How two photons can be connected in a way that seems to defy the very nature of space and time, yet still obey the laws of quantum mechanics.

 

How can two photons can be connected in a way that seems to defy the very nature of space and time, yet still obey the laws of quantum mechanics?

 

Physicists at the University of Geneva achieved the weird result by creating a pair of 'entangled' photons, separating them, then sending them down a fibre optic cable to the Swiss villages of Satigny and Jussy, some 18 kilometres apart.

The researchers found that when each photon reached its destination, it could instantly sense its twin's behaviour without any direct communication. The finding does not violate the laws of quantum mechanics, the theory that physicists use to describe the behaviour of very small systems. Rather, it shows just how quantum mechanics can defy everyday expectation, says Nicolas Gisin, the researcher who led the study. "Our experiment just puts the finger where it hurts," he says. The study is published in 'Nature'..

 

Spooky and unsettling

In the everyday world, objects can organize themselves in just a few ways. For example, two people can coordinate their actions by talking directly with each other, or they can both receive instructions from a third source.

In both these cases, the information is communicated at or below the speed of light, in keeping with Einstein's axiom that nothing in the Universe can go faster. But quantum mechanics allows for a third way to coordinate information. When two particles are quantum mechanically 'entangled' with each other, measuring the properties of one will instantly tell you something about the other. In other words, quantum theory allows two particles to organize themselves at apparently faster-than-light speeds.

Einstein called such behaviour "spooky action at a distance", because he found it deeply unsettling. He and other physicists clung to the idea that there might be some other way for the particles to communicate with each other at or near the speed of light.

But the new experiment shows that direct communication between the photons (at least as we know it) is simply impossible. The team simultaneously measured several properties of both photons, such as phase, when they arrived at their villages and found that they did indeed have a spooky awareness of each other's behaviour. On the basis of their measurements, the team concluded that if the photons had communicated, they must have done so at least 100,000 times faster than the speed of light - something nearly all physicists thought would be impossible. In other words, these photons cannot know about each other through any sort of normal exchange of information.

 

Framed

The team also ruled out other possible reasons for the apparently coordinated behaviour. For example, one could imagine that the photons might have shared information before they left Geneva - but Gisin's measurements showed that they could not.

A second test ensured that the scientists in the two villages weren't missing some form of communication thanks to Earth's motion through space. According to Einstein's theory of relativity, observers moving at high speeds can have different 'reference frames', so that they can potentially get different measurements of the same event. The Geneva results could possibly be explained if the two photons were communicating through a frame of reference that wasn't readily apparent to the scientists."

But theoretical calculations2 have shown that performing tests over a full spin of the globe would test all possible reference frames. The team did just that, and they got the same result in all cases.

The bottom line, says Gisin is that "there is just no time for these two photons to communicate".

The experiment shows that in quantum mechanics at least, some things transcend space-time, says Terence Rudolph, a theorist at Imperial College London. It also shows that humans have attached undue importance to the three dimensions of space and one of time we live in, he argues. "We think space and time are important because that's the kind of monkeys we are."

If you are baffled by the result, fear not - you're not alone. "For me, honestly, it doesn't make any sense," says Gisin. "I don't think we can today claim that we have a good story to tell how this all happens." He hopes that the work will stimulate theorists to come up with new ways of explaining the spooky effect. 

 

How about this for an explanation (mine):

 

The 'two particles' are not separate as they would seem to be, but appear that way through the decoding process (observation) of human consciousness. When not observed, they retain their waveform appearance and are part of the same information field. Because all things are 'one' and part of the same holographic 'reality' there is no 'movement faster than light' and no journey 'faster than light' to be made. The waveform is both 'here' and 'there' simultaneously.

 

A good analogy is that of a small droplet or pool of liquid being observed as spreading out in all directions on a flat surface. When one edge reaches an object or location, the opposite edge knows because it is one entity and the information is shared instantly across the whole. At another level however, there is no pool, nor movement, just an information field that we decode into what we observe.

 

Also, scientists are missing the point in trying to explain phenomena in material terms. Consciousness is non-physical and 'space and time' are illusory concepts produced by consciousness. There is no 'space and time' except that which appears to exist within our individual and collective frames of reference.