Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heralded entanglement of two ions in an optical cavity   We demonstrate precise control of the coupling of each of two trapped ions to
the mode of an optical resonator. When both ions are coupled with near-maximum
strength, we generate ion--ion entanglement heralded by the detection of two
orthogonally polarized cavity photons. The entanglement fidelity with respect
to the Bell state $\Psi^+$ reaches $F \geq (91.9\pm2.5)%$. This result
represents an important step toward distributed quantum computing with cavities
linking remote atom-based registers.

1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc