Stuart Hameroff has been theorising about quantum consciousness and proto-consciousness existing generally in space. These quantum states are collapsed into moments of experience by (microtubules in) the physical brain. This means due to its quantum field nature, consciousness could re-coalesce elsewhere.
Stuart Hameroff on Singularity 1 on 1: Consciousness is More than Computation!
It's an interesting theory, but it seems very un-Zen to 'desire' afterlife :-
There are three attachments that are especially deep-seated in the
minds of all: greed, anger and infatuation, which are based on lust,
fear and pride. Back of these lies discrimination and desire which is
procreative and is accompanied with excitement and avariciousness and
love of comfort and desire for eternal life; and, following, is a
succession of rebirths on the five paths of existence and a
continuation of attachments. But if these attachments are broken off,
no signs of attachment nor of detachment will remain because they are
based on things that are non-existent; when this truth is clearly
understood the net of attachment is cleared away.
A Buddhist Bible: Self-Realisation, page 112