Experimental demonstration of a robust, high-fidelity geometric two ion-qubit phase gate

D. Leibfried, B. DeMarco, V. Meyer, D. Lucas, M. Barrett, J. Britton, W. M. Itano, B. Jelenković, C. Langer, T. Rosenband and D. J. Wineland ()
Additional contact information
D. Leibfried: National Institute of Standards and Technology
B. DeMarco: National Institute of Standards and Technology
V. Meyer: National Institute of Standards and Technology
D. Lucas: National Institute of Standards and Technology
M. Barrett: National Institute of Standards and Technology
J. Britton: National Institute of Standards and Technology
W. M. Itano: National Institute of Standards and Technology
B. Jelenković: National Institute of Standards and Technology
C. Langer: National Institute of Standards and Technology
T. Rosenband: National Institute of Standards and Technology
D. J. Wineland: National Institute of Standards and Technology

Nature, 2003, vol. 422, issue 6930, 412-415

Abstract: Abstract Universal logic gates for two quantum bits (qubits) form an essential ingredient of quantum computation. Dynamical gates have been proposed1,2 in the context of trapped ions; however, geometric phase gates (which change only the phase of the physical qubits) offer potential practical advantages because they have higher intrinsic resistance to certain small errors and might enable faster gate implementation. Here we demonstrate a universal geometric π-phase gate between two beryllium ion-qubits, based on coherent displacements induced by an optical dipole force. The displacements depend on the internal atomic states; the motional state of the ions is unimportant provided that they remain in the regime in which the force can be considered constant over the extent of each ion's wave packet. By combining the gate with single-qubit rotations, we have prepared ions in an entangled Bell state with 97% fidelity—about six times better than in a previous experiment3 demonstrating a universal gate between two ion-qubits. The particular properties of the gate make it attractive for a multiplexed trap architecture4,5 that would enable scaling to large numbers of ion-qubits.

Date: 2003
References: Add references at CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.nature.com/articles/nature01492 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:422:y:2003:i:6930:d:10.1038_nature01492

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/nature01492

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().