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Q: Fachverband Quantenoptik und Photonik

Q 25: Quanteninformation: Konzepte und Methoden 3

Q 25.6: Talk

Tuesday, March 13, 2012, 11:45–12:00, V7.01

Measuring entanglement across a phase transition — •Oliver Marty, Marcus Cramer, and Martin Bodo Plenio — Institute für Theoretische Physik, Universität Ulm, Germany

In a recent experiment [1] an Ising model was simulated with trapped ions and different order parameters were measured across the paramagnetic-ferromagnetic phase transition. We show how entanglement may be quantified across this transition using already available simple measurements only, which are, in particular, exponentially more efficient than full state tomography. The suggested scheme holds the possibility to experimentally address questions of criticality and entanglement in a quantum many-body system.

[1] R. Islam et al., Nat. Commun. 2, 377 (2011).