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Keyword: quantummechanics

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  • Artificial intelligence reduces a 100,000-equation quantum physics problem to only four equations

    09/26/2022 3:05:10 PM PDT · by BenLurkin · 43 replies ^ | SEPTEMBER 26, 2022 | Thomas Sumner,
    For even a modest number of electrons and cutting-edge computational approaches, the problem requires serious computing power. That's because when electrons interact, their fates can become quantum mechanically entangled: Even once they're far apart on different lattice sites, the two electrons can't be treated individually, so physicists must deal with all the electrons at once rather than one at a time. With more electrons, more entanglements crop up, making the computational challenge exponentially harder. One way of studying a quantum system is by using what's called a renormalization group. That's a mathematical apparatus physicists use to look at how the...
  • Strange new phase of matter created in quantum computer acts like it has two time dimensions [sort of]

    07/21/2022 9:30:48 AM PDT · by BenLurkin · 21 replies ^ | JULY 20, 2022 | Simons Foundation
    By shining a laser pulse sequence inspired by the Fibonacci numbers at atoms inside a quantum computer, physicists have created a remarkable, never-before-seen phase of matter. The phase has the benefits of two time dimensions despite there still being only one singular flow of time... This mind-bending property offers a sought-after benefit: Information stored in the phase is far more protected against errors than with alternative setups currently used in quantum computers. As a result, the information can exist without getting garbled for much longer, an important milestone for making quantum computing viable, says study lead author Philipp Dumitrescu. The...
  • Record-setting quantum entanglement connects two atoms across 20 miles

    07/08/2022 7:44:47 AM PDT · by Red Badger · 42 replies ^ | JULY 7, 2022 | By Michael Irving
    Researchers in Germany have demonstrated quantum entanglement of two atoms separated by 33 km (20.5 miles) of fiber optics. This is a record distance for this kind of communication and marks a breakthrough towards a fast and secure quantum internet. Quantum entanglement is the uncanny phenomenon where two particles can become so inextricably linked that examining one can tell you about the state of the other. Stranger still, changing something about one particle will instantly alter its partner, no matter how far apart they are. That leads to the unsettling implication that information is being “teleported” faster than the speed...
  • Electrons take the fast and slow lanes at the same time

    06/19/2022 12:41:54 PM PDT · by BenLurkin · 10 replies ^ | JUNE 17, 2022 | University of Cambridge
    It has long been known that there are two types of excitation for electrons, as in addition to their charge they have a property called spin. Spin and charge excitations travel at fixed, but different speeds...However, theorists are unable to calculate what precisely happens beyond only small perturbations, as the interactions are too complex. The Cambridge team has measured these speeds as their energies are varied, and find that a very simple picture emerges...Each type of excitation can have low or high kinetic energy... with the well-known formula E=1/2 mv2, which is a parabola. But for spin and charge the...
  • Two teams use neutral atoms to create quantum circuits

    04/22/2022 11:11:21 AM PDT · by nickcarraway · 11 replies ^ | APRIL 22, 2022 | Bob Yirka
    Two teams of researchers working independently have shown the viability of using neutral atoms to create quantum circuits—both have published outlines of their work in the journal Nature. One of the groups, with members from the University of Wisconsin, Madison, ColdQuanta and Riverlane, successfully ran an algorithm on a cold atom quantum computer for the first time. The second group, with members from Harvard, MIT, QuEra Computing Inc., the University of Innsbruck and the Austrian Academy of Sciences, showed that it was possible to build a quantum processor based on coherent transport of entangled atom arrays. Hannah Williams, with Durham...
  • An Ancient Namibian Stone Could Hold The Key to Unlocking Quantum Computers

    04/20/2022 6:16:13 AM PDT · by Red Badger · 50 replies ^ | April 19, 2022 | DAVID NIELD
    Cuprous oxide crystal. (University of St Andrews) One of the ways we can fully realize the potential of quantum computers is by basing them on both light and matter – this way, information can be stored and processed, but also travel at the speed of light. Scientists have just taken a step closer to this goal, by successfully producing the largest hybrid particles of light and matter ever created. These quasiparticles, known as Rydberg polaritons, were made with the help of a piece of stone containing cuprous oxide (Cu2O) crystals from an ancient deposit in Namibia, one of the few...
  • Physicists Discover “Secret Sauce” Behind Unusual Exotic Properties of New Quantum Material

    01/18/2022 8:16:00 AM PST · by Red Badger · 44 replies ^ | JANUARY 18, 2022 | By ELIZABETH A. THOMSON, MIT MATERIALS RESEARCH LABORATORY
    A visualization of the zero-energy electronic states – also known as a ‘Fermi surface’ – from the kagome material studied by MIT’s Riccardo Comin and colleagues. Credit: Comin Laboratory, MIT ************************************************************************** Work will aid design of other unusual quantum materials with many potential applications. MIT physicists and colleagues have discovered the “secret sauce” behind some of the exotic properties of a new quantum material that has transfixed physicists due to those properties, which include superconductivity. Although theorists had predicted the reason for the unusual properties of the material, known as a kagome metal, this is the first time that the...
  • Proof of concept verifies physics that could enable quantum batteries

    01/17/2022 9:01:29 AM PST · by Red Badger · 14 replies ^ | January 16, 2022 | By Michael Irving & University of Adelaide via Scimex
    Quantum batteries could one day revolutionize energy storage through what seems like a paradox – the bigger the battery, the faster it charges. For the first time, a team of scientists has now demonstrated the quantum mechanical principle of superabsorption that underpins quantum batteries in a proof-of-concept device. The quirky world of quantum physics is full of phenomena that seem impossible to us. Molecules, for instance, can be become so entwined that they begin acting collectively, and this can lead to a range of quantum effects. That includes superabsorption, which boosts a molecule’s ability to absorb light. “Superabsorption is a...
  • Newly Discovered Type of “Strange Metal” – Material That Shares Fundamental Quantum Attributes With Black Holes

    01/16/2022 7:30:37 PM PST · by BraveMan · 32 replies
    SciTechDaily ^ | JANUARY 16, 2022 | BROWN UNIVERSITY
    A new discovery could help scientists to understand “strange metals,” a class of materials that are related to high-temperature superconductors and share fundamental quantum attributes with black holes. Scientists understand quite well how temperature affects electrical conductance in most everyday metals like copper or silver. But in recent years, researchers have turned their attention to a class of materials that do not seem to follow the traditional electrical rules. Understanding these so-called “strange metals” could provide fundamental insights into the quantum world, and potentially help scientists understand strange phenomena like high-temperature superconductivity. Now, a research team co-led by a Brown...
  • Spooky Quantum Effect That Turns Matter Invisible Finally Demonstrated author logo

    11/23/2021 9:18:51 AM PST · by Red Badger · 25 replies ^ | BEN TURNER, | 22 NOVEMBER 2021
    A weird quantum effect that was predicted decades ago has finally been demonstrated – if you make a cloud of gas cold and dense enough, you can make it invisible. Scientists at the Massachusetts Institute of Technology (MIT) used lasers to squeeze and cool lithium gas to densities and temperatures low enough that it scattered less light. If they can cool the cloud even closer to absolute zero (minus 459.67 degrees Fahrenheit, or minus 273.15 degrees Celsius), they say it will become completely invisible. The bizarre effect is the first ever specific example of a quantum mechanical process called Pauli...
  • Quantum Cheshire cats could have a travelling grin

    10/28/2021 7:43:37 PM PDT · by LibWhacker · 17 replies
    Physics World ^ | 10/27/2021 | Ieva Čepaitė
    Grinning away: The quantum Cheshire cat effect takes its name from a character in Lewis Carroll's novel Alice’s Adventures in Wonderland. (Courtesy: Larissa Kulik/Shutterstock) Since its inception, quantum theory has presented us with many strange and seemingly paradoxical phenomena. One of the oddest examples is the quantum Cheshire cat effect, in which properties of quantum objects become disembodied from the objects themselves. Now, two of the researchers who predicted the effect have shown that it is even weirder than they first thought: not only can quantum properties become detached from their parent objects, these properties can also move of...
  • Physics Experiment Reveals Formation of a New State of Matter – Breaks Time-Reversal Symmetry

    10/19/2021 12:09:53 PM PDT · by Red Badger · 50 replies ^ | OCTOBER 19, 2021 | By KTH, ROYAL INSTITUTE OF TECHNOLOGY
    The central principle of superconductivity is that electrons form pairs. But can they also condense into foursomes? Recent findings have suggested they can, and a physicist at KTH Royal Institute of Technology today published the first experimental evidence of this quadrupling effect and the mechanism by which this state of matter occurs. Reporting in Nature Physics, Professor Egor Babaev and collaborators presented evidence of fermion quadrupling in a series of experimental measurements on the iron-based material, Ba1−xKxFe2As2. The results follow nearly 20 years after Babaev first predicted this kind of phenomenon, and eight years after he published a paper predicting...
  • Astronomy Picture of the Day - The Holographic Principle and a Teapot

    10/03/2021 3:18:19 PM PDT · by MtnClimber · 32 replies ^ | 3 Oct, 2021 | Image Credit: Caltech
    Explanation: Sure, you can see the 2D rectangle of colors, but can you see deeper? Counting color patches in the featured image, you might estimate that the most information that this 2D digital image can hold is about 60 (horizontal) x 50(vertical) x 256 (possible colors) = 768,000 bits. However, the yet-unproven Holographic Principle states that, counter-intuitively, the information in a 2D panel can include all of the information in a 3D room that can be enclosed by the panel. The principle derives from the idea that the Planck length, the length scale where quantum mechanics begins to dominate classical...
  • Scientists Demonstrate Optomechanical Quantum Teleportation

    10/15/2021 6:32:51 PM PDT · by Roman_War_Criminal · 30 replies
    sci-news ^ | 10/14/21 | staff
    Quantum teleportation of an unknown input state from an outside source onto a quantum node is considered one of the key components of long-distance quantum communication protocols. It has already been demonstrated with pure photonic quantum systems as well as atomic and solid-state spin systems linked by photonic channels. Now, a team of researchers from the Netherlands, Brazil and China has demonstrated quantum teleportation of a polarization-encoded optical input state onto the joint state of a pair of nanomechanical resonators. “The use of optomechanical devices is a breakthrough because they can be designed to operate at any optical wavelength, including...
  • Wave–particle duality quantified for the first time

    09/18/2021 9:44:43 AM PDT · by LibWhacker · 30 replies
    Physics World ^ | 9/1/2021 | Karmela Padavic-Callaghan
    Quantum mechanicsResearch updateWave–particle duality quantified for the first time 01 Sep 2021 Complementarity A new twist on the double-slit experiment. (Courtesy: Shutterstock/Andrey VP) One of the most counterintuitive concepts in physics – the idea that quantum objects are complementary, behaving like waves in some situations and like particles in others – just got a new and more quantitative foundation. In a twist on the classic double-slit experiment, scientists at Korea’s Institute for Basic Sciences (IBS) used precisely controlled photon sources to measure a photon’s degree of wave-ness and particle-ness. Their results, published in Science Advances, show that the properties of...
  • Quantum Crystal With “Time Reversal” Could Be a New Dark Matter Sensor

    08/05/2021 12:30:47 PM PDT · by Red Badger · 35 replies ^ | AUGUST 5, 2021 | By NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)
    Physicists at the National Institute of Standards and Technology (NIST) have linked together, or “entangled,” the mechanical motion and electronic properties of a tiny blue crystal, giving it a quantum edge in measuring electric fields with record sensitivity that may enhance understanding of the universe. The quantum sensor consists of 150 beryllium ions (electrically charged atoms) confined in a magnetic field, so they self-arrange into a flat 2D crystal just 200 millionths of a meter in diameter. Quantum sensors such as this have the potential to detect signals from dark matter — a mysterious substance that might turn out to...
  • In a first, scientists capture a 'quantum tug' between neighboring water molecules

    08/29/2021 8:40:58 PM PDT · by SunkenCiv · 14 replies
    Phys dot org ^ | August 25, 2021 | SLAC National Accelerator Laboratory
    Water is the most abundant yet least understood liquid in nature. It exhibits many strange behaviors that scientists still struggle to explain. While most liquids get denser as they get colder, water is most dense at 39 degrees Fahrenheit, just above its freezing point. This is why ice floats to the top of a drinking glass and lakes freeze from the surface down, allowing marine life to survive cold winters. Water also has an unusually high surface tension, allowing insects to walk on its surface, and a large capacity to store heat, keeping ocean temperatures stable.Now, a team that includes...
  • Why Don't Black Holes Swallow All of Space? This Explanation Is Blowing Our Minds

    08/16/2021 11:38:08 AM PDT · by Red Badger · 36 replies ^ | Aug 16, 2021 | MIKE MCRAE
    Black holes are great at sucking up matter. So great, in fact, that not even light can escape their grasp (hence the name). But given their talent for consumption, why don't black holes just keep expanding and expanding and simply swallow the Universe? In 2018, one of the world's top physicists came up with a dazzling explanation. Conveniently, the idea could also unite the two biggest theories in all of physics. The researcher behind this explanation is none other than Stanford University physicist Leonard Susskind, also known as one of the fathers of string theory. He gave his two cents...
  • An integrated circuit of pure magnons

    10/22/2020 7:41:23 AM PDT · by Red Badger · 21 replies ^ | October 20, 2020 | by University of Vienna
    The directional coupler with a visible atomic structure is depicted. Spin wave jumps from one nanowire conduit to another nanowire at the point where the conduits are getting closer one to another. Credit: Niels Paul Bethe =========================================================================== Researchers led by Technische Universität Kaiserslautern (TUK) and the University of Vienna successfully constructed a basic building block of computer circuits using magnons to convey information, in place of electrons. The 'magnonic half-adder' described in Nature Electronics, requires just three nanowires, and far less energy than the latest computer chips. A team of physicists are marking a milestone in the quest for smaller...
  • Timekeeping theory combines quantum clocks and Einstein's relativity

    10/23/2020 10:14:00 AM PDT · by BenLurkin · 34 replies ^ | 10/23/2020 | Dartmouth College
    A phenomenon of quantum mechanics known as superposition can impact timekeeping in high-precision clocks, according to a theoretical study from Dartmouth College, Saint Anselm College and Santa Clara University. Research describing the effect shows that superposition—the ability of an atom to exist in more than one state at the same time—leads to a correction in atomic clocks known as "quantum time dilation." The research, published in the journal Nature Communications, takes into account quantum effects beyond Albert Einstein's theory of relativity to make a new prediction about the nature of time. In the early 1900s, Albert Einstein presented a revolutionary...