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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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1432-0649

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Measurement of the coherence time of the groundst

Authors: S Haze T Ohno K Toyoda S Urabe
Publish Date: 2011/06/11
Volume: 105, Issue: 4, Pages: 761-765
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Abstract

The transition between the two Zeeman sublevels of 2S1/2 in a single trapped 40Ca+ ion is directly excited by a radiofrequency magnetic field A coherence time of 294±25 ms is measured by Ramsey interferometry The ratio of the maximum Rabi frequency of the Zeeman transition ∼250 kHz to the inverse of the coherence time is 73×103 which is considered to be a figure of merit for Zeeman states when they are used as a quantum bit Several applications of the Zeeman qubit to quantum information processing are also discussed

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