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Pioneering research in quantum computing reveals that time advances and recedes, reversing much of what we know about the nature of time.
A team of quantum physicists from the National University of Singapore discovered that time behaved differently. models.
They say that what is true at the quantum level is true also for the rest of the universe
What is Causal Asymmetry?
It's pretty obvious to everyone that time always goes, never backward. It makes sense that 7:00 rolls in 7:01, Monday through Tuesday, and mature in the senior years and eventually to death.
This understanding of time also applies to conventional computers, which store information as one of two states, 0 or 1. It is much less difficult for computers to understand what will arrive at the system in the future only to predict what has happened in the past based on the information that it has in the present.
This is what is called causal asymmetry, the idea that a system needs fewer resources to move forward than to retreat. In the real world, it is widely known as cause and effect. One thing is happening now that is causing something else in the future. What happens in the future can not affect what happened in the past.
Information theorists have long assumed that causal asymmetry is a fundamental property of the universe. In 1927, astrophysicist Arthur Eddington proposed that causal asymmetry is why time is moving forward, not backward.
Think of the universe is a massive cosmic computer. It takes a lot less information to advance in time than in the past.
No causal asymmetry in quantum computers
In a study published in Physical Review X the team of quantum scientists questions the prevailing theory of the & ordinateurs ordinateurs 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 1945 causal asymmetry. . The new paper explains how the linear movement of time in the future could be a relic of the bygone era of classical computer science.
Using theoretical quantum computers, the researchers found that causal asymmetry did not exist in quantum models. They say that what applies to a quantum computer also applies to massive objects in the universe.
Quantum physics is the study of very small particles exhibiting strange behaviors that are not obvious at the highest level. What is true for quantum particles is also true for massive objects, even when our limited tools prevent us from perceiving these behaviors.
This means that if causal asymmetry does not exist at the quantum level, it does not exist either. The Universe
How Do Quantum Computers Work
Unlike conventional computers, quantum computers store information in subatomic particles that can exist in more than one state at a time. Quantum and classical computers can easily predict what happens in very orderly systems (like a pendulum) or very random (like a gas-filled chamber).
The researchers looked at systems with just the right amount of disorder and randomness, such as weather systems. They discovered that quantum computers studying these systems could go from the front and back without using more memory than going in one direction.
"Although classically, it may be impossible for the process to go in one of the directions.] Our results show that" quantum mechanically ", the process can go both ways using very little memory" , says Jayne Thompson, complexity theorist and quantum physicist at NUS.
The researchers point out that their discovery does not mean is zero causal asymmetry at every point in the universe. "Thompson says it's possible that a quantum model exists that demonstrates causal asymmetry.
The team hopes to find out if they can design models where this phenomenon exists.
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