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Long-lived qubit memory using atomic ions

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arxiv quant-ph/0504076 v1 pith:QAPHW77C submitted 2005-04-11 quant-ph

Long-lived qubit memory using atomic ions

classification quant-ph
keywords memoryqubitqubitsatomiccoherenceobservephysicalapproximately
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 seconds, an improvement of approximately five 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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