Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum non-demolition dispersive readout of a superconducting
  artificial atom using large photon numbers   Reading out the state of superconducting artificial atoms typically relies on
dispersive coupling to a readout resonator. For a given system noise
temperature, increasing the circulating photon number $\bar{n}$ in the
resonator enables a shorter measurement time and is therefore expected to
reduce readout errors caused by spontaneous atom transitions. However,
increasing $\bar{n}$ is generally observed to also increase these transition
rates. Here we present a fluxonium artificial atom in which we measure an
overall flat dependence of the transition rates between its first two states as
a function of $\bar{n}$, up to $\bar{n}\approx200$. Despite the fact that we
observe the expected decrease of the dispersive shift with increasing readout
power, the signal-to-noise ratio continuously improves with increasing
$\bar{n}$. Even without the use of a parametric amplifier, at $\bar{n}=74$, we
measure fidelities of 99% and 93% for feedback-assisted ground and excited
state preparation, respectively.

7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int