There is no 1 gram space probe to Alpha Centauri. Unless you are into LSD like your favorite professor
LSD can go anywhere, no nuclear decay needed
Wow. You forgot that it is a proposal now. Of course it doesn't exist.
The probe does not exist
The laser does not exist
The mini solar sail does not exist
The mini nuclear reactor does not exist
The mini receiver transmitter does not transmit
Why not include a mini fusion reactor and quantum digital camera and tickets to the Grateful Dead reunion
Again if all the parts do not exist the proposal is not real, but that does not stop suckers like you from getting fooled.