In the theories of relativity are closed curves in space-time allows, to which we return to the starting point returns. This can lead to conflicting situations, such as the famous grandfather paradox. What if you kill his grandfather so that you never born?
In a new theory, the closed curves behave as quantum channels, which are used in entanglement experiments. This is consistent curves can select in the experiment. It sends a billionth of a second qubit in the past where it should destroy itself.
Only the photons that do not commit suicide, manage the trip. Even without real-time travel, you can simulate events in the experiment, producing an equivalent result. In complicated entanglement experiment with a quantum cannon, shows that the suicide does not occur.
Source: physorg.com
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