From what I can find, presently the only known means of producing antimatter consist of directing particle accelerators at various targets, and only infrequently getting positrons or anti-protons as byproducts of particle interactions.
Assuming a sufficiently large source of energy: Have more efficient means of producing antimatter been conceived?
And based on these is there a known upper bound on antimatter production efficiency? For example:
- If all known theory requires that an anti-particle be produced with its particle pair, then efficiency will always be under 50%.
- Are there known processes for "transmuting" matter into anti-matter? If so, do these allow for a theoretical upper-bound on production greater than 50% of input energy?