Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-Dependent Josephson Current through Double Quantum Dots and
  Measurement of Entangled Electron States   We study a double quantum dot each dot of which is tunnel-coupled to
superconducting leads. In the Coulomb blockade regime, a spin-dependent
Josephson coupling between two superconductors is induced, as well as an
antiferromagnetic Heisenberg exchange coupling between the spins on the double
dot which can be tuned by the superconducting phase difference. We show that
the correlated spin states-singlet or triplets-on the double dot can be probed
via the Josephson current in a dc-SQUID setup.

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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an