Journal
PHYSICAL REVIEW B
Volume 85, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.012504
Keywords
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Funding
- Academy of Finland
- Vaisala Foundation
- Finnish National GraCentennial Foundationduate School in Nanoscience, Technology Industries of Finland Centennial Foundation
- European Community [217257, 218783, 238345]
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The achievable fidelity of many nanoelectronic devices based on superconducting aluminum is limited by either the density of residual nonequilibrium quasiparticles n(qp) or the density of quasiparticle states in the gap, characterized by Dynes parameter gamma. We infer upper bounds n(qp) < 0.033 mu m(-3) and gamma < 1.6 x 10(-7) from transport measurements performed on Al/Cu/Al single-electron transistors, improving previous results by an order of magnitude. Owing to efficient microwave shielding and quasiparticle relaxation, a typical number of quasiparticles in the superconducting leads is zero.
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