Whether It’s Woven Fabric or a Blanket, Entangled Photons in a Mesh Studied for ~ Large Scale Quantum Processor

Weaving quantum processors out of laser light

Excerpts and salient points ~

+  An international team of scientists from Australia, Japan and the United States has produced a prototype of a large-scale quantum processor made of laser light.

+  Based on a design ten years in the making, the processor has built-in scalability that allows the number of quantum components – made out of light – to scale to extreme numbers.

“While today’s quantum processors are impressive, it isn’t clear if the current designs can be scaled up to extremely large sizes,” notes Dr Nicolas Menicucci, Chief Investigator at the Centre for Quantum Computation and Communication Technology (CQC2T) at RMIT University in Melbourne, Australia.

+  Quantum computers promise fast solutions to hard problems, but to do this they require a large number of quantum components and must be relatively error free. Current quantum processors are still small and prone to errors. This new design provides an alternative solution, using light, to reach the scale required to eventually outperform classical computers on important problems.

“Our approach starts with extreme scalability – built in from the very beginning – because the processor, called a cluster state, is made out of light.”

+  Using light as a quantum processor

+  A cluster state is a large collection of entangled quantum components that performs quantum computations when measured in a particular way.

+  “To be useful for real-world problems, a cluster state must be both large enough and have the right entanglement structure. In the two decades since they were proposed, all previous demonstrations of cluster states have failed on one or both of these counts,” says Dr Menicucci. “Ours is the first ever to succeed at both.”

+  To make the cluster state, specially designed crystals convert ordinary laser light into a type of quantum light called squeezed light, which is then weaved into a cluster state

Source:  Centre for Quantum Computation & Communication Technology.  Dr Nick Menicucci, RMIT, Dr Hidehiro Yonezawa and Dr Shota Yokoyama from UNSW Canberra,  Weaving quantum processors out of laser light…

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