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Quantum Computers

World record for entanglement of twisted light quanta

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A long-exposure photo of laser light in 'donut modes' (light beams with no intensity in the middle). (Credit: Robert Fickler, University of Vienna)

TechAndComputer (Nov. 2, 2012) — The Vienna research team led by Anton Zeilinger has achieved a new milestone in the history of quantum physics: The scientists were able to generate and measure the entanglement of the largest quantum numbers to date.

To this end, the researchers developed a new method for entangling single photons which gyrate in opposite directions. This result is a first step towards entangling and twisting even macroscopic, spatially separated objects in two different directions. The researchers at the Vienna Center for Quantum Science...

A new order in the quantum world: Using laser beams scientists generated quantum matter with novel, crystal-like properties

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Illustration of an ordering of five Rydberg-atoms. Green: atoms in the ground state. Red: Rydberg-atoms. Violet: Sphere of influence of the Rydberg-atoms. (Credit: MPQ, Quantum Many-Body Systems Division)

TechAndComputer (Nov. 2, 2012) — By using laser beams MPQ scientists generate quantum matter with novel, crystal-like properties.

Both high-valued diamond and low-prized graphite consist of exactly the same carbon atoms. The subtle but nevertheless...

Particle and wave-like behavior of light measured simultaneously

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Quantum mechanics predicts that photons, particles of light, are both particles and waves simultaneously. Physicists now give a new demonstration of this wave-particle duality of photons. (Credit: © Yahya Idiz / Fotolia)

TechAndComputer (Nov. 1, 2012) — What is light made of: waves or particles? This basic question has fascinated physicists since the early days of science. Quantum mechanics predicts that photons, particles of light, are both particles and waves...

Topological superconductors: Seeking a robust home for qubits

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Researchers have demonstrated for the first time that qubits can successfully exist in a so called topological superconductor material even in the presence of impurities in the material and strong interactions among participating electrons. (Credit: Emily Edwards)

TechAndComputer (Oct. 9, 2012) — If quantum computers are ever going to perform all those expected feats of code-breaking and number crunching, then their component qubits -- tiny ephemeral quantum cells...

Switching cause and effect in quantum world? A causes B causes A

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A new framework for quantum mechanics which does not assume a pre-existing global time. It demonstrates the possibility for two agents to perform a communication task in which it is impossible to tell with certainty who influences whom. (Credit: University of Vienna)

TechAndComputer (Oct. 2, 2012) — One of the most deeply rooted concepts in science and in our everyday life is causality; the idea that events in the present are caused by events in the past and, in...