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Australian scientists have created the world’s first-ever quantum computer circuit – one that contains all the essential components found on a classical computer chip but at the quantum scale.

The landmark discovery, published in Nature today, was nine years in the making.

“This is the most exciting discovery of my career,” senior author and quantum physicist Michelle Simmons, founder of Silicon Quantum Computing and director of the Center of Excellence for Quantum Computation and Communication Technology at UNSW told ScienceAlert.

Continue reading “A Huge Step Forward in Quantum Computing Was Just Announced: The First-Ever Quantum Circuit” »

James Vary has been waiting for nuclear physics experiments to confirm the reality of a “tetraneutron” that he and his colleagues theorized, predicted and first announced during a presentation in the summer of 2014, followed by a research paper in the fall of 2016.

“Whenever we present a theory, we always have to say we’re waiting for experimental confirmation,” said Vary, an Iowa State University professor of physics and astronomy.

In the case of four neutrons (very, very) briefly bound together in a temporary quantum state or resonance, that day for Vary and an international team of theorists is now here.

Flashes of what may become a transformative new technology are coursing through a network of optic fibers under Chicago.

Researchers have created one of the world’s largest networks for sharing quantum information —a field of science that depends on paradoxes so strange that Albert Einstein didn’t believe them.

The network, which connects the University of Chicago with Argonne National Laboratory in Lemont, is a rudimentary version of what scientists hope someday to become the internet of the future. For now, it’s opened up to businesses and researchers to test fundamentals of quantum information sharing.

For a few years now, spent grain, the cereal residue from breweries, has been reused in animal feed. This material could also be used in nanotechnology. Professor Federico Rosei’s team at the Institut national de la recherche scientifique (INRS) has shown that microbrewery waste can be used as a carbon source to synthesize quantum dots. The work, done in collaboration with Claudiane Ouellet-Plamondon of the École de technologie supérieure (ÉTS), was published in the Royal Society of Chemistry’s journal RSC Advances.

Often considered “artificial atoms,” quantum dots are used in the transmission of light. With a range of interesting physicochemical properties, this type of nanotechnology has been successfully used as a sensor in biomedicine or as LEDs in next generation displays. But there is a drawback. Current quantum dots are produced with heavy and toxic metals like cadmium. Carbon is an interesting alternative, both for its biocompatibility and its accessibility.

Quantum computers are one of the key future technologies of the 21^st century. Researchers at Paderborn University, working under Professor Thomas Zentgraf and in cooperation with colleagues from the Australian National University and Singapore University of Technology and Design, have developed a new technology for manipulating light that can be used as a basis for future optical quantum computers. The results have now been published in Nature Photonics.

New optical elements for manipulating light will allow for more advanced applications in modern information technology, particularly in quantum computers. However, a major challenge that remains is non-reciprocal light propagation through nanostructured surfaces, where these surfaces have been manipulated at a tiny scale.

Professor Thomas Zentgraf, head of the working group for ultrafast nanophotonics at Paderborn University, explains that “in reciprocal propagation, light can take the same path forward and backward through a structure; however, non-reciprocal propagation is comparable to a one-way street where it can only spread out in one direction.”

Inside NASA’s Cold Atom Lab, scientists form bubbles from ultracold gas, shown in pink in this illustration. Lasers, also depicted, are used to cool the atoms, while an atom chip, illustrated in gray, generates magnetic fields to manipulate their shape, in combination with radio waves.

Credit: NASA/JPL-Caltech

Continue reading “Ultracold Bubbles on Space Station Open New Avenues of Quantum Research” »

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Physicists have long sought to marry general relativity and quantum mechanics – now some reckon experiments that probe the way each theory treats time could finally make it happen.

Continue reading “Will we ever unite physics? Clocks in superposition could offer clues” »

Quantum theory has weird implications. Trying to explain them just makes things weirder.

Manufacturing with atoms has been the siren’s call for many researchers who believed it was the key that could unlock enormous new potential in how we build things. We could develop products that are perfectly precise, contain zero waste and that are 1000x more energy efficient. The problem has always been the same: How? Until now. Wolkow has taken a leading role in laying a new, stable foundation for the world to begin building on the tiniest of scales. Robert Wolkow is a Professor in the Department of Physics, iCORE Chair of Nanoscale Information and Communications Technology at the University of Alberta and Fellow of the Royal Society of Canada. He is also the Principal Research Officer and Nanoelectronics Program Coordinator at the NRC Nanotechnology Research Centre (NRC-NANO), AITF Industrial Chair in Atom Scale Fabrication and CTO of Quantum Silicon Inc.

An award-winning innovator, Wolkow has had a leading role in discovering, altering and deploying atom scale properties of silicon. His years of fundamental advances have laid a broad foundation for practical applications. This talk was given at a TEDx event using the TED conference format but independently organized by a local community.