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ABSTRACT 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. Access through your institution Buy or subscribe This is a preview of subscription content, access via

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* Learn about institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS EFFICIENT ARBITRARY SIMULTANEOUSLY ENTANGLING GATES ON A

TRAPPED-ION QUANTUM COMPUTER Article Open access 11 June 2020 NATIVE QUDIT ENTANGLEMENT IN A TRAPPED ION QUANTUM PROCESSOR Article Open access 19 April 2023 POWER-OPTIMAL, STABILIZED

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_Phys. Rev._ 80, 580–594 (1950). Article  ADS  Google Scholar  Download references ACKNOWLEDGEMENTS We gratefully acknowledge support by the Austrian Science Fund (FWF), the European

Commission (SCALA, CONQUEST networks) and the Institut für Quanteninformation GmbH. This material is based on work supported in part by the U.S. Army Research Office. AUTHOR INFORMATION

Author notes * K. Kim & A. S. Villar Present address: 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.), AUTHORS AND

AFFILIATIONS * Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria M. Riebe, T. Monz, K. Kim, P. Schindler, M. Chwalla, M. Hennrich & R.

Blatt * Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstr. 21A, A-6020 Innsbruck, Austria A. S. Villar & R. Blatt Authors * M.

Riebe View author publications You can also search for this author inPubMed Google Scholar * T. Monz View author publications You can also search for this author inPubMed Google Scholar * K.

Kim View author publications You can also search for this author inPubMed Google Scholar * A. S. Villar View author publications You can also search for this author inPubMed Google Scholar

* P. Schindler View author publications You can also search for this author inPubMed Google Scholar * M. Chwalla View author publications You can also search for this author inPubMed Google

Scholar * M. Hennrich View author publications You can also search for this author inPubMed Google Scholar * R. Blatt View author publications You can also search for this author inPubMed 

Google Scholar CORRESPONDING AUTHOR Correspondence to M. Riebe. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Riebe, M., Monz, T., Kim, K. _et al._

Deterministic entanglement swapping with an ion-trap quantum computer. _Nature Phys_ 4, 839–842 (2008). https://doi.org/10.1038/nphys1107 Download citation * Received: 27 March 2008 *

Accepted: 24 September 2008 * Published: 26 October 2008 * Issue Date: November 2008 * DOI: https://doi.org/10.1038/nphys1107 SHARE THIS ARTICLE Anyone you share the following link with will

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