Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum effects: Entanglement and decoherence II
Q 66.1: Gruppenbericht
Freitag, 22. März 2013, 14:00–14:30, A 310
Entanglement between two defects mediated by a surrounding chain — •Bruno G. Taketani1, Thomás Fogarty2, Endre Kajari1, Pierre Wendenbaum1,3, Alexander Wolf1, Dragi Karevski3, Thomas Busch2, and Giovanna Morigi1,4 — 1Universität des Saarlandes, Saarbrücken, Germany — 2University College Cork, Cork, Ireland — 3Université de Lorraine, Nancy, France — 4Universitat Autònoma de Barcelona, Bellaterra, Spain
Bath-mediated entanglement between two objects refers to the generation of entanglement between two physical systems which originates from the coupling with a common reservoir. Examples have been reported showing situations where the generated entanglement is stationary. An open question is how stationary entanglement, generated by the coupling with a bath scales with the distance between the objects. We consider this question by analysing two impurity defects embedded in a crystal structure, like an array of ions in a Paul trap. Entanglement is found for sufficiently cold chains and for a certain class of initial, separable states of the defects. It results from the interplay between localized modes which involve the defects and the interposed ions, it is independent of the chain size, and decays slowly with the distance between the defects. These dynamics can be observed in systems exhibiting spatial order: viable realizations are optical lattices, optomechanical systems, or cavity arrays in circuit QED.
These studies are then extended to the case in which instead of oscillators one considers a spin chain embedding two defect spins.