Journal Article

FZJ-2014-07047

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurement and control of quasiparticle dynamics in a superconducting qubit

Wang, C. (Corresponding Author) ; Gao, Y. Y. ; Pop, I. M. ; Vool, U. ; Axline, C. ; Brecht, T. ; Heeres, R. W. ; Frunzio, L. ; Devoret, M. H. ; Catelani, G.FZJ* ; Glazman, L. I. ; Schoelkopf, R. J.

2014
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/23091  doi:10.1038/ncomms6836

Abstract: Superconducting circuits have attracted growing interest in recent years as a promising candidate for fault-tolerant quantum information processing. Extensive efforts have always been taken to completely shield these circuits from external magnetic fields to protect the integrity of the superconductivity. Here we show vortices can improve the performance of superconducting qubits by reducing the lifetimes of detrimental single-electron-like excitations known as quasiparticles. Using a contactless injection technique with unprecedented dynamic range, we quantitatively distinguish between recombination and trapping mechanisms in controlling the dynamics of residual quasiparticle, and show quantized changes in quasiparticle trapping rate because of individual vortices. These results highlight the prominent role of quasiparticle trapping in future development of superconducting qubits, and provide a powerful characterization tool along the way.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 424 - Exploratory materials and phenomena (POF2-424) (POF2-424)

Appears in the scientific report 2014

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