Scientists quantum teleport information 90 miles across islands
European and Canadian scientists are pushing the envelope on quantum teleportation after having succeeded in beaming quantum states across some 90 miles in the Canary Islands.
The laser-locked telescopes on the islands of La Palma and Tenerife served as transporter rooms, teleporting information about the state of a pair of "entangled" particles.
The entanglement links the particles such that a change in one is registered in the other despite great distances between them.
Quantum teleportation was first demonstrated in 1997, but distances are growing longer. A Chinese team of researchers also reported teleporting quantum states across a significant distance, 60 miles, in the journal Nature this month.
Sources and more information:
• Quantum Teleportation Achieved over Record Distances
Two teams of researchers have extended the reach of quantum teleportation to unprecedented lengths, roughly equivalent to the distance between New York City and Philadelphia. But don't expect teleportation stations to replace airports or train terminals - the teleportation scheme shifts only the quantum state of a single photon.
• Open-air quantum teleportation performed across a 97km lake
Sending signals through fiber optic cable is reliable and fast, but because of internal absorption and other effects, they will lose photons - which is a problem when the number of photons being sent is small. This is of particular concern in quantum networks, which typically involve a small number of entangled photons.
• Quantum teleportation achieved over record distances
• Open-air quantum teleportation performed across a 97km lake
• Quantum teleportation achieved as Chinese researchers send data across a lake
( via news.cnet.com )
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