Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.75: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Ion chains as quantum reservoirs — •Thomás Fogarty1,2,3, B. G. Taketani1, E. Kajari1, A. Wolf1, Th. Busch3, and G. Morigi1 — 1Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — 2Physics Department, University College Cork, Cork, Ireland — 3Quantum Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
We characterise ion chains as quantum reservoirs, which can mediate entanglement between two objects coupled with the vibrational modes of the chain. The systems which become entangled are the transverse vibrations of two heavy impurity defects, embedded in the ion chain, which couple with the chain axial modes by means of an external optical potential. General scaling properties are verified for large chains, where we demonstrate that entanglement is a stationary feature and does not depend on the finite size of the physical system. We present in detail the effect of the initial squeezing on the entanglement generated and how the entanglement also scales with the distance between the impurities. Finally we analyse the dynamics for small chains, composed of tens of ions, for experimentally relevant parameters such as the initial temperature of the chain.