Current Quantum Mechanics News and Events

Current Quantum Mechanics News and Events, Quantum Mechanics News Articles.
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One-dimensional quantum nanowires fertile ground for Majorana zero modes
One-dimensional quantum 'nanowires' - which have length, but no width or height - provide a unique environment for the formation and detection of a quasiparticle known as a Majorana zero mode, which are their own antimatter particle. A new UNSW advance in detection of these exotic quasiparticles (just published in Nature Communications) has potential applications in fault-resistant topological quantum computers, and topological superconductivity. (2021-01-19)

Alcohols exhibit quantum effects
Skoltech scientists and their colleagues from the Russian Quantum Center revealed a significant role of nuclear quantum effects in the polarization of alcohol in an external electric field. The new research provides insight into the properties of liquid dielectrics. The core assumption of the model pertains to a novel understanding of dielectric polarization phenomena in polar liquids by means of nuclear quantum effects. (2021-01-19)

Light-induced twisting of Weyl nodes switches on giant electron current
Scientists at the U.S. Department of Energy's Ames Laboratory and collaborators at Brookhaven National Laboratory and the University of Alabama at Birmingham have discovered a new light-induced switch that twists the crystal lattice of the material, switching on a giant electron current that appears to be nearly dissipationless. (2021-01-19)

Light-controlled Higgs modes found in superconductors; potential sensor, computing uses
Iowa State University's Jigang Wang and a team of researchers have discovered a short-lived form of the famous Higgs boson -- subject of a groundbreaking search at the Large Hadron Collider -- within an iron-based superconductor. This Higgs mode can be accessed and controlled by laser light flashing on the superconductor at trillions of pulses per second. (2021-01-19)

Increased blood flow during sleep tied to critical brain function
Our brains experience significant changes in blood flow and neural activity during sleep, according to Penn State researchers. Such changes may help to clean out metabolic brain waste that builds up during the day. (2021-01-18)

Rethinking spin chemistry from a quantum perspective
Summary Researchers at Osaka City University use quantum superposition states and Bayesian inference to create a quantum algorithm, easily executable on quantum computers, that accurately and directly calculates energy differences between the electronic ground and excited spin states of molecular systems in polynomial time. (2021-01-18)

Scientists' discovery is paving the way for novel ultrafast quantum computers
Scientists at the Institute of Physics of the University of Tartu have found a way to develop optical quantum computers of a new type. Central to the discovery are rare earth ions that have certain characteristics and can act as quantum bits. These would give quantum computers ultrafast computation speed and better reliability compared to earlier solutions. The University of Tartu researchers Vladimir Hizhnyakov, Vadim Boltrushko, Helle Kaasik and Yurii Orlovskii published the results of their research in the scientific journal Optics Communications. (2021-01-15)

Physicists propose a new theory to explain one dimensional quantum liquids formation
Researchers from the Institute of Cosmos Sciences of the University of Barcelona present a microscopic theory of lattice quantum droplets which explains the formation of a new type of quantum droplets that has been experimentally observed in ultracold atomic systems. (2021-01-15)

Is your skin thirsty? Optoacoustic sensor measures water content in living tissue
Researchers from Skoltech and the University of Texas Medical Branch (US) have shown how optoacoustics can be used for monitoring skin water content, a technique which is promising for medical applications such as tissue trauma management and in cosmetology. (2021-01-15)

USTC makes security analysis and improvement of quantum random number generation
Recently, the research team led by academician GUO Guangcan from the USTC of the Chinese Academy of Sciences has made security analysis and improvement of source independent quantum random number generators with imperfect devices. (2021-01-14)

New way to control electrical charge in 2D materials: Put a flake on it
Gaining control of the flow of electrical current through atomically thin materials is important to potential future applications in photovoltaics or computing. Physicists in Arts & Sciences at Washington University in St. Louis have discovered one way to locally add electrical charge to a graphene device. (2021-01-14)

New state of matter in one-dimensional quantum gas
By adding some magnetic flair to an exotic quantum experiment, physicists produced an ultra-stable one-dimensional quantum gas with never-before-seen ''scar'' states - a feature that could someday be useful for securing quantum information. (2021-01-14)

Quantum computers to study the functioning of the molecules of life
A breakthrough that has implications for molecular biology, pharmacology and nanotechnologies. The fields of application are many. Identifying the mechanisms behind neurodegenerative processes in some proteins, for example, can help limit their proliferation. Understanding how a protein takes on a certain shape can open the way to use the nanomachines that nature has designed to cut, edit or block damaged or defective genes. Their study was published in the international academic journal Physical Review Letters (2021-01-14)

Towards applications: ultra-low-loss on-chip zero-index materials
Dirac-cone materials behave like an isotropic and impedance-matched zero-index medium at Dirac-point wavelength, enabling light-matter interactions in a spatially uniform optical mode with arbitrary shapes. However, such interactions are limited to small areas because of the propagation loss. Scientists designed an ultra-low-loss and homogeneous zero-index material by introducing resonance-trapped bound states in the continuum. This design paves the way for leveraging perfect spatial coherence of large-area zero-index materials in linear, nonlinear, and quantum optics (2021-01-14)

Error protected quantum bits entangled
For the first time, physicists from the University of Innsbruck have entangled two quantum bits distributed over several quantum objects and successfully transmitted their quantum properties. This marks an important milestone in the development of fault-tolerant quantum computers. The researchers published their report in Nature. (2021-01-13)

Scientists modeled protein behavior of archaeal viruses to crack protein folding mystery
Scientists from the Pacific Quantum Center of Far Eastern Federal University (FEFU) figured out how the AFV3-109 protein with slipknot structure folds and unfolds depending on temperature. The protein is typical for the viruses of the oldest single-celled organisms that can survive in the extreme conditions of underwater volcanic sources - archaea. The research outcome appears in PLOS ONE. (2021-01-13)

Pivotal discovery in quantum and classical information processing
Researchers have achieved, for the first time, electronically adjustable interactions between microwaves and a phenomenon in certain magnetic materials called spin waves. This could have application in quantum and classical information processing. (2021-01-13)

Long-range energy transport in perovskite nanocrystal films
High efficiency solar cells and light-emitting devices are end-goal targets towards a more sustainable world. Nanostructures possess distinct advantages due to their exceptional optical and electronic properties under the influence of light. Yet, their wide-spread application in real-world devices is limited by their poor transport properties. Scientists discovered that nanocrystals made with halide perovskites, a recently discovered revolutionary semiconductor, can lead to long-range energy transfer, opening new avenues for future devices implementing disruptive nanotechnologies. (2021-01-12)

Can sodium-ion batteries replace trusty lithium-ion ones?
Sodium-ion batteries are a potential replacement for lithium batteries, but different anodes are needed for the same level of performance. Amorphous carbon is known to be a useful anode, because it has defects and voids that can be used to store sodium ions. Nitrogen/phosphorus-doped carbon also offers appealing electrical properties. In Applied Physics Reviews, researchers describe how they applied basic physical concepts of atomic scale to build high-performance anodes for sodium-ion batteries. (2021-01-12)

Enlightening dark ions
Every field has its underlying principles. For economics it's the rational actor; biology has the theory of evolution; modern geology rests on the bedrock of plate tectonics. (2021-01-12)

Electrically switchable qubit can tune between storage and fast calculation modes
To perform calculations, quantum computers need qubits to act as elementary building blocks that process and store information. Now, physicists have produced a new type of qubit that can be switched from a stable idle mode to a fast calculation mode. The concept would also allow a large number of qubits to be combined into a powerful quantum computer, as researchers from the University of Basel and TU Eindhoven have reported in the journal Nature Nanotechnology. (2021-01-11)

Discovery of quantum behavior in insulators suggests possible new particle
A team led by Princeton physicists discovered a surprising quantum phenomenon in an atomically thin insulator made of tungsten ditelluride. The results suggest the formation of completely new types of quantum phases previously hidden in insulators. (2021-01-11)

Liquid metal ink liberates form
POSTECH-Yonsei University joint research team develops liquid metal ink for 3D circuit lines. (2021-01-10)

Entangling electrons with heat
Quantum entanglement is key for next-generation computing and communications technology, Aalto researchers can now produce it using temperature differences. (2021-01-08)

Researchers realize efficient generation of high-dimensional quantum teleportation
In a study published in Physical Review Letters, the team led by academician GUO Guangcan from University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) made progress in high dimensional quantum teleportation. The researchers demonstrated the teleportation of high-dimensional states in a three-dimensional six-photon system. (2021-01-08)

Researchers question fundamental study on the Kondo effect
In 1998, spectroscopic studies on the Kondo effect using scanning tunnelling microscopy were published, which are considered ground-breaking and have triggered countless others of a similar kind. Many of these studies may have to be re-examined now that researchers from Jülich, Germany have shown that the Kondo effect cannot be proven beyond doubt by this method. Instead, another phenomenon is creating precisely the spectroscopic ''fingerprint'' that was previously attributed to the Kondo effect. (2021-01-07)

A bit too much: reducing the bit width of Ising models for quantum annealing
Quantum annealers are devices that physically implement a quantum system called the 'Ising model' to solve combinatorial optimization problems. However, the coefficients of the Ising model often require a large bit width, making it difficult to implement physically. Now, scientists from Japan demonstrate a method to reduce the bit width of any Ising model, increasing the applicability and versatility of quantum annealers in many fields, including cryptography, logistics, and artificial intelligence. (2021-01-06)

The world's first integrated quantum communication network
Chinese scientists have established the world's first integrated quantum communication network, combining over 700 optical fibers on the ground with two ground-to-satellite links to achieve quantum key distribution over a total distance of 4,600 kilometers for users across the country. (2021-01-06)

Physicists observe competition between magnetic orders
Two-dimensional materials, consisting of a single layer of atoms, have been booming in research for years. They possess novel properties that can only be explained with the help of the laws of quantum mechanics. Researchers have now used ultracold atoms to gain new insights into previously unknown quantum phenomena. They found out that the magnetic orders between two coupled thin films of atoms compete with each other. The study has been published in Nature. (2021-01-06)

Breaking through the resolution barrier with quantum-limited precision
Researchers at Paderborn University have developed a new method of distance measurement for systems such as GPS, which achieves more precise results than ever before. Using quantum physics, the team led by Leibniz Prize winner Professor Christine Silberhorn has successfully overcome the so-called resolution limit. (2021-01-05)

Scientists reach limit of multi-parameter quantum measurement with zero trade-off
Real-life applications like magnetometry or quantum gyroscope typically involve precise measurement on multiple parameters. How to achieve the ultimate precision limits simultaneously is a long sought-after grail in the field. (2021-01-04)

Scrambled supersolids
Supersolids are fluid and solid at the same time. Physicists from Innsbruck and Geneva have for the first time investigated what happens when such a state is brought out of balance. They discovered a soft form of a solid of high interest for science. As the researchers led by Francesca Ferlaino and Thierry Giamarchi report in Nature Physics, they were also able to reverse the process and restore supersolidity. (2021-01-04)

Microfabricated elastic diamonds improve material's electronic properties
Overcoming a key obstacle in achieving diamond-based electronic and optoelectronic devices, researchers have presented a new way to fabricate micrometer-sized diamonds that can elastically stretch. (2020-12-31)

Detective work in theoretical physics
Physicists at the Universities of Münster and Düsseldorf in Germany have published a review article on the so-called dynamical density functional theory (DDFT). This is a method for describing systems consisting of a large number of interacting particles such as are found in liquids, for example. The 127-page article is published in the magazine Advances in Physics. (2020-12-29)

Industry collaboration leads to important milestone in the creation of a quantum computer
One of the obstacles for progress in the quest for a working quantum computer has been that the working devices that go into a quantum computer and perform the actual calculations, the qubits, have hitherto been made by universities and in small numbers. But in recent years, a pan-European collaboration, in partnership with French microelectronics leader CEA-Leti, has been exploring everyday transistors--that are present in billions in all our mobile phones--for their use as qubits. (2020-12-28)

Perfect transmission through barrier using sound
A research team led by Professor Xiang Zhang, President of the University of Hong Kong (HKU) when he was a professor at the University of California, Berkeley, (UC Berkeley) has for the first time experimentally proved a century old quantum theory that relativistic particles can pass through a barrier with 100% transmission. (2020-12-23)

Theory describes quantum phenomenon in nanomaterials
Theoretical physicists Yoshimichi Teratani and Akira Oguri of Osaka City University, and Rui Sakano of the University of Tokyo have developed mathematical formulas that describe a physical phenomenon happening within quantum dots and other nanosized materials. The formulas, published in the journal Physical Review Letters, could be applied to further theoretical research about the physics of quantum dots, ultra-cold atomic gasses, and quarks. (2020-12-23)

Quantum wave in helium dimer filmed for the first time
For the first time, an international team of scientists from Goethe University and the University of Oklahoma has succeeded in filming quantum physical effects on a helium dimer as it breaks apart. The film shows the superposition of matter waves from two simultaneous events that occur with different probability: The survival and the disintegration of the helium dimer. This method might in future make it possible to track experimentally the formation and decay of quantum Efimov systems. (2020-12-23)

Researchers invent method to 'sketch' quantum devices with focused electrons
A technique created by researchers out of the Department of Physics and Astronomy enables them to ''sketch'' patterns of electrons into a programmable quantum material--lanthanum aluminate/strontium titanate or ''LAO/STO''. (2020-12-21)

Optoelectronic devices that emit warm and cool white light
A single semiconducting material can produce white light by emitting light across the visible spectrum. (2020-12-21)

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