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Coherent Manipulations of Charge-Number States in a Cooper-Pair Box

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<mark>Journal publication date</mark>2002
<mark>Journal</mark>Physica Scripta
Issue number1
Number of pages7
Pages (from-to)155-161
Publication StatusPublished
<mark>Original language</mark>English


We have investigated coherent properties of an artificial two-level system realized in a small-Josephson-junction circuit. Two charge-number states of a small superconducting electrode connected to a reservoir via a Josephson junction were used as the two relevant states. Coherent manipulations of the charge-number states by applying a gate-voltage pulse were demonstrated, and decoherence of the system was studied through a spin-echo-type experiment. The result suggested that low-frequency energy-level fluctuations due to 1/f background charge noise is a dominant source of the dephasing.