Vanishing quasiparticle density in a hybrid Al/Cu/Al single-electron transistor

被引：78

作者：

Saira, O-P ^{[1
]}

Kemppinen, A. ^{[2
]}

Maisi, V. F. ^{[2
]}

Pekola, J. P. ^{[1
]}

机构：

[1] Aalto Univ, Low Temp Lab, FI-00076 Aalto, Finland

[2] Ctr Metrol & Accreditat MIKES, FI-02151 Espoo, Finland

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 01期

基金：

芬兰科学院;

关键词：

DEVICES;

D O I：

10.1103/PhysRevB.85.012504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

收藏

页数：4

相关论文

共 25 条

[1] Nonadiabatic charge pumping in a hybrid single-electron transistor [J].

Averin, Dmitri V. ;

Pekola, Jukka P. .

PHYSICAL REVIEW LETTERS, 2008, 101 (06)

[2] Minimizing quasiparticle generation from stray infrared light in superconducting quantum circuits [J].

Barends, R. ;

Wenner, J. ;

Lenander, M. ;

Chen, Y. ;

Bialczak, R. C. ;

Kelly, J. ;

Lucero, E. ;

O'Malley, P. ;

Mariantoni, M. ;

Sank, D. ;

Wang, H. ;

White, T. C. ;

Yin, Y. ;

Zhao, J. ;

Cleland, A. N. ;

Martinis, John M. ;

Baselmans, J. J. A. .

APPLIED PHYSICS LETTERS, 2011, 99 (11)

[3] Enhancement of quasiparticle recombination in Ta and Al superconductors by implantation of magnetic and nonmagnetic atoms [J].

Barends, R. ;

van Vliet, S. ;

Baselmans, J. J. A. ;

Yates, S. J. C. ;

Gao, J. R. ;

Klapwijk, T. M. .

PHYSICAL REVIEW B, 2009, 79 (02)

[4] Quasiparticle relaxation in optically excited high-Q superconducting resonators [J].

Barends, R. ;

Baselmans, J. J. A. ;

Yates, S. J. C. ;

Gao, J. R. ;

Hovenier, J. N. ;

Klapwijk, T. M. .

PHYSICAL REVIEW LETTERS, 2008, 100 (25)

[5] Quasiparticle Relaxation of Superconducting Qubits in the Presence of Flux [J].

Catelani, G. ;

Koch, J. ;

Frunzio, L. ;

Schoelkopf, R. J. ;

Devoret, M. H. ;

Glazman, L. I. .

PHYSICAL REVIEW LETTERS, 2011, 106 (07)

[6] Quantitative study of quasiparticle traps using the single-Cooper-pair transistor [J].

Court, N. A. ;

Ferguson, A. J. ;

Lutchyn, Roman ;

Clark, R. G. .

PHYSICAL REVIEW B, 2008, 77 (10)

[7] Number Fluctuations of Sparse Quasiparticles in a Superconductor [J].

de Visser, P. J. ;

Baselmans, J. J. A. ;

Diener, P. ;

Yates, S. J. C. ;

Endo, A. ;

Klapwijk, T. M. .

PHYSICAL REVIEW LETTERS, 2011, 106 (16)

[8] TUNNELING STUDY OF SUPERCONDUCTIVITY NEAR THE METAL-INSULATOR-TRANSITION [J].

DYNES, RC ;

GARNO, JP ;

HERTEL, GB ;

ORLANDO, TP .

PHYSICAL REVIEW LETTERS, 1984, 53 (25) :2437-2440

[9] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[10] Opportunities for mesoscopics in thermometry and refrigeration:: Physics and applications [J].

Giazotto, F ;

Heikkilä, TT ;

Luukanen, A ;

Savin, AM ;

Pekola, JP .

REVIEWS OF MODERN PHYSICS, 2006, 78 (01) :217-274