  In the presence of quantum gravity fluctuations (space-time foam), the CPT
operator may be ill-defined. Its perturbative treatment leads to a modification
of the Einstein-Podolsky-Rosen correlation of the neutral meson system by
adding an Entanglement-weakening term of the wrong exchange symmetry, the
$\omega$-effect. In the current paper we identify how to probe the complex
$\omega$ in the entangled $B_d$-system using Flavour(f)-CP(g) eigenstate decay
channels: the connection between the Intensities for the two time-ordered
decays (f, g) and (g, f) is lost. Appropriate observables are constructed
allowing independent experimental determinations of Re($\omega$) and
Im($\omega$), disentangled from CPT violation in the evolution Hamiltonian
Re($\theta$) and Im($\theta$). 2-$\sigma$ tensions for both Re($\theta$) and
Im($\omega$) are shown to be uncorrelated.
