Chinese send photons through water!

Chinese scientists have successfully sent information between stranded particles through seawater, and this is the first time that this type of quantum communication has undergone water.

In this experiment of experiment demonstration, information has been sent over 3.3 meters long seawater tanks, but scientists predict that the same technique can be used to send communications that is impossible to hunt up to 900 meters in the distance through the open sea and oceans.

"People have already talked about the idea of ​​underwater quantum communication, but I do not know for anyone who conducted such an experiment," said Thomas Jennewein from Waterloo University, Canada for New Scientist .

"Clear application would be a submarine that wants to stay under water and still communicate in a safe manner."

This is a big deal because quantum communication – also called quantum teleporation – allows people to send messages that are curiously protected from the laws of physics. If this is not the ultimate encryption, what is it then?

Quantum communication is based on the idea of ​​quantum intertwining – the strange phenomenon that Einstein referred to with the words "ghostly distance action". Basically, quantization means that the two particles are inextricably linked, and whatever happens one of them will have an impact on the other, regardless of the distance.

Through this mechanism scientists have already "teleported" information over huge distances through optical fibers and even open spaces

Earlier this year, another team of Chinese scientists had quantitatively interwoven teleported information on a satellite to Earth's orbit over 500 kilometers .

But no one has ever done so in the water, which is bad for spraying anything we've tried to direct through it. Just remember how the light beam of lasers in the air and the water behaves.

Scientists from Jiao Tong University in Shanghai took seawater from the Yellow Sea and dumped into a tank of three meters to carry out the experiment

They then created a couple of tangled photons, pointing the beam of light through the crystal. Whatever the polarization of a single photon, his pair automatically has the opposite polarization.

These particles were placed in the opposite ends of tanks, and scientists have shown that regardless of their separation and a few meters of seawater between them, they can still correctly transfer information between them in 98 percent of cases.

"Our results confirm the feasibility of the marine quantum channel, and represent the first step towards underwater quantum communication," the researchers wrote in the journal The Optical Society

Research is still at an early stage, and it is important that other teams replicate this result, but it remains to be seen whether the same thing can be achieved even at distances beyond the container.

Based on some calculations, scientists predict that it will be possible to achieve quantum communication over an open sea distance of up to 885 meters, using photons in the blue-green spectrum

New Scientist reports that other teams computed the limit of quantum communication at a distance of 120 meters

"Because water in the ocean absorbs light, reaching quantum communications at longer distances will be difficult," said Jeffrey Uhlmann, a physicist from the University of Missouri, Columbia.

As far as distance will be able to stretch this underwater quantum communication we will still see, but now that scientists have shown that this is possible, it is only a matter of time when the boundaries begin to move.

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