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Phys Rev Lett. 2005 Aug 5;95(6):060502. Epub 2005 Aug 2.

Long-lived qubit memory using atomic ions.

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National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.


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

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