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Decoherence in a Cooper pair shuttle

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Article number140502
<mark>Journal publication date</mark>3/10/2003
<mark>Journal</mark>Physical Review B - Condensed Matter and Materials Physics
Issue number14
Publication StatusPublished
<mark>Original language</mark>English


We examine decoherence effects in the Josephson current of a Cooper pair shuttle. Dephasing due to gate voltage fluctuations can either suppress or enhance the critical current and also change its sign. The current noise spectrum displays a peak at the Josephson coupling energy and shows a phase dependence.