Near-faithful quantum teleportation of data demonstrated

New York Times : Scientists in the Netherlands have achieved a new milestone in quantum teleportation: the near-faithful transmission of an arbitrary quantum state over a distance of about 3 m. The feat depends on a quirky phenomenon of quantum mechanics called quantum entanglement. With entangled particles, the state of one particle automatically affects the state of the other. Hence, by measuring certain quantum properties of one of an entangled pair of particles, those of the other can be determined instantaneously, no matter the distance between them. The researchers put that to the test by creating qubits from electrons trapped in diamonds at extremely low temperatures. They then were able to observe their spin. Because the spins of entangled particles are correlated, observations made of the state of one qubit revealed the state of another up to 3 m away. What’s more, thanks to an additional entanglement step, the new scheme achieved a teleportation fidelity of 86%. If the researchers can show that such a feat can be performed reliably over much greater distances, the technique could one day be used to speed up computing systems and make them much more secure.