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Quantum Computers

News from the world of quantum physics: A non-causal quantum eraser

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This is a long time exposure photography viewing from Tenerife to La Palma. A green laser beam indicates the free-space link between the two laboratories. (Credit: IQOQI Vienna)

Jan. 9, 2013 — Whether a quantum object behaves like a wave or like a particle depends (according to the Copenhagen interpretation) on the choice of measurement apparatus used for observing the system, and therefore on the type of measurement performed.

Anton Zeilinger's team of physicists at the University of Vienna and the Austrian Academy of Sciences has recently taken this phenomenon further than ever. Whether a certain photon behaves like a particle or like a wave depends on the measurement performed on a second photon. In...

New kind of magnetism discovered: Experiments demonstrate ‘quantum spin liquid'

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MIT physicists grew this pure crystal of herbertsmithite in their laboratory. This sample, which took 10 months to grow, is 7 mm long (just over a quarter-inch) and weighs 0.2 grams. (Credit: Tianheng Han)

Dec. 20, 2012 — Following up on earlier theoretical predictions, MIT researchers have now demonstrated experimentally the existence of a fundamentally new kind of magnetic behavior, adding to the two previously known states of magnetism.

Ferromagnetism --...

Fastest light-driven process ever

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TechAndComputer (Dec. 5, 2012) — A discovery that promises transistors -- the fundamental part of all modern electronics -- controlled by laser pulses that will be 10,000 faster than today's fastest transistors has been made by a Georgia State University professor and international researchers.

Professor of Physics Mark Stockman worked with Professor Vadym Apalkov of Georgia State and a group led by Ferenc Krausz at the Max Planck Institute for Quantum Optics and other...

Switching with a few photons for quantum computing

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Electron microscope photo of a cross-section of photonic bandgap fiber. Tiny glass tubes surrounding the core bend light waves in such a way that they interfere and cancel out, focusing all the energy of a beam into the hollow core. (Credit: Gaeta Lab)

TechAndComputer (Dec. 5, 2012) — Quantum computing, where bits of information, or "qubits," are represented by the state of single atomic particles or photons of light, won't be of much use unless we can read the...

Quantum thermodynamics: A better understanding of how atoms soak up their surroundings

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This shows the lattice of laser beams traps small numbers of ytterbium atoms in pancake-shaped "wells." A yellow laser excites the atoms so that they switch between lower (blue) and higher (yellow) energy levels. (Credit: NIST)

TechAndComputer (Dec. 4, 2012) — No man is an island, entire of itself, said poet John Donne. And no atom neither. Even in the middle of intergalactic space, atoms feel the electromagnetic field -- also known as the cosmic microwave background...