Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermitian Optics   Non-Hermitian optics, mostly known as 'Parity-time symmetric optics', is
considered as one of the frontiers areas of research in optical sciences at
present. This area is largely inspired by the so-called non-Hermitian quantum
physics. While the non-Hermitian quantum mechanics is yet to be accepted
widely, parity-time symmetric optics is already a craze among physicists with
many experimental results and demonstrations to its support. In this article,
keeping under graduate students in mind, in particular, we are giving a brief
introduction to this promising area of research in physics.

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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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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: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg