Letter abstract

Nature Physics 4, 839 - 842 (2008)
Published online: 26 October 2008 | doi:10.1038/nphys1107

Subject Categories: Atomic and molecular physics | Quantum physics | Information theory and computation

Deterministic entanglement swapping with an ion-trap quantum computer

M. Riebe1, T. Monz1, K. Kim1,3, A. S. Villar2,3, P. Schindler1, M. Chwalla1, M. Hennrich1 & R. Blatt1,2


Entanglement—once only a subject of disputes about the foundation of quantum mechanics—has today become an essential issue in the emerging field of quantum information processing, promising a number of applications, including secure communication, teleportation and powerful quantum computation. Therefore, a focus of current experimental work in the field of quantum information is the creation and manipulation of entangled quantum systems. Here, we present our results on entangling two qubits in an ion-trap quantum processor not through a direct interaction of the ion qubits but instead through the action of a protocol known as entanglement swapping1. Our ion-trap system enables us to implement all steps of the entanglement swapping protocol in a fully deterministic way. Thus, two ion qubits can be prepared on demand in a well-defined entangled state. This particular feature may facilitate the implementation of quantum repeaters2 or aid in distributing entangled states in ion-trap quantum computers3.

  1. Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
  2. Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstr. 21A, A-6020 Innsbruck, Austria
  3. Current addresses: Department of Physics and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA (K.K.); Institute of Optics, Information and Photonics, Max Planck Research Group, University of Erlangen-Nuernberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany (A.S.V.)

Correspondence to: M. Riebe1 e-mail: Mark.Riebe@uibk.ac.at


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