What happens if you annihilate a particle with antimatter, while this particle is in entangled state with another particle????

Will the other entangled particle vaporise also???

If so, than this would mean that anti-matter engines could run much more efficiently, as one anti-matter collision would effect more regular matter particles.......

if you you annihilate an entangled particle with an antiparticle, the annihilation will produce some (eg) photons. these photons will be entangled with whichever [anti]particle the original particle was entangled with. the entanglement propogates until the wavefunction collapses. annihilation reactions don t [necessarily] affect this.