Current Quantum Physics News and Events | Page 25

Current Quantum Physics News and Events, Quantum Physics News Articles.
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New instrument extends LIGO's reach
Technology 'squeezes' out quantum noise so more gravitational wave signals can be detected. (2019-12-05)

Fusion by strong lasers
Nuclear physics usually involves high energies, as illustrated by experiments to master controlled nuclear fusion. One problem is how to overcome the strong electrical repulsion between atomic nuclei which requires high energies to make them fuse. But fusion could be initiated at lower energies with electromagnetic fields that are generated by state-of-the-art free electron lasers emitting X-ray light. Researchers at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) describe how this could be done in the journal Physical Review C. (2019-12-05)

A momentous view on the birth of photoelectrons
The creation of photoelectrons through ionisation is one of the most fundamental processes in the interaction between light and matter. Yet, deep questions remain about just how photons transfer their linear momentum to electrons. With the first sub-femtosecond study of the linear photon momentum transfer during an ionisation process, physicists at ETH Zurich provide now unprecedented insight into the birth of photoelectrons. (2019-12-05)

Non-adiabatic dynamics of strongly driven diffusive Josephson junctions
Researchers from the University of Paris-Saclay, the University of Regensburg (Germany) and the University of Jyvaskyla; (Finland) have delivered a combined experimental and theoretical work which reveal the profound nature of quantum transport in strongly driven diffusive Josephson junctions. Results are published in Physical Review Research in October. (2019-12-04)

A platform for stable quantum computing, a playground for exotic physics
Harvard University researchers have demonstrated the first material that can have both strongly correlated electron interactions and topological properties, which not only paves the way for more stable quantum computing but also an entirely new platform to explore the wild world of exotic physics. (2019-12-04)

Bending an organic semiconductor can boost electrical flow
Slightly bending semiconductors made of organic materials can roughly double the speed of electricity flowing through them and could benefit next-generation electronics such as sensors and solar cells, according to Rutgers-led research. The study is published in the journal Advanced Science. (2019-12-03)

Electron correlations in carbon nanostructures
Graphene nanoribbons are only a few carbon atoms wide and have different electrical properties depending on their shape and width. A team from Kiel University has now succeeded in simulating the detailed behavior of electrons in these special nanostructures using an elaborate computational model. (2019-12-03)

Study sheds light on the peculiar 'normal' phase of high-temperature superconductors
Experiments at SLAC and Stanford probe the normal state more accurately than ever before and discover an abrupt shift in the behavior of electrons in which they suddenly give up their individuality and behave like an electron soup. (2019-12-03)

Novel material switches between electrically conducting and insulating states
The new approach developed by Professor James Rondinelli could inform the design of quantum materials platforms for future electronics, as well as faster devices with more storage capabilities. (2019-12-03)

Researchers discover new way to split and sum photons with silicon
A team of researchers at The University of Texas at Austin and the University of California, Riverside have found a way to produce a long-hypothesized phenomenon -- the transfer of energy between silicon and organic, carbon-based molecules -- in a breakthrough that has implications for information storage in quantum computing, solar energy conversion and medical imaging. The research is described in a paper out today in the journal Nature Chemistry. (2019-12-02)

Making higher-energy light to fight cancer
Researchers have achieved photon up-conversion, the emission of light with energy higher than the one that excites the material, using carefully designed structures containing silicon nanocrystals and specialized organic molecules. The accomplishment brings scientists one step closer to developing minimally invasive photodynamic treatments for cancer. The advance could also hasten new technologies for solar-energy conversion, quantum information, and near-infrared driven photocatalysis. (2019-12-02)

The impact of molecular rotation on a peculiar isotope effect on water hydrogen bonds
Quantum nature of hydrogen bonds in water manifests itself in peculiar physicochemical isotope effects: while deuteration often elongates and weakens hydrogen bonds of typical hydrogen-bonded systems composed of bulky constituent molecules, it elongates but strengthens hydrogen bonds of water molecular aggregates. The origin of this unique isotope effect of water molecules remains to be elucidated at the molecular level. A recent experimental study on the sublimation of isotope-mixed water ice has tackled this issue. (2019-12-02)

The coldest reaction
In temperatures millions of times colder than interstellar space, Harvard researchers have performed the coldest reaction in the known universe. But that's not all. In such intense cold, their molecules slowed to such glacial speeds, they could see something no one has been able to see before: the moment when two molecules meet to form two new molecules. In essence, they captured a chemical reaction in its most critical and elusive act. (2019-11-28)

Toward more efficient computing, with magnetic waves
MIT researchers have devised a novel circuit design that enables precise control of computing with magnetic waves -- with no electricity needed. The advance takes a step toward practical magnetic-based devices, which have the potential to compute far more efficiently than electronics. (2019-11-28)

Predicting molecular bond energy by artificial intelligence
Theoretical prediction of molecular bond energy is of key importance for understanding molecular properties. Herein, neural networks are employed to predict the molecular bond energies. In addition, the combination of artificial intelligence and theoretical calculations of quantum chemistry provides an efficient tool for accurately and quickly predicting molecular bond energy. (2019-11-28)

Molecular eraser enables better data storage and computers for AI
Scientists have added a crucial tool to the atomic-scale manufacturing toolkit with major implications for today's data driven -- carbon-intensive -- world, according to new research from the University of Alberta in Canada. (2019-11-27)

Ultrahigh temperature superfluidity made possible in atomic gases via mixed dimensions
Seeking higher transition temperature has been a major theme of superconductivity and superfluidity research. A new study shows that ultrahigh reduced transition temperature, up to Tc/TF ~ 1, has now been made possible in two-component atomic Fermi gases via a tunable pairing interaction strength, using mixed dimensions where one component is in a deep one-dimensional optical lattice with a large lattice spacing, while the other remains in 3D free space. (2019-11-27)

Scientists find new way to identify, manipulate topological metals for spintronics
A recent study gives researchers an easier way of finding Weyl semimetals and manipulating them for potential spintronic devices. (2019-11-27)

Quantum dot lasers move a step closer with electric-pumping development at NTU Singapore
Scientists from Nanyang Technological University, Singapore (NTU Singapore) have developed a way to make Colloidal Quantum Dots produce laser light with the help of an electric field. (2019-11-27)

Ternary acceptor and donor materials increase photon harvesting in organic solar cells
Organic solar cells are steadily improving as new materials are developed for the active layer, and a paper published this week in Applied Physics Reviews presents a practical guide for selecting materials for ternary organic solar cells. The authors set out to employ component engineering to extend the light absorption and efficiency of solar cells in a simple, physical way instead of the complicated process of synthesizing new semiconductors. (2019-11-26)

Theorem explains why quantities such as heat and power can fluctuate in microscopic system
Brazilian researchers participate in theoretical study that could have practical applications in nanoscale machine optimization. (2019-11-26)

Carbon soccer ball with extra proton probably most abundant form in space
It is one of the most common forms of carbon in space: C60, a soccer ball-shaped carbon molecule, but one that has an extra proton attached to it. This is the conclusion of research carried out at Radboud University, which has succeeded for the very first time in measuring the absorption spectrum of this molecule. Such knowledge could ultimately help us to learn more about the formation of planets. (2019-11-25)

Ultrafast quantum simulations: A new twist to an old approach
Billions of tiny interactions occur between thousands of particles in every piece of matter in the blink of an eye. Simulating these interactions in their full dynamics was said to be elusive but has now been made possible by new work of researchers from Oxford and Warwick. (2019-11-25)

Researchers reach milestone in quantum standardization
Researchers at the University of Waterloo have developed a method that could pave the way to establishing universal standards for measuring the performance of quantum computers. The new method, called cycle benchmarking, allows researchers to assess the potential of scalability and to compare one quantum platform against another. (2019-11-25)

Scientists reveal the dominant role of quenched disorder on complex oxide nanowires
At nanometer length scale, novel phenomena are expected to emerge. Compared to the traditional semiconductors used in industrial business, does complex oxides show any interesting and not-before-seen properties at nanometer length scale? A new study published in SCIENCE CHINA Physics, Mechanics & Astronomy has shown the unique physical properties of manganite nanowires known as quenched disorder and its potential applications. (2019-11-22)

New method for using spin waves in magnetic materials
In order to miniaturize individual components of mobile phones or computers, for example, magnetic waves are currently regarded as promising alternatives to conventional data transmission functioning by means of electric currents. The physical basis for this is the spin of electrons in magnetic materials, which can be simplified as a rotation of electrons around their own axis. Physicists at M√ľnster University (Germany) have developed a new approach that makes it easier to use spin waves. (2019-11-22)

A review of single molecule-based electronic devices
In a paper to be published in the forthcoming issue in NANO, a group of researchers from the Shenyang Jianzhu University in China provide an overview of single molecule electronic devices, including molecular electronic devices and electrode types. Future challenges are described in the hopes of attracting more experts from different fields to participate in this research. (2019-11-21)

New twist in quest to develop understanding of time crystalline behavior
The quest to develop the understanding for time crystalline behaviour in quantum systems has taken a new, exciting twist. (2019-11-21)

Princeton scientists discover surprising quantum effect in an exotic superconductor
Superconductors are already in use in various capacities, but newer iron-based superconductors have potential for future use. Researchers led by a Princeton team have studied what happens to the superconducting nature of these materials when impurities are added. The results shed light on how superconductivity behaves in these materials. (2019-11-21)

A super-fast 'light switch' for future cars and computers
Switching light beams quickly is important in many technological applications. Researchers at ETH have now developed an 'electro-opto-mechanical' switch for light beams that is considerably smaller and faster than current models. This is relevant for applications such as self-driving cars and optical quantum technologies. (2019-11-20)

Artyom Yurov, IKBFU physicist: 'Can quantum effects occur at mega-scale?'
Quantum physics is, perhaps, the most amazing phenomenon known to people. When scientists started studying atoms for the first time, they noticed that everything works 'upside down' in the microcosm. (2019-11-20)

Atoms don't like jumping rope
Nanooptical traps are a promising building block for quantum technologies. Austrian and German scientists have now removed an important obstacle to their practical use. They were able to show that a special form of mechanical vibration heats trapped particles in a very short time and knocks them out of the trap. (2019-11-19)

Artificial intelligence algorithm can learn the laws of quantum mechanics
Artificial intelligence can be used to predict molecular wave functions and the electronic properties of molecules. This innovative AI method developed by a team of researchers at the University of Warwick, the Technical University of Berlin and the University of Luxembourg, could be used to speed-up the design of drug molecules or new materials. (2019-11-19)

Discovery in ferroelectric material reveals unique property, application potential
A discovery from a team of physicists and other researchers is breaking new ground in the study of ferroelectricity, a characteristic of certain dielectric materials that are used in high-technology applications. The findings appear today in the journal Nature Materials. (2019-11-18)

Quantum computers learn to mark their own work
A new test to check if a quantum computer is giving correct answers to questions beyond the scope of traditional computing could help the first quantum computer that can outperform a classical computer to be realised. (2019-11-18)

Kick-starting Moore's Law? New 'synthetic' method for making microchips could help
Researchers at Johns Hopkins University have developed a new method for producing atomically-thin semiconducting crystals that could one day enable more powerful and compact electronic devices, according to their paper published today in Nature Nanotechnology. By using specially-treated silicon surfaces to tailor the crystals' size and shape, the researchers have found a potentially faster and less expensive way to produce next-generation semiconductor crystals for microchips. The crystalline materials produced could enable new scientific discoveries (2019-11-18)

Quantum light improves sensitivity of biological measurements
In a new study, researchers showed that quantum light can be used to track enzyme reactions in real time. The work brings together quantum physics and biology in an important step toward the development of quantum sensors for biomedical applications. (2019-11-18)

Blowing bubbles: PPPL scientist confirms way to launch current in fusion plasmas
PPPL physicist Fatima Ebrahimi has used high-resolution computer simulations to investigate the practicality of the CHI start-up technique. The simulations show that CHI could produce the current continuously in larger, more powerful tokamaks than exist today to produce stable fusion plasmas. (2019-11-18)

A one-way street for light
Light can be directed in different directions, usually also back the same way. Physicists from the University of Bonn and the University of Cologne have however succeeded in creating a new one-way street for light. They cool photons down to a Bose-Einstein condensate, which causes the light to collect in optical 'valleys' from which it can no longer return. The findings could also be of interest for the quantum communication of the future. (2019-11-14)

New laser opens up large, underused region of the electromagnetic spectrum
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), in collaboration with MIT and the US Army, have developed a compact, room temperature, widely tunable terahertz laser. (2019-11-14)

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