Feature Channels: Quantum Mechanics

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Energy is transferred through the structure in a way that boosts its response to light, showing promise for solar cell applications.

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Theorized dark matter particles haven’t yet shown up where scientists had expected them. So Berkeley Lab researchers are now designing new and nimble experiments that can look for dark matter in previously unexplored ranges of particle mass and energy, and using previously untested methods.

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Irvine, Calif., June 6, 2019 – In a paper published this week in Nature, materials science researchers at the University of California, Irvine and other institutions unveil a new process for producing oxide perovskite crystals in exquisitely flexible, free-standing layers. A two-dimensional rendition of this substance is intriguing to scientists and engineers, because 2D materials have been shown to possess remarkable electronic properties, including high-temperature superconductivity.

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Researchers at Rensselaer Polytechnic Institute have come up with a way to manipulate tungsten diselenide (WSe2) —a promising two-dimensional material—to further unlock its potential to enable faster, more efficient computing, and even quantum information processing and storage.

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Proof that a new ability to grow thin films of an important class of materials called complex oxides will, for the first time, make these materials commercially feasible, according to Penn State materials scientists.

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A team led by scientists at Oak Ridge National Laboratory explored how atomically thin two-dimensional (2D) crystals can grow over 3D objects and how the curvature of those objects can stretch and strain the crystals.

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Efforts to create reliable light-based quantum computing, quantum key distribution for cybersecurity, and other technologies got a boost from a new study demonstrating an innovative method for creating thin films to control the emission of single photons.

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The global science and technology organization Battelle recognized materials scientist Mircea Cotlet of Brookhaven Lab's Center for Functional Nanomaterials for his research in applying self-assembly methods to control the interfaces between nanomaterials and other light-interacting components.

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Tweaking the design of microring sensors enhances their sensitivity without adding more implementation complexity.

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The tech world is abuzz about quantum information science (QIS). This emerging technology explores bizarre quantum effects that occur on the smallest scales of matter and could potentially revolutionize the way we live.

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A novel material that consists of a single sheet of carbon atoms could lead to new designs for optical quantum computers. Physicists from the University of Vienna and the Institute of Photonic Sciences in Barcelona have shown that tailored graphene structures enable single photons to interact with each other. The proposed new architecture for quantum computer is published in the recent issue of npj Quantum Information.

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Researchers at the University of Washington, the U.S. Naval Research Laboratory and the Pacific Northwest National Laboratory discovered that they can use extremely high pressure and temperature to introduce other elements into nanodiamonds for applications in bioimaging and quantum computing.

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Physicist Tracy Northup is currently researching the development of quantum internet at the University of Innsbruck.

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Argonne scientists have further explored a new effect that enhances their ability to control the direction of electron spin in certain materials. Their discovery may lead to more powerful and energy-efficient materials for information storage.

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In a paper published in Nature Scientific Reports, APL researchers describe a way to manipulate the critical elements of a quantum computer and their control components that will be an important piece of scaling quantum computer systems to the larger sizes needed for more complex applications.

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Scientists at Brookhaven's Center for Functional Nanomaterials are building a robotic system to accelerate quantum materials discovery.

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A team of researchers led by Berkeley Lab has observed chirality for the first time in polar skyrmions in a material with reversible electrical properties – a combination that could lead to more powerful data storage devices that continue to hold information, even after they’ve been turned off.

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Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. "A particularly promising application is the solution of quantum many-body problems utilizing the concept of digital quantum simulation", says Markus Heyl from Max Planck Institute for the Physics of Complex in Dresden, Germany.

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By drilling holes into a thin two-dimensional sheet of hexagonal boron nitride with a gallium-focused ion beam, University of Oregon scientists have created artificial atoms that generate single photons.

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Gold atoms ski along boron nitride nanotubes and stabilize in metallic monolayers. The resulting gold quantum dots could be a promising material for future electronics and quantum computing.

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Material scientists formulated and tested a new cobalt-based Heusler alloy that can host massless particles, known as Weyl fermions, that can carry charge more efficiently.

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In a collaboration between the U.S. Department of Energy’s Ames Laboratory and Northeastern University, scientists have developed a model for predicting the shape of metal nanocrystals or “islands” sandwiched between or below two-dimensional (2D) materials such as graphene. The advance moves 2D quantum materials a step closer to applications in electronics.

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Irvine, Calif., April 3, 2019 – By focusing light down to the size of an atom, scientists at the University of California, Irvine have produced the first images of a molecule’s normal modes of vibration – the internal motions that drive the chemistry of all things, including the function of living cells. In a study in Nature, researchers at UCI’s Center for Chemistry at the Space-Time Limit describe how they positioned the atomically terminated silver tip of a scanning tunneling microscope mere ängstroms from its target: a cobalt-based porphyrin molecule affixed to a copper platform.

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Scientists have proposed a new method for producing more robust Majorana fermions, a kind of quasiparticle that could act as stable bits of information in next-generation quantum computers.

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Physicists develop new methodWhen a particle is completely isolated from its environment, the laws of quantum physics start to play a crucial role. One important requirement to see quantum effects is to remove all thermal energy from the particle motion, i.e. to cool it as close as possible to absolute zero temperature. Researchers at the University of Vienna, the Austrian Academy of Sciences and the Massachusetts Institute of Technology (MIT) are now one step closer to reaching this goal by demonstrating a new method for cooling levitated nanoparticles.

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An international team of scientists led by the U.S. Department of Energy's (DOE) Argonne National Laboratory explored the concept of reversing time in a first-of-its-kind experiment, managing to return a computer briefly to the past. The results, published March 13 in the journal Scientific Reports, suggest new paths for exploring the backward flow of time in quantum systems and present new possibilities for quantum computer program testing and error correction.

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Researchers from Russia teamed up with colleagues from the U.S. and Switzerland and returned the state of a quantum computer a fraction of a second into the past. They also calculated the probability that an electron in empty interstellar space will spontaneously travel back into its recent past.

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redirect to mitre article 709077

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Review highlights insights into coherence, which could help overcome roadblocks in next-generation energy systems.

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Exploiting a strain-engineering approach could provide nanoscale light sources with a nonfluctuating emission wavelength for use in sensors, quantum communication, and imaging.

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MITRE creates new technology to improve outcomes for our sponsors and deter our adversaries. From financial models to antennae to social media analytics, we drive innovation by delivering 500+ technology licenses and managing 200+ corporate R&D programs and partnerships.

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A new frontier in the study of magnetic materials, femtomagnetism, could lead to ultrafast magnetic storage devices that would transform information processing technologies. Now, researchers report a tabletop method to characterize such a faster magnetic storage using high-harmonic generation of laser light in iron thin films. Their work, which Guoping Zhang will present at the 2019 APS March Meeting, has the same vision as quantum technology.

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Robert Myers, a theoretical physicist consistently ranked among the world’s most influential scientists, has been appointed the new Director of Perimeter Institute. The appointment follows an exhaustive global search and was made with the unanimous approval of a search committee of top international scientists and Perimeter’s Board of Directors.

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In a paper published Feb. 25 in Nature, scientists report that they have developed a system to trap individual excitons — bound pairs of electrons and associated positive charges. This system could form the basis of a novel platform to monitor excitons with precision and develop new quantum technologies.

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An emerging and exciting research field known as quantum information science (QIS) is ramping up in the Computational Science Initiative (CSI) at Brookhaven National Laboratory.

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Rutgers and other physicists have discovered an exotic form of electrons that spin like planets and could lead to advances in lighting, solar cells, lasers and electronic displays. It’s called a “chiral surface exciton,” and it consists of particles and anti-particles bound togeth-er and swirling around each other on the surface of solids, according to a study in the Proceedings of the National Academy of Sciences.

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Scientists from U.S. Department of Energy’s (DOE) national laboratories and a number of top U.S. research universities are proposing to build, within the next decade, an electron ion collider that will provide scientists with one of the best in-depth views of the interior of atomic nuclei.

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Scientists use implanted silicon ions and electricity to increase the spin time of quantum bits, moving closer to the tech needed for quantum networks.

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Particle crowding interferes with moving energy efficiently along promising molecular chains.

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Researchers derived a new set of modified Bell inequalities that apply to cases in which either or both experimenters have only limited freedom to select measurements. They constructed local realist models that mimicked predictions of quantum theory by yielding correlations exceeding Bell’s original inequality.

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Quantum computers are more powerful than classical computers since they work with coherent "quantum bits"; instead of ordinary zeroes and ones. But what if the laws of nature were different from what we think today – could there be even more efficient "science fiction computers"Researchers from the Austrian Academy of Sciences and the University of Vienna have now shown that this is not possible – as long as those machines satisfy the same construction principles as ordinary circuits and their quantum counterparts.

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Researchers at the University of Vienna study the relevance of quantum reference frames for the symmetries of the worldAccording to one of the most fundamental principles in physics, an observer on a moving train uses the same laws to describe a ball on the platform as an observer standing on the platform – physical laws are independent on the choice of a reference frame.

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A careful consideration of electric fields could lead to faster industrial processes that use less energy and release less waste.

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NUS Engineers have developed a cost-effective and scalable strategy for designing tiny semiconductor particles known as transition metal dichalcogenide quantum dots (TMD QDs) which can potentially generate cancer-killing properties.

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Water splitting, the process of harvesting solar energy to generate energy-dense fuels, could be simplified thanks to new research including faculty at Binghamton University, State University of New York.

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A new wave of semiconductors that can be painted on is on the horizon. It bears the promise of revolutionizing lighting all over again and of transforming solar energy. Ornate quantum particle action, revealed here, that drives the new material's properties defies the workings of established semiconductors.

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Intentionally “squashing” colloidal quantum dots during chemical synthesis creates dots capable of stable, “blink-free” light emission that is fully comparable with the light produced by dots made with more complex processes.

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ALBUQUERQUE, N.M. — Quantum computing is a term that periodically flashes across the media sky like heat lightning in the desert: brilliant, attention-getting and then vanishing from the public’s mind with no apparent aftereffects.Yet a multimillion dollar international effort to build quantum computers is hardly going away.

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A weird feature of certain exotic materials allows electrons to travel from one surface of the material to another as if there were nothing in between. Now, researchers have shown that they can switch this feature on and off by toggling a material in and out of a stable topological state with pulses of light. The method could provide a new way of manipulating materials that could be used in future quantum computers and devices that carry electric current with no loss.

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Interferometers—instruments that precisely measure the intersection of two beams of light—are useful for both fundamental science studies and practical applications such as gyroscopes and hydrophones. A team of researchers at ORNL developed and tested a new interferometer that shows potential for improved sensitivity at the quantum scale. Their paper was selected as an APS Editor’s Pick, a distinction reserved for especially noteworthy publications.