The frame: the film “the time Machine”
Scientists from Russia, USA and Switzerland calculated the probability of spontaneous return of an electron in the past, and also drew time for a quantum computer. The results of the study reported in a press release on Phys.org.
Physicists have studied the behavior of a single electron in empty interstellar space. They admitted that at the moment of observation the particle is localized, that is, its position is known with high accuracy. The change in the quantum state of the particle described by the schrödinger and in accordance with the position of the electron will become increasingly uncertain. This process obeys the Second law of thermodynamics, according to which in an isolated system there is an increase in entropy.
However, the schrödinger equation assumes that the change of state of an electron is reversible, i.e. it may again be localized in a small region of space. This is not observed in nature, but could theoretically occur due to random fluctuations in the cosmic microwave background, penetrating the Universe. According to calculations, if every second to watch 10 billion of localized electrons, for 13.7 billion years back the state change happens only once. The particle will return to its past just one ten-billionth fraction of a second.
The researchers also tried to turn back time in an experiment with a quantum computer consisting of two or three qubits. First, the two qubit was in the ground state, denoted by 0, which corresponds to the localized electron. Then, place the evolution of the state, and a special program has changed the state of the computer so that he could go back in time, as occurs with the electron when fluctate microwave background. In other words, the values of the qubits has paramutabilis in the past.
It turned out that the computer with two qubits back to its original condition in 85 percent of cases. If the qubits were three, then there were more errors and the program return successfully worked only in 50 percent of cases. However, scientists believe that the improvement of quantum computer, the frequency of failures will decrease. The results will make computational devices based on qubits is more accurate.
Video, photo All from Russia.