Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 22: Quantum Control

FM 22.4: Talk

Monday, September 23, 2019, 17:30–17:45, 3042

Collective dephasing of tripartite Werner states — •Clément Canard, Edoardo Carnio, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany

An improved understanding of the entanglement dynamics of multi-partite quantum states coupled to a noisy environment is an indispensable prerequisite for scalable quantum information processing. As a specific example, we consider the fate of highly symmetric, three-partite Werner states [1,2] under structural perturbations of their rotational symmetry, and subsequently investigate the robustness of their entanglement properties under collective dephasing, as a ubiquitous source of decoherence e.g. in ion trap experiments.

[1] Werner, R.F. Quantum states with Einstein-Podolsky-Rosen correlations admitting a hidden-variable model. Phys. Rev. A 40, 4277 (1989).

[2] Eggeling, T. & Werner, R. F. Separability properties of tripartite states with U⊗U⊗U symmetry. Phys. Rev. A 63, 042111 (2001).