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@ARTICLE{Riwar:850022,
author = {Riwar, Roman and Glazman, L. I. and Catelani, G.},
title = {{D}issipation by normal-metal traps in transmon qubits},
journal = {Physical review / B},
volume = {98},
number = {2},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2018-04108},
pages = {024502},
year = {2018},
abstract = {Quasiparticles are an intrinsic source of relaxation and
decoherence for superconducting qubits. Recent works have
shown that normal-metal traps may be used to evacuate
quasiparticles, and potentially improve the qubit lifetime.
Here, we investigate how far the normal metals themselves
may introduce qubit relaxation. We identify the Ohmic losses
inside the normal metal and the tunneling current through
the normal-metal–superconductor interface as the relevant
relaxation mechanisms. We show that the Ohmic loss
contribution depends strongly on the device and trap
geometry, as a result of the inhomogeneous electric fields
in the qubit. The correction of the quality factor due to
the tunneling current on the other hand is highly sensitive
to the nonequilibrium distribution function of the
quasiparticles. Overall, we show that even when choosing
less than optimal parameters, the presence of normal-metal
traps does not affect the quality factor of state-of-the-art
qubits.},
cin = {PGI-11 / PGI-2},
ddc = {530},
cid = {I:(DE-Juel1)PGI-11-20170113 / I:(DE-Juel1)PGI-2-20110106},
pnm = {144 - Controlling Collective States (POF3-144)},
pid = {G:(DE-HGF)POF3-144},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000437668600006},
doi = {10.1103/PhysRevB.98.024502},
url = {https://juser.fz-juelich.de/record/850022},
}