Russian scientists turned back the clock with a quantum computer

A team of scientists led by Gordey Lesovik, a quantum physicist at the Moscow Institute of Physics and Technology, managed to conduct an experiment in which time went backwards. And even though the shift itself was tiny, only a split second - but it was officially recorded. Researchers have succeeded in putting a quantum computer into a state that develops in the opposite direction to the arrow of time we are used to.

In the course of the research, scientists conducted more than a thousand separate experiments with a quantum system from IBM. They used two types of architecture - a simple one for two qubits and a more complex one for three. One of the goals of the experiments was to test the hypothesis about the possibility of violating the second law of thermodynamics at the quantum level. Specifically, the question was: can time spontaneously turn back for at least one particle, the behavior of which is controlled by the laws of quantum physics?

It turned out that this is quite possible - albeit under a number of conditions. For example, the probability of success for a system of two qubits is only about 80%, and for a system of three it is only 49%. But Lesovik has already admitted that the experiments revealed errors in the algorithms, so the results could be improved many times over. And this opens up opportunities for further breakthroughs in the field of quantum physics.

Alas, time travel at the quantum level cannot bring any benefit yet. This is a purely scientific achievement that is of interest only to specialized specialists. For example, scientists want to build a self-checking quantum computer that can move a control module over time. And instead of correcting erroneous results, the computer will simply go back, make corrections, and do the job again.