TY  - JOUR
AU  - Hosseinkhani, A.
AU  - Riwar, Roman
AU  - Schoelkopf, R. J.
AU  - Glazman, L. I.
AU  - Catelani, Gianluigi
TI  - Optimal Configurations for Normal-Metal Traps in Transmon Qubits
JO  - Physical review applied
VL  - 8
IS  - 6
SN  - 2331-7019
CY  - College Park, Md. [u.a.]
PB  - American Physical Society
M1  - FZJ-2018-00706
SP  - 064028
PY  - 2017
AB  - Controlling quasiparticle dynamics can improve the performance of superconducting devices. For example, it has been demonstrated effective in increasing the lifetime and stability of superconducting qubits. Here we study how to optimize the placement of normal-metal traps in transmon-type qubits. When the trap size increases beyond a certain characteristic length, the details of the geometry and trap position, and even the number of traps, become important. We discuss for some experimentally relevant examples how to shorten the decay time of the excess quasiparticle density. Moreover, we show that a trap in the vicinity of a Josephson junction can significantly reduce the steady-state quasiparticle density near that junction, thus, suppressing the quasiparticle-induced relaxation rate of the qubit. Such a trap also reduces the impact of fluctuations in the generation rate of quasiparticles, rendering the qubit more stable.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000418665700004
DO  - DOI:10.1103/PhysRevApplied.8.064028
UR  - https://juser.fz-juelich.de/record/842481
ER  -