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Keyword: quantummechanics

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  • Physicists Have Figured Out a Way to Measure Gravity on a Quantum Scale

    02/23/2024 10:11:52 PM PST · by Red Badger · 10 replies
    Science Alert ^ | 24 February 2024 | MICHELLE STARR
    An artist's impression of the experiment. (University of Southampton) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Acting on a tiny particle levitating in a magnetic trap, physicists have just measured the smallest gravitational pull ever recorded. The particle weighed just 0.43 grams. And the strength of the gravitational force at play was on the scale of attonewtons (10-18 newtons). That's small enough to be right on the verge of the quantum realm, teasing the possibility of finally figuring out how classical physics and quantum mechanics interact. "For a century, scientists have tried and failed to understand how gravity and quantum mechanics work together," says physicist Tim...
  • Pioneering Quantum Physicists Win Nobel Prize in Physics

    10/26/2022 9:51:39 PM PDT · by NoLibZone · 14 replies
    Quantum magazine ^ | Oct 4,2022 | Charles Wood
    Alain Aspect, John Clauser and Anton Zeilinger have won the 2022 Nobel Prize in Physics for groundbreaking experiments with entangled particles. The physicists Alain Aspect, John Clauser and Anton Zeilinger have won the 2022 Nobel Prize in Physics for experiments that proved the profoundly strange quantum nature of reality. Their experiments collectively established the existence of a bizarre quantum phenomenon known as entanglement, where two widely separated particles appear to share information despite having no conceivable way of communicating. Entanglement lay at the heart of a fiery clash in the 1930s between physics titans Albert Einstein on the one hand...
  • Squeezing the Universe: LIGO Breaks the Quantum Limit

    11/10/2023 12:37:42 PM PST · by Red Badger · 8 replies
    Scitech Daily ^ | NOVEMBER 10, 2023 | By WHITNEY CLAVIN, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    The Laser Interferometer Gravitational-Wave Observatory (LIGO) has improved its detection of cosmic events by overcoming quantum noise through advanced “squeezing” technology. This breakthrough will increase its detection rate by 60 percent and pave the way for advancements in quantum technology and physics. Researchers using LIGO achieved a landmark in quantum squeezing. In 2015, the Laser Interferometer Gravitational-Wave Observatory, or LIGO, made history when it made the first direct detection of gravitational waves, or ripples in space and time, produced by a pair of colliding black holes. Since then, the U.S. National Science Foundation (NSF)-funded LIGO and its sister detector in...
  • Unveiling the Quantum World: Scientists Capture Quantum Entanglement of Photons in Real-Time

    09/29/2023 9:28:53 AM PDT · by Red Badger · 21 replies
    Scitech Daily ^ | SEPTEMBER 29, 2023 | By UNIVERSITY OF OTTAWA
    Researchers have pioneered a technique for swiftly and efficiently reconstructing the full quantum state of entangled particles, utilizing advanced camera technology to visualize the wave function of two entangled photons in real time. The innovative method is exponentially faster than previous ones, taking minutes or seconds instead of days, and holds the potential for advancing quantum technology by enhancing quantum state characterization, quantum communication, and quantum imaging techniques. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A new technique based on advanced camera technology demonstrates a rapid and efficient way to reconstruct the full quantum state of entangled particles. Researchers from the University of Ottawa, working together...
  • Physicists Conduct The Most Massive Test Ever of The Einstein-Podolsky-Rosen Paradox

    06/13/2023 7:53:46 AM PDT · by SunkenCiv · 32 replies
    Science Alert ^ | June 12, 2023 | Michelle Starr
    In the most massive test to date, physicists have probed a major paradox in quantum mechanics and found it still holds even for clouds of hundreds of atoms.Using two entangled Bose-Einstein condensates, each consisting of 700 atoms, a team of physicists co-led by Paolo Colciaghi and Yifan Li of the University of Basel in Switzerland has shown that the Einstein-Podolsky-Rosen (EPR) paradox scales up.The researchers say this has important implications for quantum metrology – the study of measuring things under quantum theory...One of the tools we use to close one of the gaps is quantum mechanics, a theory that arose...
  • Quantum physics proposes a new way to study biology – and the results could revolutionize our understanding of how life works

    05/20/2023 12:58:27 PM PDT · by zeestephen · 31 replies
    TheConversation.com ^ | 15 May 2023 | Clarice D. Aiello
    Over the past few decades, scientists have made incredible progress in understanding and manipulating biological systems at increasingly small scales, from protein folding to genetic engineering. And yet, the extent to which quantum effects influence living systems remains barely understood...Quantum effects are phenomena that occur between atoms and molecules that can't be explained by classical physics...Instead, tiny objects behave according to a different set of laws known as quantum mechanics.
  • Quantum Experiment Shows How Einstein Was Wrong About One Thing

    05/15/2023 11:26:48 AM PDT · by Red Badger · 50 replies
    Science Alert ^ | 16 May 2023 | ByDAVID NIELD
    Quantum machine - Inside the 30-meter tube. (ETH Zurich/Daniel Winkler) Albert Einstein wasn't entirely convinced about quantum mechanics, suggesting our understanding of it was incomplete. In particular, Einstein took issue with entanglement, the notion that a particle could be affected by another particle that wasn't close by. Experiments since have shown that quantum entanglement is indeed possible and that two entangled particles can be connected over a distance. Now a new experiment further confirms it, and in a way we haven't seen before. In the new experiment, scientists used a 30-meter-long tube cooled to close to absolute zero to run...
  • "We have made science fiction come true!" Scientists prove particles in a quantum system can be rejuvenated

    02/22/2023 2:19:46 PM PST · by zeestephen · 16 replies
    El Pais USA (via MSN.com) ^ | 21 February 2023 | Raúl Limón
    Imagine you are 40-something and want to go on a date looking like you did 20 years ago. This is impossible in the classical physical world but not in the quantum world, which refers to the subatomic particles that are the foundation for all reality...The team published papers in Physical Review X, Quantum, Arxiv, Physical Review Letters and Optica on theoretical research and experiments proving it's possible to "accelerate, decelerate and reverse the flow of time within arbitrary, even uncontrolled quantum systems."
  • Researchers achieve the first observation of de Broglie-Mackinnon wave packets by exploiting loophole in 1980’s-era laser physics theorem

    01/27/2023 12:43:58 PM PST · by aimhigh · 16 replies
    EurekaAlert ^ | 01/27/2023 | UNIVERSITY OF CENTRAL FLORIDA
    University of Central Florida College of Optics and Photonics researchers achieved the first observation of de Broglie-Mackinnon wave packets by exploiting a loophole in 1980’s-era laser physics theorem. A research paper by CREOL and Florida Photonics Center of Excellence professor Ayman Abouraddy and research assistant Layton Hall ’22MS has been published in the peer-reviewed scientific journal, Nature Physics. Observation of optical de Broglie–Mackinnon wave packets highlights the team’s research using a class of pulsed laser beams they call space-time wave packets. In an interview with Dr. Abouraddy, he provides more insight into his team’s research and what it may hold...
  • DEEP UNDERGROUND LABORATORY REVEALS RESULTS OF HUNT FOR QUANTUM GRAVITY, STRING THEORY

    01/12/2023 8:17:09 AM PST · by BenLurkin · 16 replies
    The Debrief ^ | 01/01/2023 | Christopher Plain
    For decades physicists have tried to rectify the Standard Model of Particle Physics, which is great at describing the behavior of particles, interactions, and quantum processes on the micro scale, with gravity...the Standard Model, as it is currently constructed, fails to account for gravity at this extremely small scale. ...a number of mathematical models have been proposed that would unify these disparate phenomena, including something called string theory [and] a number of these models feature elements that can be tested in a lab setting. One is known as the Pauli exclusion principle. Pauli exclusion basically means that no two electrons...
  • Don't Let Yourself Get Tangled Up by These 4 Quantum Mechanics Misconceptions

    11/10/2022 6:54:36 PM PST · by BenLurkin · 33 replies
    sciencealert.com ^ | ALESSANDRO FEDRIZZI & MEHUL MALIK,
    1. A cat can be dead and alive Obviously, a cat is nothing like an individual photon in a controlled lab environment, it is much bigger and more complex. Any coherence that the trillions upon trillions of atoms that make up the cat might have with each other is extremely short-lived. This does not mean that quantum coherence is impossible in biological systems, just that it generally won't apply to big creatures such as cats or a human. 2. Simple analogies can explain entanglement Quantum particles are just mysteriously correlated in ways we can't describe with everyday logic or language...
  • Scientists discover exotic quantum state at room temperature

    11/01/2022 12:52:32 PM PDT · by Red Badger · 12 replies
    https://phy.princeton.edu ^ | Oct. 26, 2022 | By Tom Garlinghouse
    Scientists discover exotic quantum state at room temperature An illustration depicting a topological insulator in action. - Shafayat Hossain and M. Zahid Hasan of Princeton University For the first time, physicists have observed novel quantum effects in a topological insulator at room temperature. Researchers at Princeton found that a material known as a topological insulator, made from the elements bismuth and bromine, exhibit specialized quantum behaviors normally seen only under extreme experimental conditions of high pressures and temperatures near absolute zero. The finding opens up a new range of possibilities for the development of efficient quantum technologies, such as spin-based,...
  • The Universe as We Understand It May Be Impossible

    10/27/2022 1:59:46 PM PDT · by nickcarraway · 99 replies
    The Atlantic ^ | Natalie Wolchover and Quanta Magazine
    A new conjecture in physics challenges the leading “theory of everything.”On June 25, Timm Wrase awoke in Vienna and groggily scrolled through an online repository of newly posted physics papers. One title startled him into full consciousness. The paper, by the prominent string theorist Cumrun Vafa of Harvard and his collaborators, conjectured a simple formula dictating which kinds of universes are allowed to exist and which are forbidden, according to string theory. The leading candidate for a “theory of everything” weaving the force of gravity together with quantum physics, string theory defines all matter and forces as vibrations of tiny...
  • Entanglement-Enhanced Matter-Wave Interferometer: Now With Double the Spookiness!

    10/26/2022 12:56:46 PM PDT · by Red Badger · 35 replies
    Scitech Daily ^ | OCTOBER 24, 2022 | By KENNA HUGHES-CASTLEBERRY, JILA
    A rendering of the entangled atoms within the interferometer. Credit: Steven Burrows, Thompson Group/JILA A team of researchers at JILA has for the first time successfully combined two of the “spookiest” features of quantum mechanics to make a better quantum sensor: entanglement between atoms and delocalization of atoms. JILA is a physical science research institute operated by the National Institute of Standards and Technology (NIST) and the University of Colorado Boulder. For the first time, scientists have successfully combined two of the “spookiest” features of quantum mechanics to make a better quantum sensor: entanglement between atoms and delocalization of atoms....
  • 'Spooky action at a distance' can lead to a multiverse. Here's how.

    10/23/2022 8:07:06 AM PDT · by BenLurkin · 36 replies
    Space.com ^ | Paul Sutter
    One of the earliest realizations in the history of quantum mechanics is that matter has a wave-like property. Other physicists soon confirmed ...electrons scattered off a thin foil before landing on a target. The way the electrons scattered was more characteristic of a wave than a particle. What, exactly, is a wave of matter? Schrödinger...developed his famous equation to describe the behavior of those waves... But Schrödinger's idea flew in the face of more experimental tests. For example, even though an electron acted like a wave midflight, when it reached a target, it landed as a single, compact particle, so...
  • The coherent simulation of a quantum phase transition in a programmable 2,000 qubit Ising chain

    10/11/2022 3:22:50 PM PDT · by BenLurkin · 28 replies
    , Phys.org ^ | Ingrid Fadelli
    Quantum computers have the potential to outperform classical computers on several complex tasks, yet many challenges will need to be overcome before they reach their full potential. In the meantime, physicists and computer scientists have been trying to realistically estimate the capabilities that quantum computing technologies will exhibit in the near future. Quantum simulations—realizations of quantum systems manifested using programmable simulation devices—have proved particularly valuable for determining the near-term potential of quantum computers. One approach that can be investigated using quantum simulations is quantum annealing, an optimization process based on engineered quantum fluctuations. The quantum simulation of the 1D Ising...
  • The Universe Is Not Locally Real, and the Physics Nobel Prize Winners Proved It

    10/08/2022 11:31:43 AM PDT · by Cronos · 94 replies
    Scientific American ^ | 6th oct2022 | Daniel Garisto
    One of the more unsettling discoveries in the past half century is that the universe is not locally real. “Real,” meaning that objects have definite properties independent of observation—an apple can be red even when no one is looking; “local” means objects can only be influenced by their surroundings, and any influence cannot travel faster than light. Investigation shows objects are not influenced solely by surroundings and may also lack definite properties prior2 measurement ...pairs of particles are sent off in different directions from a common source, targeted for two observers, Alice and Bob, each stationed at opposite ends of...
  • Three scientists share Nobel Prize in Physics for work in quantum mechanics

    10/04/2022 4:28:19 AM PDT · by FarCenter · 33 replies
    Three scientists jointly won this year's Nobel Prize in physics on Tuesday for their work on quantum information science that has significant applications, for example in the field of encryption. Alain Aspect, John F. Clauser and Anton Zeilinger were cited by the Royal Swedish Academy of Sciences for discovering the way that particles known as photons can be linked, or "entangled," with each other even when they are separated by large distances. "Quantum information science is a vibrant and rapidly developing field," said Eva Olsson, a member of the Nobel committee. "It has broad and potential implications in areas such...
  • 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
    phys.org ^ | 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
    Phys.org ^ | 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...