Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Controlling the spontaneous emission of a superconducting transmon qubit   We present a detailed characterization of coherence in seven transmon qubits
in a circuit QED architecture. We find that spontaneous emission rates are
strongly influenced by far off-resonant modes of the cavity and can be
understood within a semiclassical circuit model. A careful analysis of the
spontaneous qubit decay into a microwave transmission-line cavity can
accurately predict the qubit lifetimes over two orders of magnitude in time and
more than an octave in frequency. Coherence times $T_1$ and $T_2^*$ of more
than a microsecond are reproducibly demonstrated.

26
The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
18
The categories of this paper are: econ
9
The categories of this paper are: nlin