TY  - JOUR
AU  - Wang, C.
AU  - Gao, Y. Y.
AU  - Pop, I. M.
AU  - Vool, U.
AU  - Axline, C.
AU  - Brecht, T.
AU  - Heeres, R. W.
AU  - Frunzio, L.
AU  - Devoret, M. H.
AU  - Catelani, G.
AU  - Glazman, L. I.
AU  - Schoelkopf, R. J.
TI  - Measurement and control of quasiparticle dynamics in a superconducting qubit
JO  - Nature Communications
VL  - 5
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2014-07047
SP  - 5836
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000347682100002
C6  - pmid:25518969
DO  - DOI:10.1038/ncomms6836
UR  - https://juser.fz-juelich.de/record/185621
ER  -