224 reputation
12
bio website theory.caltech.edu/~preskill
location
age
visits member for 2 years, 2 months
seen Aug 28 '12 at 15:59

Aug
27
awarded  Yearling
Aug
29
awarded  Nice Answer
Aug
28
comment Reversing gravitational decoherence
Yes, I think that is correct. Penrose's proposal is very speculative. His estimate of the decoherence rate is far higher than standard gravitational theory would indicate.
Aug
27
comment Reversing gravitational decoherence
I'm sorry I was unclear. I meant to consider an interference experiment in which a particle can travel along either path 1 or path 2 between spacetime points A and B, where neither path is a geodesic. Then the particle emits radiation, but my point is that if the radiation is very soft we won't be able to learn whether the particle followed path 1 or path 2 by measuring the radiation field. Therefore, the two paths can interfere.
Aug
27
awarded  Teacher
Aug
27
answered Reversing gravitational decoherence