Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-04
Science 326, 113-116 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Introduction and title updated
Scientific paper
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.
Devoret Michel
Glazman Leonid
Koch Jens
Manucharyan Vladimir E.
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