Long-lived qubit memory using atomic ions.
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.
Langer
C
C
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. clanger@boulder.nist.gov
Ozeri
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Jost
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Chiaverini
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Demarco
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Ben-Kish
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Blakestad
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Britton
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Hume
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Itano
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Leibfried
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Reichle
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Rosenband
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Schaetz
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Schmidt
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Wineland
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