Journal
SCIENCE
Volume 326, Issue 5949, Pages 113-116Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1175552
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Funding
- NSF [DMR-0754613, DMR-032-5580]
- National Security Agency through ARO [W911NF-05-01-0365]
- Keck Foundation
- Agence Nationale pour la Recherche [ANR07-CEXC-003]
- College de France
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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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