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Researchers Take Two Big Steps Toward Quantum Computing

A green beacon laser is sent from the Jacobus Kapteyn Telescope on La Palma to Tenerife.

Two teams of Austrian researchers have made a pair of discoveries related to quantum entanglement.

Credit: University of Vienna

Two related teams of Austrian researchers have made a pair of discoveries related to quantum entanglement they describe in two new papers.

Quantum entanglement is the phenomenon in which two or more particles become linked in such a way that changes made to one affect the others, even if they are separated from each other.

In the first experiment, the researchers transmitted complex, quantum-encoded information through turbulent air using a free-space link. The researchers say the technique could have applications in quantum encryption and studying quantum physics.

In the second experiment, the researchers used a technique called entanglement swapping to create an entangled state between two isolated qubits located 143 kilometers apart. The researchers say the technique provides a solution to an aspect of quantum physics known as the "no-cloning theorem," which states it is impossible to create an identical copy of an unidentified quantum state.

The researchers believe strongly in the potential applications of this discovery, noting it "proves the feasibility of a crucial element for realizing a quantum repeater in a future space- and ground-based worldwide quantum Internet."

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Abstracts Copyright © 2015 Information Inc., Bethesda, Maryland, USA


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