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Flipping the switch

Harvard researchers have succeeded in creating quantum switches that can be turned on and off using a single photon, a technological achievement that could pave the way for creating highly secure quantum networks.

Built from single atoms, the first-of-their-kind switches could one day be networked via fiber-optic cables to form the backbone of a “quantum Internet” that allows for perfectly secure communications, said Professor of Physics Mikhail Lukin, who, together with Professor Vladan Vuletic of MIT, led a team [… ]“Conceptually, the idea is very simple: Push the conventional light switch to its ultimate limit. What we’ve done here is to use a single atom as a switch that, depending on its state, can open or close the flow of photons … and it can be turned on and off using a single photon.”

Though the switches could be used to build a quantum computer, Lukin said it’s unlikely the technology will show up in the average desktop computer.

Where it will be used, he said, is in creating fiber-optical networks that use quantum cryptography, a method for encrypting communications using the laws of quantum mechanics to allow for perfectly secure information exchanges. Such systems make it impossible to intercept and read messages sent over a network, because the very act of measuring a quantum object changes it, leaving behind telltale signs of the spying.

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