International Conference on Quantum Physics of Nature (QuPoN 2015) Mitschnitt einer Veranstaltung der Fakultät für Physik am Dienstag, dem 19. Mai 2015 im Großen Festsaal der Universität Wien Teil 11. Rainer Blatt: "Quantum information science with trapped Ca+ ions" Schnitt: Daniel Winkler Abstract: In this talk, the basic tool box of the Innsbruck quantum information processor based on a string of trapped Ca+ ions will be reviewed. For quantum information science, the toolbox operations are used to encode one logical qubit in entangled states distributed over seven trapped-ion qubits. We demonstrate the capability of the code to detect one bit flip, phase flip or a combined error of both, regardless on which of the qubits they occur. Furthermore, we apply combinations of the entire set of logical single-qubit Clifford gates on the encoded qubit to explore its computational capabilities. The quantum toolbox is further applied to carry out both analog and digital quantum simulations. The basic simulation procedure will be presented and its application will be discussed for a variety of spin Hamiltonians. Finally, the quantum toolbox is applied to investigate the propagation of entanglement in a quantum many-body system represented by long chains of trapped-ion qubits. Using the ability to tune the interaction range in our system, information propagation is observed in an experimental regime where the effective lightcone picture does not apply. These results will enable experimental studies of a range of quantum phenomena, including transport, thermalization, localization and entanglement growth, and represent a first step towards a new quantum-optic regime of engineered quasiparticles with tunable nonlinear interactions. Rainer Blatt ist Professor am Institut für Experimentalphysik der Universität Innsbruck und Wissenschaftlicher Direktor des Instituts für Quantenoptik und Quanteninformation (IQOQI) der ÖAW. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Quantum information processor with trapped Ca+ ions 00:00:12 3. Topological encoding of a quantum bit 00:13:49 4. Quantum simulations with spin chains 00:25:45 5. CQED experiments with trapped Ca+ ions 00:33:06

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