Long-lived qubit memory using atomic ions

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, D. J. Wineland

Research output: Contribution to journalArticlepeer-review


We demonstrate experimentally a robust quantum memory using a magnetic-field-independent hyperfine transition in Be+9 atomic ion qubits at a magnetic field B 0.01194T. 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 Be+9. 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.

Original languageEnglish (US)
Article number060502
JournalPhysical review letters
Issue number6
StatePublished - Aug 5 2005
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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