Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generating single longitudinal mode entangled photons in telecom band
  via a submillimeter monolithic cavity   A high-quality, compact, and narrow-bandwidth entangled photon source (EPS)
is indispensable for realization of many quantum communication protocols.
Usually, a free space cavity containing a nonlinear crystal is used to generate
a narrow bandwidth EPS through spontaneous parametric down-conversion (SPDC).
One major drawback is that this occupies a large space and requires complex
optical and electrical control systems. Here we present a simple and compact
method to generate a single-longitudinal-mode time-energy EPS via type II SPDC
in a submillimeter Fabry-Perot cavity. We characterize the quality of the EPS
by measuring the coincidence to accidental coincidence ratio, the two-photon
time cross-correlation function and the two-photon interference fringes. All
measured results clearly demonstrate that the developed source is of high
quality when compared with EPSs generated using other configurations. We
believe this source is very promising for applications in the quantum
communication field.

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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
9
The categories of this paper are: nlin
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The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
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The categories of this paper are: eess
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph