Chinese physicists teleported photons over a distance of 100 km


14/05/2012

We are accustomed to associate with science fiction teleportation, whereas in fact - it is no longer fiction. Two years ago, Chinese physicists have broken the record for the distance quantum teleportation, teleport photons over a distance of 16 km. The new achievement of the same team again hit record distance, photons moving at 97 kilometers.

Quantum teleportation does not look exactly as it is presented in "Star Trek." When teleporting a photon moves not the photon, and the information that describes it. This is achieved by means of quantum entanglement. In fact, the second photon is the same as the first, turning in identical qubit of information. When this information itself is not transmitted, but instead is being transmitted quantum states.

If it sounds weird and scary, you’re not alone. Even Albert Einstein called the process of quantum entanglement "intimidating action at a distance."

The ability to beam information to create a global system of communication that can not hear. As in the case of quantum teleportation, the information does not pass any intermediate distances, that, accordingly, there is no possibility interception. As noted in the edition of Technology Review, "it is clear that their goal is to create a satellite system of quantum cryptography, which will provide Ultrasafe informational message around the world."

The complexity of this process is that the entangled photons - a very fragile objects. They can not be shipped via optical cable to a distance greater than kilometer, since the photons interact with the glass shattering confusion. This significantly limits the applicability of quantum cryptography in practice.

So Chinese physics, in this case, use another method of teleportation of photons - through the atmosphere.

Original: Technologyreview.com


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