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Charge Echo in a Cooper-Pair Box

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Article number047901
<mark>Journal publication date</mark>28/01/2002
<mark>Journal</mark>Physical review letters
Issue number4
Volume88
Number of pages4
Publication StatusPublished
Early online date8/01/02
<mark>Original language</mark>English

Abstract

A spin-echo-type technique is applied to an artificial two-level system that utilizes a charge degree of freedom in a small superconducting electrode. Gate-voltage pulses are used to produce the necessary pulse sequence in order to eliminate the inhomogeneity effect in the time-ensemble measurement and to obtain refocused echo signals. Comparison of the decay time of the observed echo signal with an estimated decoherence time suggests that low-frequency energy-level fluctuations due to the
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charge noise dominate the dephasing in the system.