Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microwave Rabi resonances beyond the small-signal regime   The coupling between microwave fields and atoms (or atom-like systems) is
inherently weaker than for optical fields, making microwave signal manipulation
for applications like quantum information processing technically challenging.
In order to better understand this coupling and to develop tools for measuring
it, we explore the microwave coupling to atoms using the "atomic candle"
technique, and push it beyond the bounds of the small-signal regime in order to
deliver a larger signal. In familiar two-level systems, responses beyond the
usual Rabi oscillations can arise when a single-tone drive is phase-modulated,
causing the steady-state populations to oscillate at integer harmonics of the
modulation frequency. Resonant behavior of the first two harmonics for
frequencies near the Rabi frequency, known as $\alpha$ and $\beta$ Rabi
resonances, is widely used for microwave-field magnetometry and as a power
standard known as the atomic candle. Here, we explore Rabi resonances beyond
the small-signal approximation and report upon experimental observations of
higher-harmonic population response for microwave hyperfine transitions in cold
$^{87}\rm Rb$ atoms, which we compare to numerical simulations.

14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph