Abstract
We investigate the effects of waveguide loss and nonlinearities on the generation
of polarization entangled photon-pairs through spontaneous four-wave mixing (FWM) in
χ(3) materials. We quantify those effects through the analysis of the
coincidence-to-accidental ratio (CAR), and through the Clauser, Horne, Shimony, and Holt
(CHSH) inequality. Two distinct cases are analyzed. First, we consider a fixed fiber
length. Second, we admit that the fiber length decreases with the increase of the
waveguide loss coefficient. Results show that for the first case, for a fixed value of
waveguide loss the CHSH parameter tends to decrease with the increase of the nonlinear
parameter. This is due to the increase generation of multiphotons on the signal and
idler fields, which leads to an increase on the rate of accidental counts. This is also
verified by the analysis of the CAR. Results also show that for a fixed value of
nonlinear parameter, increasing the value of the loss coefficient leads to a strong
violation of the CHSH inequality. In the second scenario, results show that a strong
violation of the CHSH inequality is observed for short waveguide lengths. Our findings
also show that a high value of coincidence counting rate does not necessarily leads to a
strong violation of the CHSH inequality.
© 2013 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription