The infinitesimal symmetry $\delta=\epsilon[Q,\cdot]$ for particle (anti-particle) conservation is as usually generated by the corresponding Noether charge $Q$, i.e. the total number operator for particles (anti-particles), respectively.

The infinitesimal symmetry $\delta=\frac{\epsilon}{i\hbar}[\cdot,Q]$ for particle (anti-particle) conservation is as usually generated by the corresponding Noether charge $Q$, i.e. the total number operator for particles (anti-particles), respectively.