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Quantum Computers

Harnessing electron spin: Toward a new breed of computers that can process data using less power

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TechAndComputer (June 23, 2011) — Physicists at the University of Arizona have achieved a breakthrough toward the development of a new breed of computing devices that can process data using less power.

In a recent publication in Physical Review Letters, the physicists propose a way to translate the elusive magnetic spin of electrons into easily measurable electric signals. The finding is a key step in the development of computing based on...

TechAndComputer (June 23, 2011) — Physicists at the University of Arizona have achieved a breakthrough toward the development of a new breed of computing devices that can process data using less power.

In a recent publication in Physical Review Letters, the physicists propose a way to translate...

First telecommunications wavelength quantum dot laser grown on a silicon substrate

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TechAndComputer (June 14, 2011) — A new generation of high-speed, silicon-based information technology has been brought a step closer by researchers in the Department of Electronic and Electrical Engineering at UCL and the London Centre for Nanotechnology. The team's research, published in the journal Nature Photonics, provides the first demonstration of an electrically driven, quantum dot laser grown directly on a silicon substrate (Si) with a...

TechAndComputer (June 14, 2011) — A new...

Ultrathin copper-oxide layers behave like quantum spin liquid

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TechAndComputer (June 11, 2011) — Magnetic studies of ultrathin slabs of copper-oxide materials reveal that at very low temperatures, the thinnest, isolated layers lose their long-range magnetic order and instead behave like a "quantum spin liquid" -- a state of matter where the orientations of electron spins fluctuate wildly. This unexpected discovery by scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory and...

TechAndComputer (June 11, 2011) — Magnetic...

Quantum knowledge cools computers: New understanding of entropy

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TechAndComputer (June 1, 2011) — From a laptop warming a knee to a supercomputer heating a room, the idea that computers generate heat is familiar to everyone. But theoretical physicists have discovered something astonishing: not only do computational processes sometimes generate no heat, under certain conditions they can even have a cooling effect. Behind this finding are fundamental considerations relating to knowledge and a lack of knowledge....

TechAndComputer (June 1, 2011) — From a...

Matter-matter entanglement at a distance: Quantum mechanical entanglement of two remote quantum systems

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TechAndComputer (May 27, 2011) — Because of its strange consequences the quantum mechanical phenomenon of entanglement has been called "spooky action at a distance" by Albert Einstein. For several years physicists have been developing concepts how to use this phenomenon for practical applications such as absolutely safe data transmission. For this purpose, the entanglement which is generated in a local process has to be distributed among remote...

TechAndComputer (May 27, 2011) — Because...