Fluxonium:single Cooper-pair circuit free of charge offsets

Manucharyan, Vladimir E. and Koch, Jens and Glazman, Leonid and Devoret, Michel H. (2009) Fluxonium:single Cooper-pair circuit free of charge offsets. Science, 326 (5949). pp. 113-116. ISSN 0036-8075

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The promise of single Cooper-pair quantum circuits based on tunnel junctions for metrology and quantum information applications is severely limited by the influence of offset charges: random, slowly drifting microscopic charges inherent in many solid-state systems. By shunting a small junction with the Josephson kinetic inductance of a series array of large-capacitance tunnel junctions, thereby ensuring that all superconducting islands are connected to the circuit by at least one large junction, we have realized a new superconducting artificial atom that is totally insensitive to offset charges. Yet its energy levels manifest the anharmonic structure associated with single Cooper-pair effects, a useful component for solid-state quantum computation.

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19 Sep 2012 09:24
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19 Apr 2022 03:46