Scientists demonstrate quantum nature of entanglement swapping

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By synchronizing multiple lasers and then distributing them to different locations scientists have found a way to build a quantum repeater. The method can extend the distance that information can travel in quantum computers using entangling swapping ...
By synchronizing multiple lasers and then distributing them to different locations, scientists have found a way to build a quantum repeater. The method can extend the distance that information can travel in quantum computers using entangling swapping, where particles can become entangled without ever interacting due to a “go-between” particle.

As if plain old quantum entanglement weren’t strange enough for modern physics, now physicists are entangling already entangled particles. In entanglement swapping, one particle of an entangled pair becomes entangled with a third particle, which itself becomes entangled with the other particle in the first pair, even though the two never interact. Here’s how physicists are unraveling this behavior and manipulating it for use in quantum communications and high-speed computing.


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