Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent population oscillations and an effective spin-exchange
  interaction in a $\mathcal{PT}$ symmetric polariton mixture   We study a two-species mixture of exciton-polaritons with self- and
cross-interaction nonlinearities in a double well structure, in the presence of
relaxation and continuous pumping. We identify the conditions that render the
system parity-time ($\mathcal{PT}$) symmetric, and investigate its dynamic and
static properties. We show that the system can exhibit long-term coherent
oscillations of populations of the two polaritonic components between the two
potential wells, and can simulate the dynamics of a pair of spin-1/2 particles
(qubits) in the presence of exchange interaction.

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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol