(ScienceDaily) Researchers from the University of Basel have succeeded in creating strong coupling between quantum systems over a greater distance. They accomplished this with a novel method in which a laser loop connects the systems, enabling nearly lossless exchange of information and strong interaction between them. The physicists reported that the new method opens up new possibilities in quantum networks and quantum sensor technology.
In their experiment, the researchers used laser light to couple the vibrations of a 100 nanometer thin membrane to the motion of the spin of atoms over a distance of one meter. As a result, each vibration of the membrane sets the spin of the atoms in motion and vice versa.
In addition to coupling atoms with nanomechanical membranes, the new method might also be used in several other systems; for example, when coupling superconducting quantum bits or solid-state spin systems used in quantum computing research. The new technique for light-mediated coupling could be used to interconnect such systems, creating quantum networks for information processing and simulations. Treutlein is convinced: “This is a new, highly useful tool for our quantum technology toolbox.”

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