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Long-Lived Qubit Memory Using Atomic Ions



C. Langer, R Ozeri, John D. Jost, J Chiaverini, B. L. DeMarco, A. Ben-Kish, Brad R. Blakestad, Joseph W. Britton, David Hume, Wayne M. Itano, Dietrich G. Leibfried, Rainer Reichle, Till P. Rosenband, Tobias Schaetz, Piet Schmidt, David J. Wineland


We demonstrate experimentally a robust quantum memory using a magnetic-field-independent hyperfine transition in 9Be+ atomic ioin qubits at a magnetic field B=0.01194 T. We observe the single physical qubit memory coherence time to be greater than 10 seconds, an improvement of approximately five orders of magnitude from previous experiments in 9Be+, nearly eliminating memory errors in this system. 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.
Physical Review Letters


atom trapping and cooling, decoherence-fre subspace, long coherence time, quantum computation, quantum information processing, quantum memory, quantum superpositions, quantum-state engineering, trapped ions


Langer, C. , Ozeri, R. , Jost, J. , Chiaverini, J. , DeMarco, B. , Ben-Kish, A. , Blakestad, B. , Britton, J. , Hume, D. , Itano, W. , Leibfried, D. , Reichle, R. , Rosenband, T. , Schaetz, T. , Schmidt, P. and Wineland, D. (2005), Long-Lived Qubit Memory Using Atomic Ions, Physical Review Letters, [online], (Accessed April 25, 2024)
Created August 5, 2005, Updated January 27, 2020