Fluxonium: single Cooper pair circuit free of charge offsets

Applied Physics departments; CT; Jens Koch; Leonid Glazman; Michel Devoret (Yale University; New Haven; Physics; USA); Vladimir E. Manucharyan

Fluxonium: single Cooper pair circuit free of charge offsets

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arxiv 0906.0831 v2 pith:7GMCFFYH submitted 2009-06-04 cond-mat.mes-hall cond-mat.supr-con

Vladimir E. Manucharyan , Jens Koch , Leonid Glazman , Michel Devoret (Yale University , Physics , Applied Physics departments , New Haven , CT

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keywords chargescooperpairquantumsinglecircuitjunctionjunctions

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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 to 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 which 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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