  The interplay between the nonclassical features and the parity-time (PT)
symmetry (or its breaking) is studied here by considering a PT symmetric system
consisting of two cavities with gain and loss. The conditions for PT invariance
is obtained for this system. The behavior of the average photon number
corresponding to the gain and loss modes for different initial states (e.g.,
vacuum, NOON, coherent, and thermal states) has also been obtained. With the
help of the number operators, quantum Zeno and anti-Zeno effects are studied,
and the observed behavior is compared in PT symmetric (PTS) and PT symmetry
broken (PTSB) regimes. It has been observed that the relative phase of the
input coherent fields plays a key role in the occurrence of these effects.
Further, some nonclassicality features are witnessed using criteria based on
the number operator(s). Specifically, intermodal antibunching, sum and
difference squeezing, are investigated for specific input states. It is found
that the various nonclassical features, including the observed quantum Zeno and
anti-Zeno effects, are suppressed when one goes from PTS to PTSB regime. In
other words, the dominance of the loss/gain rate in the field modes over the
coupling strength between them diminishes the nonclassical features of the
system.
