Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum information: Atoms and ions IV
Q 28.6: Vortrag
Dienstag, 18. März 2014, 15:15–15:30, UDL HS3038
Observation of the quantum speed-limit: light-cone-like spreading of quantum correlations and beyond — •Petar Jurcevic1,2, Ben P. Lanyon1,2, Cornelius Hempel1,2, Philipp Hauke1, Rainer Blatt1,2, and Christian F. Roos1,2 — 1IQOQI, Technikerstrasse 21a, 6020 Innsbruck, Austria — 2Uni Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
In many-body quantum systems with finite range interactions, the maximum speed at which quantum correlations can propagate in such systems is bounded by the maximal group velocity. This bounded maximal speed predicts a light-cone for quantum correlations spread in space-time. Using a linear chain of trapped ionic qubits, we are able to implement a laser-driven Ising-type Hamiltionian with tunable interaction ranges. Quenching the system locally, we observe for the first time a light-cone like ejection of entangled quasi-particles for short range interaction, where we also proof the entanglement by measuring the tangle between pairs. Furthermore, going to long range interactions we are able to enter regimes where the light-cone like picture starts break down.