Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bunching of Photons When Two Beams Pass Through a a Beam Splitter   Dirac has written "Each photon then interferes only with itself. Interference
between two different photons never occurs." Indeed, a practical definition is
that "classical" optics consists of phenomena due to the interference of
photons only with themselves. However, photons obey Bose statistics which
implies a ``nonclassical'' tendency for them to ``bunch''. For a simple example
of nonclassical optical behavior, we consider two pulses of photons of a single
frequency that are simultaneously incident on two sides of a lossless, 50:50
beam splitter.

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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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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: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: supr-con