Researchers used a quantum computer to simulate time travel and showed that
The simulation involved two hypotheticalhuman, Alice and Bob, each of which has a qubit - a quantum bit of information. During the experiment, Alice sent her qubit to the past, but at some point Bob intervened in it and changed the information in it. However, despite the changes, Alice was able to recover the information when the qubit returned.
This way we can actually see thathappens to a complex quantum world if we travel in time, add a little damage and come back. We found that this does not harm the present, which means there is no butterfly effect in quantum mechanics.
Nikolay Sinitsyn, co-author of the work
The researchers repeated the experiment and foundthat simulating a qubit's return to the past and damaging it has virtually no effect on the information it carries. This effect can be applied in areas where quantum devices must carry secret information. Data can be hidden by transforming the original state into an entangled state.
“We found that even if an attackerproduces manipulations in a highly entangled state, we can still easily recover useful information, since this damage does not increase when decoding, ”the scientists noted.
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