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(color online) The LN photonic chip with dimensions of
. The widths of the single mode waveguides are
for the pump (section I) and
for the entangled photons (sections II and III). The PPLN section is 10 mm long with a poled period of
. The interaction length of C1 (C2) is
(
) at a gap of
between the coupled waveguides. The electrodes are 8.35 mm long with a separation of
. Reproduced from Ref. [123].
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