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| Wormhole - Mark Garlick , Corbis |
Could time travel soon become a reality? Physicists simulate sending quantum light particles to the past for the first time
University of Queensland researchers say photons can move through time
A simulation of two wormhole-travelling photons found they could interact
This suggests, at the smallest scales, jumping through time is possible
The experiment could solve some famous theories that 'prevent' time travel
But whether this will be possible on a larger scale remains to be seen
A group of scientists have, for the first time, simulated how two time-travelling photons would interact, suggesting that, at a quantum level at least, jumping through time might be possible.
The study used photons - single particles of light - to simulate quantum particles travelling back through time. By studying their behaviour, the scientists revealed possible bizarre aspects of modern physics.
In the simulation, the researchers examined two possible outcomes for a time-travelling photon.
For the first, ‘photon one’ would travel through a wormhole into the past and interact with its older version, reports The Speaker.
In the second, ‘photon two’ travels through normal space-time but interacts with a photon that is stuck in a time-travelling loop through a wormhole, known as a closed timelike curve (CTC).
Simulating the behaviour of photon two allowed the behaviour of photon one also to be studied - and the results revealed that time travel on a quantum level seems to be possible.
By definition ‘quantum’ refers to the smallest possible particles that can independently exist - such as photons.
However, whether this same simulation proves time travel is possible for more larger particles or groups of particles, such as atoms, remains unclear.
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| Photon in wormhole (Martin Ringbauer) |
In 1991 it was first predicted that time travel would be possible in the ‘quantum world’ because quantum particles behave almost outside the realms of physics.
'The properties of quantum particles are "fuzzy" or uncertain to start with, so this gives them enough wiggle room to avoid inconsistent time travel situations,' said professor Timothy Ralph, one of the researchers on the latest study. The results also give a better understand to how two theories in physics, on the biggest and smallest scales, are able to relate to one another.
'The question of time travel features at the interface between two of our most successful yet incompatible physical theories ' Einstein's general relativity and quantum mechanics,' said PhD student Martin Ringbauer from the University of Queensland. 'Einstein's theory describes the world at the very large scale of stars and galaxies, while quantum mechanics is an excellent description of the world at the very small scale of atoms and molecules.'
Einstein's theory suggests the possibility of travelling backwards in time by following a space-time path that returns to the starting point in space but at an earlier time - a closed timelike curve (CTC).
This possibility has puzzled physicists and philosophers alike since it was discovered by Austrian-American scientist Kurt Gödel in 1949, as it seems to cause paradoxes in the classical world. These include the 'grandparents paradox', where a time traveller could stop their grandparents from meeting, thus preventing the time traveller's birth. This would make it impossible for the time traveller to have set out in the first place. But this new research suggests such interactions are indeed possible - albeit only on a quantum level for now.
Source - http://www.dailymail.co.uk/sciencetech/article-2665781/Could-time-travel-soon-reality-Physicists-simulate-quantum-light-particles-travelling-past-time.html
RELATED
YOU CAN CHANGE THE PAST, SAYS PHYSICIST
It works with microscopic particles, and it's part of that mysterious quantum world
Can the past be changed by the FUTURE? Bizarre quantum experiment by Professor Kater Murch suggests time can run backwards
Scientists probed the quantum mechanical properties of single particles
The particles don't have a fixed state until they are observed by scientist
Study found knowing future outcome of particle also changes initial state
They believe particles change their state due to scientist's knowledge
This suggests that time could runs both backwards and forwards
If this proves true, it could mean that we're doing now has been influenced by the decision made by a future version of us, the study claims
The theory follows another postulated by scientists back in December.
They proposed that at the moment of the Big Bang (illustrated),
a 'mirror universe' to our own was created that moves in the opposite direction through time -
and intelligent beings in each one would perceive the other to be moving backwards
Scientists in the US have devised a series of new experiments to probe the quantum mechanical properties of single particles.
These particle have a state that is not merely unknown, but totally undefined before it is measured.
The act of measurement itself that forces the particle to collapse to a definite state - as evidenced in the infamous Schrödinger's cat thought experiment.
Professor Kater Murch at Washington University has found that by knowing the future outcome of a particle, its state in the past altered. Without knowing the information, the state is more likely to remain the same. In other words, knowing future events can change the past.
If this proves true in our 'classical' world, it would mean that what we're doing now has been influenced by the decision made by a future version of us.
This all remains theory, but physicists have created devices that allowed them to measure these fragile quantum systems to see if this really is the case in the quantum world.
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