Long-lived qubit memory using atomic ions

Details Long-lived qubit memory using atomic ions Long-lived qubit memory using atomic ions

2005-04-11

arxiv.org/abs/quant-ph/0504076v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.060502

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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