Yes. See the citations in this SEP article. If I recall correctly, you upload a human into a quantum computer, and then that uploaded human observes a system that is in a superposition of states xy. The human can be decomposed into two factors, aotimesb, where the second factor is capable of remembering the result of the observation and the first factor is only capable of remembering the fact that an observation has been made. Before the observation, the system is
%20)
and afterwards, it’s
a′otimesb_xotimesxa′otimesb_yotimesy
Now the evolution
%20\mapsto%20b_x%20\otimes%20x%20+%20b_y%20\otimes%20y) is a unitary transformation, so you can undo that process without affecting the state a′. Then we’re left with the state
)
Now we communicate with the human, who tells us that they remember observing the mixed state, but they cannot remember what they observed. Then we verify that indeed, the mixed state is still mixed, despite having been observed by a human. That’s what MWI predicts, anyways.
This is one of those models fighting a “straw collapse”. The orthodox approach is “this is the math, shut up and calculate”. Until the MWI math is different from “unitary evolution+Born rule”, it’s indistinguishable from collapse.
Yes. See the citations in this SEP article. If I recall correctly, you upload a human into a quantum computer, and then that uploaded human observes a system that is in a superposition of states x y. The human can be decomposed into two factors, aotimesb, where the second factor is capable of remembering the result of the observation and the first factor is only capable of remembering the fact that an observation has been made. Before the observation, the system is
and afterwards, it’s
a′otimesb_xotimesx a′otimesb_yotimesy
Now the evolution
Now we communicate with the human, who tells us that they remember observing the mixed state, but they cannot remember what they observed. Then we verify that indeed, the mixed state is still mixed, despite having been observed by a human. That’s what MWI predicts, anyways.
This is one of those models fighting a “straw collapse”. The orthodox approach is “this is the math, shut up and calculate”. Until the MWI math is different from “unitary evolution+Born rule”, it’s indistinguishable from collapse.
Those computations wouldn’t really be humans doing their regular human thing… you’d have to suspend the ‘human’ program for parts of that experiment.