superposition of all pure states with one excited qubit and 2N−1 qubits in the ground state. A second scenario that involves both polariton branches can generate multiple pairs of photons which are frequency entangled. By a decomposition into two parties, their nonclassical correlations can be identified as a bipartite entanglement, which is quantified by Schmidt number witnesses. We discuss to which extent the resources of the originally strongly entangled light field are diminished by dephasing in propagation channels.