Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Transport: Quantum Coherence and Quantum Information Systems – Theory (jointly with HL, MA)

TT 7.9: Talk

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

Robust entanglement under multipartite correlated dephasing — •Edoardo Carnio^1,2, Manuel Gessner², and Andreas Buchleitner^2,3 — ¹Department 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.