Quantum simulation gives a sneak peek into the possibilities of time reversal. An international team of scientists led by the U.S. Department of Energy’s (DOE) Argonne National Laboratory returned a computer briefly to the past. It suggests new paths for exploring the backward flow of time in quantum systems. They also open new possibilities for quantum computer program testing and error correction.
To achieve the time reversal, the research team developed an algorithm for IBM’s public quantum computer that simulates the scattering of a particle. In classical physics, this might appear as a billiard ball struck by a cue, traveling in a line...
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