On 4/28/2018 9:39 AM, [email protected] wrote:
Is it a settled issue whether measurements in QM are strictly irreversible,
There are interactions that, if you did not arrange that they be erased, would constitute measurements. Whether you say they were measurements and then got erased or they are not measurments because they didn't produce an irreversible record is a phlosophical or semantic question.
that is irreversible in principle, or just statistically irreversible, that is, reversible but with infinitesimal probability? TIA,
The equations are all reversible so you might say they are reversible with infinitesimal probability...but in most cases that reversal would mean catching and reversing photons that are already on their way outbound beyond the orbit of the Moon.
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