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$B^0$--$\bar B^0$ Entanglement offers a conceptual alternative to the singlecharged B-decay asymmetry for the measurement of the direct CP violating$\gamma/\phi_3$ phase. With $f=J/\Psi K_L,J/\Psi K_S$ and$g=(\pi\pi)^0,(\rho_L\rho_L)^0$ the 16 time-ordered double decay rateIntensities to $(f, g)$ depend on the relative phase between the the $f$- and$g$-decay amplitudes given by $\gamma$ at tree-level. Several constrainingconsistencies appear. An intrinsic accuracy of the method at the level of $\pm1^\circ$ could be achievable at Belle-II with an improved determination of thepenguin amplitude to $g$-channels from existing facilities.

$B^0-\bar B^0$ entanglement for an ideal experiment on the direct CP violation $\phi_3/\gamma$ phase