Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-correlated Photons from a In$_{0.5}$Ga$_{0.5}$P Photonic Crystal
  Cavity on a Silicon Chip   Time-correlated photon pairs are generated by triply-resonant
Four-Wave-Mixing in a In$_{0.5}$Ga$_{0.5}$P Photonic Crystal cavitiy. Maximal
efficiency is reached by actively compensating the residual spectral
misalignment of the cavity modes. The generation rate reaches 5 MHz in cavities
with Q-factor $\approx 4\times 10^4$, more than one order of magnitude larger
than what is measured using ring resonators with similar Q factors fabricated
on the same chip. The Photonic Crystal source is integrated on a Si photonic
circuit, an important asset for applications in quantum technologies.

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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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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: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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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: mtrl-th