Phys. Rev. B 77, 100501(R) (2008) [4 pages]

Quantitative study of quasiparticle traps using the single-Cooper-pair transistor

Abstract

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N. A. Court^1,*, A. J. Ferguson^1,†, Roman Lutchyn², and R. G. Clark¹
¹Australian Research Council Centre of Excellence for Quantum Computer Technology, University of New South Wales, Sydney NSW 2052, Australia
²Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA

Received 24 January 2008; published 6 March 2008

We use radio-frequency reflectometry to measure quasiparticle tunneling rates in the single-Cooper-pair transistor. Devices with and without quasiparticle traps in proximity to the island are studied. A 10²- to 10³-fold reduction in the quasiparticle tunneling rate onto the island is observed in the case of quasiparticle traps. In the quasiparticle trap samples we also measure a commensurate decrease in quasiparticle tunneling rate off the island.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.77.100501

DOI:

10.1103/PhysRevB.77.100501

PACS:

85.25.Cp, 73.23.Hk, 74.25.Fy

^*ncourt@phys.unsw.edu.au

^†Present address: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, United Kingdom.

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Phys. Rev. B 77, 100501(R) (2008) [4 pages]

Quantitative study of quasiparticle traps using the single-Cooper-pair transistor