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Phys. Rev. Lett. 103, 200503 (2009) [4 pages]

Realization of Universal Ion-Trap Quantum Computation with Decoherence-Free Qubits

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T. Monz1, K. Kim1,*, A. S. Villar1,2,†, P. Schindler1, M. Chwalla1, M. Riebe1, C. F. Roos2, H. Häffner2,‡, W. Hänsel1, M. Hennrich1, and R. Blatt1,2
1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria

Received 3 September 2009; published 13 November 2009

See accompanying Physics Synopsis

Any residual coupling of a quantum computer to the environment results in computational errors. Encoding quantum information in a so-called decoherence-free subspace provides means to avoid these errors. Despite tremendous progress in employing this technique to extend memory storage times by orders of magnitude, computation within such subspaces has been scarce. Here, we demonstrate the realization of a universal set of quantum gates acting on decoherence-free ion qubits. We combine these gates to realize the first controlled-NOT gate towards a decoherence-free, scalable quantum computer.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.200503
DOI:
10.1103/PhysRevLett.103.200503
PACS:
03.67.Lx, 32.80.Qk, 37.10.Ty

*Current Address: University of Maryland, MD, 20742, USA.

†Current Address: University of Erlangen-Nürnberg, 91058 Erlangen, Germany.

‡Current Address: University of California, Berkeley, CA 94720-7300, USA.

 
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