Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trapped-Ion State Detection through Coherent Motion   We demonstrate a general method for state detection of trapped ions that can
be applied to a large class of atomic and molecular species. We couple a
"spectroscopy" ion (Al+) to a "control" ion (Mg+) in the same trap and perform
state detection through off-resonant laser excitation of the spectroscopy ion
that induces coherent motion. The motional amplitude, dependent on the
spectroscopy ion state, is measured either by time-resolved photon counting, or
by resolved sideband excitations on the control ion. The first method provides
a simplified way to distinguish "clock" states in Al+, which avoids ground
state cooling and sideband transitions. The second method reduces spontaneous
emission and optical pumping on the spectroscopy ion, which we demonstrate by
nondestructively distinguishing Zeeman sublevels in the 1S0 ground state of
Al+.

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The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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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
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys