Decoherence in a Cooper pair shuttle
Alessandro Romito, Francesco Plastina, and Rosario Fazio
TL;DR
This paper investigates how decoherence, caused by gate voltage fluctuations, affects the Josephson current in a Cooper pair shuttle, revealing suppression, enhancement, and sign change of the critical current along with characteristic noise spectrum features.
Contribution
It provides a detailed analysis of decoherence effects on the Josephson current, highlighting how fluctuations can alter current magnitude, sign, and noise characteristics in a Cooper pair shuttle.
Findings
Decoherence can suppress or enhance the critical current.
Gate voltage fluctuations can change the sign of the Josephson current.
The noise spectrum shows a peak at the Josephson coupling energy with phase dependence.
Abstract
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.
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