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Quantum Computers

A hidden order unraveled: Microscopic views on quantum fluctuations

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TechAndComputer (Oct. 14, 2011) — Fluctuations are fundamental to many physical phenomena in our everyday life, such as the phase transitions from a liquid into a gas or from a solid into a liquid. But even at absolute zero temperature, where all motion in the classical world is frozen out, special quantum mechanical fluctuations prevail that can drive the transition between two quantum phases.

Now a team around Immanuel Bloch and Stefan Kuhr at...

TechAndComputer (Oct. 14, 2011) — Fluctuations are fundamental to many physical phenomena in our everyday life, such as the phase transitions from a liquid into a gas or from a solid into a liquid. But even at absolute zero temperature, where all motion in the classical world is frozen...

Quantum teleportation analysed by mathematical separation tool

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TechAndComputer (Sep. 27, 2011) — Scientists from the University of Vienna's Faculty of Physics in Austria recently gave a theoretical description of teleportation phenomena in sub-atomic scale physical systems, in a publication in the European Physical Journal D.

For the first time, the Austrian team has demonstrated that mathematical tools give us the freedom to choose how to separate out the constituting matter of a complex physical system by...

TechAndComputer (Sep. 27, 2011) —...

Like fish on waves, electrons go surfing

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TechAndComputer (Sep. 22, 2011) — Physicists at the RUB, working in collaboration with researchers from Grenoble and Tokyo, have succeeded in taking a decisive step towards the development of more powerful computers. They were able to define two little quantum dots (QDs), occupied with electrons, in a semiconductor and to select a single electron from one of them using a sound wave, and then to transport it to the neighbouring QD.

A single...

TechAndComputer (Sep. 22, 2011) — Physicists...

Searching for spin liquids: Much-sought exotic quantum state of matter can exist

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TechAndComputer (Aug. 12, 2011) — The world economy is becoming ever more reliant on high tech electronics such as computers featuring fingernail-sized microprocessors crammed with billions of transistors. For progress to continue, for Moore's Law -- according to which the number of computer components crammed onto microchips doubles every two years, even as the size and cost of components halves -- to continue, new materials and new phenomena...

TechAndComputer (Aug. 12, 2011) — The world...

Optical circuit enables new approach to quantum technologies

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TechAndComputer (June 24, 2011) — An international research group led by scientists from the University of Bristol, UK, and the Universities of Osaka and Hokkaido, Japan, has demonstrated a fundamental building block for quantum computing that could soon be employed in a range of quantum technologies.

Professor Jeremy O'Brien, Director of the University of Bristol's Centre for Quantum Photonics, and his Japanese colleagues have demonstrated a...

TechAndComputer (June 24, 2011) — An...