0:00:02on the basis nets and time symmetrical we measurements
0:00:07everybody knows the direction of that from the past so but you
0:00:15but what would be different at the time or backward
0:00:21the microscopic work is invariant under time reversal if you invert the velocities and the
0:00:27motion looks natural and is described my best same equations
0:00:34in contrast to the microscope reverse ability macroscopic processes are usually irreversible because of the
0:00:41second vowel herman i not
0:00:44only the dynamics of work will address space is irreversible that's what was done on
0:00:49microscopic or equilibrium systems
0:00:54we gather information about the state of a system by measurements
0:00:59a generic measurement skiing this sequence of that vector preparation in standing direction would assist
0:01:05them and try not to read out
0:01:11most measurements than classic are and basically we just of assistant
0:01:16is that there might and power off time
0:01:23but if we decrease the string corpora measure and then it will be less and
0:01:27less is there such a week measurement is the not in a c t expensive
0:01:33to large uncertainty in the measurement
0:01:40in the limit we obtain the idea non-invasive measurement
0:01:48imagine our system in a stationary time symmetrically equilibrium state if you measure not basically
0:01:55quantity three subsequent times separated by two one and he tool
0:02:03then the time reversal operation would be equivalent to swiping q one and t two
0:02:13whether or not such a time reversal operation using the same measurement results can be
0:02:18checked or classical and quantum mechanical
0:02:27more classical and quantum measurements are non invasive inventing it or banishing straight
0:02:33at the question is no problem measurement results also time symmetry
0:02:41surprisingly we find but non invasive measurement results are time symmetric classic early but not
0:02:48quantum mechanical this apparent time-reversed has symmetric break increasing use up and fundamental difference between
0:02:55classical and quantum account