Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Quantum Information: Atoms and Ions III
Q 39.8: Vortrag
Mittwoch, 10. März 2010, 18:30–18:45, E 214
State-independent experimental test of quantum contextuality with trapped ions — •Gerhard Kirchmair1,2, Florian Zähringer1,2, Rene Gerritsma1,2, Matthias Kleinmann2, Ottfried Gühne2,3, Adan Cabello4, Rainer Blatt1,2, and Christian F. Roos1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation,ÖAW, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria — 3Institut für theoretische Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria — 4Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain
In this talk, I will present the realization of a recent proposal for a state-independent test of quantum contextuality. I will start with a brief overview of a gate mechanism that allows for entangling ions without ground state cooling and experimental results obtained with two ions. Then, I will present recent experiments in which we apply the gate for a quantum non-demolition measurement of two-ion spin correlations. This technique makes it possible to sequentially measure several compatible observables on a single quantum system and to correlate the measurement results. In this way, we have been able to realize a state-independent test of quantum contextuality. The experimental results [1] demonstrate that the observed correlations cannot be explained by non-contextual hidden variable theories.
Kirchmair G. et.al. Nature 460, 494 (2009)