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Aug
28
comment Reversing gravitational decoherence
@RonMaimon: Your comments contain a flase premise, namely that a field will remain static if you introduce a particle in a superposition of states which couple differently to the field. That is not true in general, though it can be true in specific instances. Obvious examples of fields being effected by particles in them include Bremsstralung radiation and the Jaynes-Cummings model.
Aug
27
comment Reversing gravitational decoherence
This delocalisation appears locally as decoherence (even though it is not true decoherence).
Aug
27
comment Reversing gravitational decoherence
@RonMaimon, I mean that gravity couples the system to its environment, and so you get a change in the environment over time depending on the state of the system, and hence the reduced density matrix becomes mixed. As regards unitaries, I was refering to the general case. Even if you think about a static EM field, this induces a unitary transformation on the system (no decoherence, but it is altered) and to recover the initial state you need to apply another unitary. In the general case, states can become delocalised, mixing the reduced density matrix, even if the global state remains pure.
Aug
27
answered Reversing gravitational decoherence
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