But in general that would mean knowing the state of everything the system had interacted
with in the past, since it is now entangled with them. So even if you suppose there is no
collapse of the wavefunction, decoherence has the same effect.
Brent
On 3/18/2014 2:52 PM, Jesse Mazer wrote:
Yes, if you have the exact present quantum state and you're assuming the normal quantum
rules for continuous wavefunction evolution, you can determine the past quantum state.
The answer might change if you assume that there's an objective physical reality to the
"collapse" of wavefunction with measurement, distinct from the normal wavefunction
evolution rules.
Jesse
On Tue, Mar 18, 2014 at 5:33 PM, LizR <[email protected]
<mailto:[email protected]>> wrote:
Am I right in assuming that in a quantum mechanical universe you can trace
the
history backwards?
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