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Published Online January 4, 2001
Science DOI: 10.1126/science.1057357

Reports

Submitted on November 10, 2000
Accepted on December 22, 2000

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 , and D. J. Wineland 1

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.

We have demonstrated 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 measure the storage time both under ambient conditions and under interaction with an engineered noisy environment, and observe 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.


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