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Phys. Rev. Lett. 95, 060502 (2005) [4 pages]

Long-Lived Qubit Memory Using Atomic Ions

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C. Langer *, R. Ozeri, J. D. Jost, J. Chiaverini, B. DeMarco †, A. Ben-Kish ‡, R. B. Blakestad, J. Britton, D. B. Hume, W. M. Itano, D. Leibfried, R. Reichle, T. Rosenband, T. Schaetz §, P. O. Schmidt **, and D. J. Wineland
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA

Received 9 April 2005; published 2 August 2005

We demonstrate experimentally a robust quantum memory using a magnetic-field-independent hyperfine transition in 9Be+ atomic ion qubits at a magnetic field B≃0.01194  T. We observe that the single physical qubit memory coherence time is greater than 10 s, an improvement of approximately 5 orders of magnitude from previous experiments with 9Be+. We also observe long coherence times of decoherence-free subspace logical qubits comprising two entangled physical qubits and discuss the merits of each type of qubit.


URL: http://link.aps.org/doi/10.1103/PhysRevLett.95.060502
DOI: 10.1103/PhysRevLett.95.060502
PACS: 03.67.Pp, 03.65.Yz, 03.67.Mn, 32.60.+i

* Electronic address: clanger@boulder.nist.gov
† Present address: Univeristy of Illinois at Urbana-Champaign
‡ Present address: Technion, Israel
§ Present address: Max Planck Institute of Quantum Optics
** Present address: University of Innsbruck, Austria

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