Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient quasiparticle traps with low dissipation through gap
  engineering   Quasiparticles represent an intrinsic source of perturbation for
superconducting qubits, leading to both dissipation of the qubit energy and
dephasing. Recently, it has been shown that normal-metal traps may efficiently
reduce the quasiparticle population and improve the qubit lifetime, provided
the trap surpasses a certain characteristic size. Moreover, while the trap
itself introduces new relaxation mechanisms, they are not expected to harm
state-of-the-art transmon qubits under the condition that the traps are not
placed too close to extremal positions where electric fields are high. Here, we
study a different type of trap, realized through gap engineering. We find that
gap-engineered traps relax the remaining constraints imposed on normal metal
traps. Firstly, the characteristic trap size, above which the trap is
efficient, is reduced with respect to normal metal traps, such that here,
strong traps are possible in smaller devices. Secondly, the losses caused by
the trap are now greatly reduced, providing more flexibility in trap placement.
The latter point is of particular importance, since for efficient protection
from quasiparticles, the traps ideally should be placed close to the active
parts of the qubit device, where electric fields are typically high.

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The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci