Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiphoton transitions between energy levels in a phase-biased
  Cooper-pair box   We investigated both theoretically and experimentally dynamic features of a
phase-biased charge qubit consisting of a single-Cooper-pair transistor closed
by a superconducting loop. The effective inductance of the qubit was probed by
a high-quality tank circuit. In the presence of a microwave power, with a
frequency of the order of the qubit energy level separation, an alteration of
the qubit inductance was observed. We demonstrate that this effect is caused by
the redistribution of the qubit level population. The excitation of the qubit
by one-, two-, and three-photon processes was detected. Quantitative agreement
between theory and experimental data was found.

8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg