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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Transport: Quantum coherence and quantum information systems - Theory (TT with HL)

HL 7.9: Talk

Monday, March 16, 2015, 11:45–12:00, H 3005

Robust entanglement under multipartite correlated dephasing — •Edoardo Carnio1,2, Manuel Gessner2, and Andreas Buchleitner2,31Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom — 2Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany — 3Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstraße 19, 79104 Freiburg, Germany

We derive an analytical description for the dephasing process undergone by a system on non-interacting atomic qubits, immersed in a uniform, fluctuating magnetic field. The dephasing process is correlated, as the noise source is common to all the particles and induces an effective atom-atom interaction on them. This correlated nature allows to specify field orientations that preserve any degree of atomic entanglement for all times, and families of states with entanglement properties that are time-invariant for arbitrary field orientations. Our formalism applies to arbitrary spectral distributions of the fluctuations.

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