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3rd November 2016

A virus-sized computing device

Researchers at University of California, Santa Barbara, have designed a functional nanoscale computing element that could be packed into a space no bigger than 50 nanometres on any side.

 

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In 1959, renowned physicist Richard Feynman, in his talk “Plenty of Room at the Bottom” spoke of a future in which tiny machines could perform huge feats. Like many forward-looking concepts, his molecule and atom-sized world remained for years in the realm of science fiction. And then, scientists and other creative thinkers began to realise Feynman’s nanotechnological visions.

In the spirit of Feynman’s insight, and in response to the challenges he issued, electrical and computer engineers at UC Santa Barbara have developed a design for a functional nanoscale computing device. The concept involves a dense, three-dimensional circuit operating on an unconventional type of logic that could, theoretically, be packed into a block no bigger than 50 nanometres on any side.

“Novel computing paradigms are needed to keep up with demand for faster, smaller and more energy-efficient devices,” said Gina Adam, a postdoctoral researcher at UCSB’s Department of Electrical and Computer Engineering and lead author of the paper “Optimised stateful material implication logic for three dimensional data manipulation” published in the journal Nano Research. “In a regular computer, data processing and memory storage are separated, which slows down computation. Processing data directly inside a three-dimensional memory structure would allow more data to be stored and processed much faster.”

While efforts to shrink computing devices have been ongoing for decades – in fact, Feynman’s challenges as he presented them in 1959 have been met – scientists and engineers continue to carve out room at the bottom for even more advanced nanotechnology. An 8-bit adder operating in 50 x 50 x 50 nanometre dimensions, put forth as part of the current Feynman Grand Prize challenge by the Foresight Institute, has not yet been achieved. However, the continuing development and fabrication of progressively smaller components is bringing this virus-sized computing device closer to reality.

“Our contribution is that we improved the specific features of that logic and designed it so it could be built in three dimensions,” says Dmitri Strukov, UCSB professor of computer science.

 

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Key to this development is a system called material implication logic, combined with memristors – circuit elements whose resistance depends on the most recent charges and the directions of those currents that have flowed through them. Unlike the conventional computing logic and circuitry found in our present computers and other devices, in this form of computing, logic operation and information storage happen simultaneously and locally. This greatly reduces the need for components and space typically used to perform logic operations and to move data back and forth between operation and memory storage. The result of the computation is immediately stored in a memory element, which prevents data loss in the event of power outages – a critical function in autonomous systems such as robotics.

In addition, the researchers reconfigured the traditionally two-dimensional architecture of the memristor into a three-dimensional block, which could then be stacked and packed into the space required to meet the Feynman Grand Prize Challenge.

“Previous groups show that individual blocks can be scaled to very small dimensions,” said Strukov, who worked at technology company Hewlett-Packard’s labs when they ramped up development of memristors. By applying those results to his group’s developments, he said, the challenge could easily be met.

Memristors are being heavily researched in academia and in industry for their promising uses in future memory storage and neuromorphic computing. While implementations of material implication logic are rather exotic and not yet mainstream, uses for it could pop up any time, particularly in energy-scarce systems such as robotics and medical implants.

“Since this technology is still new, more research is needed to increase its reliability and lifetime and to demonstrate large-scale, 3-D circuits tightly packed in tens or hundreds of layers,” Adam said.

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