Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Quantum Information: Atoms and Ions 3

Q 32.1: Vortrag

Mittwoch, 16. März 2011, 14:30–14:45, HÜL 386

Quantum computation and simulation using dissipation — •Philipp Schindler1, Julio T. Barreiro1, Markus Müller2,3, Daniel Nigg1, Thomas Monz1, Michael Chwalla1,2, Markus Hennrich1, Christian F. Roos2, Volckmar Nebendahl3, Peter Zoller2,3, and Rainer Blatt1,21Institut für Experimentalphysik, Universität Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria — 3Institut für Theoretische Physik, Universität Innsbruck, Austria

In quantum information experiments, quantum systems are usually isolated from the environment and their dynamics is controlled coherently. On the other hand, engineering the dynamics of many particles by a controlled coupling to an environment opens new possibilities in quantum information and simulation experiments[1]. We report on several experiments combining the power of multi-qubit quantum gates and dissipative coupling to the environment in a 40Ca+ ion trap quantum computer. For example, quantum error correction requires to dissipatively reset ancilla qubits. For this optical pumping is used thus enabling multiple steps of a quantum-error-correction algorithm. We further demonstrate a toolbox for simulating an open quantum system with up to five qubits exemplified by the dissipative preparation of entangled states. This work offers novel prospects for quantum simulation and computation by adding controlled dissipation to coherent operations.

[1] F. Verstraete, et. al., Nature Phys. 5, 633 (2009)

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