Quantum Teleportation Reaches Farthest Distance Yet


Physicists have teleported a light particle 15 miles (25 kilometers), making it the farthest quantum teleportation yet.

Advances in quantum teleportation could lead to better Internet and communication security, and get scientists closer to developing quantum computers. About five years ago, researchers could only teleport quantum information, such as which direction a particle is spinning, across a few meters. Now, they can beam that information across several miles.

Physicists can’t instantly transport matter, but they can instantly transport information through quantum teleportation. This works thanks to a bizarre quantum mechanics property called entanglement. Quantum entanglement happens when two subatomic particles stay connected no matter how far apart they are. When one particle is disturbed, it instantly affects the entangled partner. It’s impossible to tell the state of either particle until one is directly measured, but measuring one particle instantly determines the state of its partner.

In the new, record-breaking experiment, researchers from the University of Geneva, NASA’s Jet Propulsion Laboratory and the National Institute of Standards and Technology used a superfast laser to pump out photons. Every once in a while, two photons would become entangled. Once the researchers had an entangled pair, they sent one down the optical fiber and stored the other in a crystal at the end of the cable. Then, the researchers shot a third particle of light at the photon traveling down the cable. When the two collided, they obliterated each other.

Quantum information has already been transferred dozens of miles, but this is the farthest it’s been transported using an optical fiber, and then recorded and stored at the other end. Other quantum teleportation experiments that beamed photons farther used lasers instead of optical fibers to send the information. But unlike the laser method, the optical-fiber method could eventually be used to develop technology like quantum computers that are capable of extremely fast computing, or quantum cryptography that could make secure communication possible.

Source: www.space.com

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