Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Combating fluctuations in relaxation times of fixed-frequency transmon
  qubits with microwave-dressed states   With the long coherence time, fixed-frequency transmon qubit is a promising
qubit modality for quantum computing. Currently, diverse qubit architectures
that utilize fixed-frequency transmon qubits have been demonstrated with
high-fidelity gate performance. Nevertheless, the relaxation times of transmon
qubits can have large temporal fluctuations, causing instabilities in gate
performance. The fluctuations are often believed to be caused by nearly
on-resonance couplings with sparse two-level-system (TLS) defects. To mitigate
their impact on qubit coherence and gate performance, one direct approach is to
tune the qubits away from these TLSs. In this work, to combat the potential
TLS-induced performance fluctuations in a tunable-bus architecture unitizing
fixed-frequency transmon qubits, we explore the possibility of using an
off-resonance microwave drive to effectively tuning the qubit frequency through
the ac-Stark shift while implementing universal gate operations on the
microwave-dressed qubit. We show that the qubit frequency can be tuned up to 20
MHz through the ac-stark shift while keeping minimal impacts on the qubit
control. Besides passive approaches that aim to remove these TLSs through more
careful treatments of device fabrications, this work may offer an active
approach towards mitigating the TLS-induced performance fluctuations in
fixed-frequency transmon qubit devices.

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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex