[snarks_when_bored]

Adrian Schwinger (at least as much a big dog physics guy as Feynman was) believed Feynman's view of quantum mechanics to be fundamentally flawed. It has to do with reconciling Maxwell's equations with quantum theory.

If Feynman is correct I read that quantum computation is possible, and, if not, is not.

The Schwinger-Tomonaga operator-theoretic approach to quantum electrodynamics was shown to be equivalent to the Feynman sum-over-histories approach by none other than Freeman Dyson (an act which secured Dyson a permanent faculty appointment at the Institute for Advanced Studies).

[Iris7]

I read about that in Dyson's "Disturbing the Universe". The famous trip from the East coast to New Mexico.

My understanding is that Schwinger rejected the Feynman model until the day he died. My hazy recollection is that it had something to do with a "particle's" electrical field. Something about Feynman's analysis seeing a particle as "pointlike". Something about Maxwell's mathematical model.