Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mesoscopic entanglement of noninteracting qubits using collective
  spontaneous emission   We describe an experimentally straightforward method for preparing an
entangled W state of up to 100 qubits. Our repeat-until-success protocol relies
on detection of single photons from collective spontaneous emission in free
space. Our method allows entanglement preparation in a wide range of qubit
implementations that lack entangling qubit-qubit interactions. We give detailed
numerical examples for entanglement of neutral atoms in optical lattices and of
nitrogen-vacancy centres in diamond. The simplicity of our method should enable
preparation of mesoscopic entangled states in a number of physical systems in
the near future.

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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
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The categories of this paper are: adap-org
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
2
The categories of this paper are: math
1
The categories of this paper are: cs