Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Originally published in Science Express on 4 January 2001
Science 9 February 2001:
Vol. 291. no. 5506, pp. 1013 - 1015
DOI: 10.1126/science.1057357
Prev | Table of Contents | Next

Reports

A Decoherence-Free Quantum Memory Using Trapped Ions

D. Kielpinski,1* V. Meyer,1 M. A. Rowe,1 C. A. Sackett,1 W. M. Itano,1 C. Monroe,2 D. J. Wineland1

We demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit into the decoherence-free subspace (DFS) of a pair of trapped 9Be+ ions, we protect the qubit from environment-induced dephasing that limits the storage time of a qubit composed of a single ion. We measured the storage time under ambient conditions and under interaction with an engineered noisy environment and observed that encoding into the DFS increases the storage time by up to an order of magnitude. The encoding reversibly transfers an arbitrary qubit stored in a single ion to the DFS of two ions.

1 Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
2 Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA.
*   To whom correspondence should be addressed. E-mail: davidk{at}boulder.nist.gov

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Control and Measurement of Three-Qubit Entangled States.
C. F. Roos, M. Riebe, H. Haffner, W. Hansel, J. Benhelm, G. P. T. Lancaster, C. Becher, F. Schmidt-Kaler, and R. Blatt (2004)
Science 304, 1478-1480
   Abstract »    Full Text »    PDF »
Experimental Realization of Noiseless Subsystems for Quantum Information Processing.
L. Viola, E. M. Fortunato, M. A. Pravia, E. Knill, R. Laflamme, and D. G. Cory (2001)
Science 293, 2059-2063
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)