Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal effects of the quantum states generated from the isomorphs of
  PPKTP crystal   We theoretically and numerically investigate the temperature-dependent
properties of the biphotons generated from four isomorphs of periodically poled
$\mathrm{KTiOPO_4}$ (PPKTP): i.e., PPRTP, PPKTA, PPRTA and PPCTA. It is
discovered that the first type of group-velocity-matched (GVM) wavelength is
decreased by 6.4, 1.2, 8.9, 25.6 and 6.3 nm, while the phase-matched wavelength
is decreased by 4.4, -0.4, -1.2, 29.1 and 59.5 nm for PPKTP, PPRTP, PPKTA,
PPRTA and PPCTA, respectively, when the temperature is increased from
20$\,^{\circ}\mathrm{C}$ to 120$\,^{\circ}\mathrm{C}$. Although the maximal
spectral purity of the heralded single photons is not changed at different
temperature, the Hong-Ou-Mandel (HOM) interference shows different patterns due
to a shift of the joint spectral amplitude. These thermal effects are very
important for precise control of the quantum state for the future applications
in quantum information processing, for example, in quantum interference or
spectroscopy.

35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg