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Phys. Rev. Lett. 102, 040501 (2009) [4 pages]

Realization of the Quantum Toffoli Gate with Trapped Ions

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

Received 14 November 2008; published 28 January 2009

Gates acting on more than two qubits are appealing as they can substitute complex sequences of two-qubit gates, thus promising faster execution and higher fidelity. One important multiqubit operation is the quantum Toffoli gate that performs a controlled NOT operation on a target qubit depending on the state of two control qubits. Here we present the first experimental realization of the quantum Toffoli gate in an ion trap quantum computer, achieving a mean gate fidelity of 71(3)%. Our implementation is particularly efficient as the relevant logic information is directly encoded in the motion of the ion string.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.040501
DOI:
10.1103/PhysRevLett.102.040501
PACS:
03.67.Lx, 32.80.Qk, 37.10.Ty

*Present address: Department of Physics and Joint Quantum Institute, University of Maryland, College Park, MD, 20742, USA.

†Present address: Institute of Optics, Information and Photonics, Max Planck Research Group, University of Erlangen-Nuernberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany.

 
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