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Condensation and Coherence in Condensed Matter

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

Yasunobu Nakamura, Yu. A. Pashkin, Tsuyoshi Yamamoto, J. S. Tsai

Published Mar 1, 2003• 0 citations
Publisher
DOI
10.1142/9789812791269_0025

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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.

Physica Scripta•Jan 1, 2002•8 citations
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.