Scientists
have reversed the direction of time with a quantum computer. The breakthrough
study seems to contradict basic laws of physics and could alter our
understanding of the processes governing the universe. In a development that
also represents a major advance in our understanding of quantum computers, by
using electrons and the strange world of quantum mechanics, researchers were
able to turn back time in an experiment that is the equivalent of causing a
broken rack of pool balls to go back into place.
Anyone
watching the computer would see the event as if time had turned backwards. The
researchers - from the Moscow Institute of Physics and Technology and helped by
colleagues in Switzerland and the US - expect the technique to improve in time,
becoming more reliable and precise with time. Lead researcher Dr Gordey
Lesovik, who heads the Laboratory of the Physics of Quantum Information at the
Moscow Institute of Physics & Technology (MIPT), said:
“We have
artificially created a state that evolves in a direction opposite to that of
the thermodynamic arrow of time.”
The
"time machine" described in the journal Scientific Reports consists
of a rudimentary quantum computer made up of electron "qubits". A
qubit is a unit of information described by a "one", a
"zero", or a mixed "superposition" of both states.
In the experiment,
an "evolution program" was launched which caused the qubits to become
an increasingly complex changing pattern of zeros and ones. During this
process, order was lost - just as it is when the pool balls are struck and
scattered with a cue. But then another program modified the state of the
quantum computer in such a way that it evolved "backwards", from
chaos to order.
It meant the
state of the qubits was rewound back to its original starting point. Most laws
of physics work both ways, in the future and the past. If you see a video of a
pool ball knocking into another one, for instance, and then reverse that same
video, the physical processes would both make sense and it would be impossible
at the level of physics to know which way around would be correct.
But the
universe does have one rule that goes only in one way: the second law of
thermodynamics, which describes the progression from order to disorder.
If you saw a
video of someone breaking a perfectly arranged triangle of pool balls into a
mess, for instance, then watching that backwards would obviously look
nonsensical.
The new
experiment is like giving the pool table such a perfectly calculated kick that
the balls rolled back into an orderly pyramid. The scientists found that,
working with just two qubits, "time reversal" was achieved with a
success rate of 85 per cent. When three qubits were involved more errors
occurred, resulting in a 50 per cent success rate. The error rate is expected
to drop as scientists improve the devices used to be more sophisticated, the
researchers behind the discovery said.
The
experiment could have a practical application in the development of quantum
computers, the scientists said.
"Our
algorithm could be updated and used to test programmes written for quantum
computers and eliminate noise and errors," said Dr Lesovik.
This article
was originally published on the Independent.
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