During the past three decades, the theory of quantum communication and computing has progressed with the addition of new protocols and algorithms. However, implementing these theories in order to design a future quantum Internet is a continuing challenge because actually building the technology required for processing quantum information, such as the still elusive quantum repeater, has proven extremely difficult.
Anton Zeilinger, a researcher at the University of Vienna, is one of the pioneers in quantum communication; his group in Austria realized the first teleportation of photons in 1997. On Monday, Zeilinger and his team published two papers in the Proceedings of the National Academy of Sciences (PNAS) that report a breakthrough in the teleportation of entanglement. They generated entanglement between independent qubits over a record distance of 143 kilometers, linking the Canary Islands of La Palma and Tenerife. They also achieved entanglement of twisted photons across a distance of 3 km.
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