https://phys.org/physics-news/quantum-physics en-us The latest news on quantum physics, wave particle duality, quantum theory, quantum mechanics, quantum entanglement, quantum teleportation, and quantum computing. Researchers at ETH Zurich have shown that quantum states of single electron spins can be controlled by currents of electrons whose spins are evenly aligned. In the future, this method could be used in electronic circuit elements. https://phys.org/news/2024-06-alternative-quantum-states.html Condensed Matter Quantum Physics Thu, 20 Jun 2024 15:44:26 EDT news638117062 Scientists on the hunt for compact and robust sources of multicolored laser light have generated the first topological frequency comb. Their result, which relies on a small silicon nitride chip patterned with hundreds of microscopic rings, appears in the journal Science. https://phys.org/news/2024-06-photonic-chip-spawns-topological-frequency.html Optics & Photonics Quantum Physics Thu, 20 Jun 2024 15:42:04 EDT news638116921 A team of international scientists led by the University of Ottawa have gone back to the kitchen cupboard to create a recipe that combines organic material and light to create quantum states. https://phys.org/news/2024-06-qa-method-confines-material-hybrid.html Optics & Photonics Quantum Physics Thu, 20 Jun 2024 12:17:00 EDT news638104614 The quantum internet would be a lot easier to build if we could use existing telecommunications technologies and infrastructure. Over the past few years, researchers have discovered defects in silicon—a ubiquitous semiconductor material—that could be used to send and store quantum information over widely used telecommunications wavelengths. Could these defects in silicon be the best choice among all the promising candidates to host qubits for quantum communications? https://phys.org/news/2024-06-platform-probe-qubits-silicon-quantum.html Optics & Photonics Quantum Physics Wed, 19 Jun 2024 11:23:03 EDT news638014981 A joint research team that included members from Tohoku University has unveiled a new topological insulator (TI), a unique state of matter that differs from conventional metals, insulators, and semiconductors. https://phys.org/news/2024-06-discovery-dimensional-topological-insulator-qubits.html Condensed Matter Quantum Physics Wed, 19 Jun 2024 09:12:48 EDT news638007164 A research group from University of Tsukuba has discovered that fluctuations of electron spins in magnetic materials trigger a large anomalous Hall effect during phase transition known as the devil's staircase magnetic transition. https://phys.org/news/2024-06-large-anomalous-hall-effect-triggered.html Condensed Matter Quantum Physics Tue, 18 Jun 2024 09:50:02 EDT news637923001 While investigating how string theory can be used to explain certain physical phenomena, scientists at the Indian Institute of Science (IISc) have stumbled upon on a new series representation for the irrational number π. It provides an easier way to extract π from calculations involved in deciphering processes like the quantum scattering of high-energy particles. https://phys.org/news/2024-06-physicists.html General Physics Quantum Physics Tue, 18 Jun 2024 09:28:04 EDT news637921679 The potential of quantum computers is currently thwarted by a trade-off problem. Quantum systems that can carry out complex operations are less tolerant to errors and noise, while systems that are more protected against noise are harder and slower to compute with. https://phys.org/news/2024-06-quantum-problem.html Optics & Photonics Quantum Physics Tue, 18 Jun 2024 09:01:04 EDT news637920061 The so-called Casimir force or Casimir effect is a quantum mechanical phenomenon resulting from fluctuations in the electromagnetic field between two conducting or dielectric surfaces that are a short distance apart. Studies have shown that this force can be either be attractive or repulsive, depending on the dielectric and magnetic properties of the materials used in experiments. https://phys.org/news/2024-06-method-reversibly-casimir-external-magnetic.html Condensed Matter Quantum Physics Tue, 18 Jun 2024 07:30:01 EDT news637857959 A research team has utilized solid-state spin quantum sensors to scrutinize exotic spin-spin-velocity-dependent interactions (SSIVDs) at short force ranges, reporting new experimental results between electron spins. Their work has been published in Physical Review Letters. https://phys.org/news/2024-06-constraints-exotic-velocity-interactions-electron.html Quantum Physics Mon, 17 Jun 2024 16:49:55 EDT news637861793 One of the most counter-intuitive aspects of quantum physics is the idea that a quantum system, unlike a physical system governed by the everyday physics of the macroscopic universe, can exist in two states at once even if these states are contradictory. https://phys.org/news/2024-06-schrdinger-cat-quantum-sensitivity.html Quantum Physics Mon, 17 Jun 2024 14:01:20 EDT news637851678 Quantum computing is like Forrest Gump's box of chocolates: You never know what you're gonna get. Quantum phenomena—the behavior of matter and energy at the atomic and subatomic levels—are not definite, one thing or another. They are opaque clouds of possibility, or more precisely, probabilities. When someone observes a quantum system, it loses its quantum-ness and "collapses" into a definite state. https://phys.org/news/2024-06-quantum-kaleidoscopes-unusual-metaphors-science.html Quantum Physics Mon, 17 Jun 2024 12:40:01 EDT news637845588 An experiment by a group of physicists led by University of Rochester physics professor Regina Demina has produced a significant result related to quantum entanglement—an effect that Albert Einstein called "spooky action at a distance." https://phys.org/news/2024-06-physicists-quantum-entanglement-persists-quarks.html Quantum Physics Fri, 14 Jun 2024 16:09:56 EDT news637600192 A team of researchers led by Philip Walther at the University of Vienna carried out a pioneering experiment where they measured the effect of the rotation of Earth on quantum entangled photons. The work, published in Science Advances, represents a significant achievement that pushes the boundaries of rotation sensitivity in entanglement-based sensors, potentially setting the stage for further exploration at the intersection between quantum mechanics and general relativity. https://phys.org/news/2024-06-quantum-entangled-photons-react-earth.html General Physics Quantum Physics Fri, 14 Jun 2024 14:00:01 EDT news637573742 Halide perovskites are a class of materials with an underlying structure resembling that of mineral perovskites, but with X sites occupied by halide ions, while their A and B sites are occupied by cations. These materials have various advantageous properties that make them promising candidates for the development of photovoltaics (PVs), light-emitting diodes (LEDs) and other optoelectronic devices. https://phys.org/news/2024-06-exploring-polaron-formation-halide-perovskites.html Condensed Matter Quantum Physics Fri, 14 Jun 2024 08:20:01 EDT news637491282 Research teams led by Prof. Zeng Changgan and Zhang Hui from the Hefei National Laboratory for Physical Sciences at the Microscale, the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences have achieved a reversible transition from the Casimir attraction to repulsion under magnetic field control by using a magnetic fluid as an intermediate medium. Their study is published in Nature Physics. https://phys.org/news/2024-06-tune-casimir-magnetic-fields.html Condensed Matter Quantum Physics Thu, 13 Jun 2024 11:07:02 EDT news637495621 Spontaneous parametric down-conversion (SPDC), as a source of entangled photons, is of great interest for quantum physics and quantum technology, but so far it could be only implemented in solids. https://phys.org/news/2024-06-liquid-crystal-source-photon-pairs.html Optics & Photonics Quantum Physics Thu, 13 Jun 2024 10:31:03 EDT news637493461 Researchers at QuTech have found a way to make Majorana particles in a two-dimensional plane. This was achieved by creating devices that exploit the combined material properties of superconductors and semiconductors. The inherent flexibility of this new 2D platform should allow one to perform experiments with Majoranas that were previously inaccessible. The results are published in Nature. https://phys.org/news/2024-06-route-scalable-majorana-qubits.html Quantum Physics Wed, 12 Jun 2024 14:03:48 EDT news637419823 Waves pick up information from their environment through which they propagate. A theory of information carried by waves has now been developed at TU Wien—with astonishing results that can be utilized for technical applications. https://phys.org/news/2024-06-theory.html Optics & Photonics Quantum Physics Wed, 12 Jun 2024 11:22:59 EDT news637410176 Quantum computers have the potential to solve complex problems in human health, drug discovery, and artificial intelligence millions of times faster than some of the world's fastest supercomputers. A network of quantum computers could advance these discoveries even faster. But before that can happen, the computer industry will need a reliable way to string together billions of qubits—or quantum bits—with atomic precision. https://phys.org/news/2024-06-technique-quantum-future.html Quantum Physics Tue, 11 Jun 2024 11:38:03 EDT news637324681 A new study in Physical Review Letters (PRL) introduces the concept of pseudomagic quantum states, which appear to have high stabilizerness (or complexity) and can move us closer to achieving quantum supremacy. https://phys.org/news/2024-06-pseudomagic-quantum-states-path-supremacy.html Quantum Physics Tue, 11 Jun 2024 08:50:01 EDT news637231355 The Korea Research Institute of Standards and Science (KRISS) has developed a novel quantum sensor technology that allows the measurement of perturbations in the infrared region with visible light by leveraging the phenomenon of quantum entanglement. This will enable low-cost, high-performance IR optical measurement, which previously accompanied limitations in delivering quality results. https://phys.org/news/2024-06-quantum-sensor-limits-optical-entanglement.html Optics & Photonics Quantum Physics Mon, 10 Jun 2024 15:38:28 EDT news637252706 Similar to how a radio antenna plucks a broadcast from the air and concentrates the energy into a song, individual atoms can collect and concentrate the energy of light into a strong, localized signal that researchers can use to study the fundamental building blocks of matter. https://phys.org/news/2024-06-quantum-optical-antennas-powerful-atomic.html Optics & Photonics Quantum Physics Mon, 10 Jun 2024 13:33:04 EDT news637245181 The experimental generation of increasingly intense light beams could help to unveil new physical regimes occurring in the presence of very strong electromagnetic fields. While some progress has been made towards this goal, physicists are yet to develop a reliable strategy to achieve extreme light intensities. https://phys.org/news/2024-06-interact-extreme-intensities-schwinger-limit.html Plasma Physics Quantum Physics Mon, 10 Jun 2024 09:50:01 EDT news637231302 In physics, nonreciprocity occurs when a system's response varies depending on the direction in which waves or signals are propagating within it. This asymmetry arises from a break in so-called time-reversal symmetry, which essentially means that a system's processes observed as they evolve over time will be different compared to those processes observed on rewind. https://phys.org/news/2024-06-nonreciprocal-quantum-batteries-remarkable-capacities.html Quantum Physics Sat, 08 Jun 2024 08:30:02 EDT news636971189 When element 61, also known as promethium, was first isolated by scientists at the Department of Energy's Oak Ridge National Laboratory in 1945, it completed the series of chemical elements known as lanthanides. However, aspects of the element's exact chemical nature have remained a mystery until last year, when a team of scientists from ORNL and the National Institute of Standards and Technology used a combination of experimentation and computer simulation to purify the promethium radionuclide and synthesize a coordination complex that was characterized for the first time. The results of their work were recently published in Nature. https://phys.org/news/2024-06-quantum-chemistry-simulation-characterize-complex.html Quantum Physics Fri, 07 Jun 2024 14:44:40 EDT news636990277 Deep under the ground at Fermi National Accelerator Laboratory is a brand-new quantum sensor and computing research center called QUIET, and at the surface—100 meters above—sits its twin called LOUD. https://phys.org/news/2024-06-quiet-qubits-shielded-effects-cosmic.html General Physics Quantum Physics Fri, 07 Jun 2024 11:34:52 EDT news636978888 Thousands of particles of light can merge into a type of "super photon" under suitable conditions. Physicists call such a state a photon Bose-Einstein condensate. https://phys.org/news/2024-06-perturbations-super-photons.html Optics & Photonics Quantum Physics Fri, 07 Jun 2024 11:02:03 EDT news636976921 Scientists have used computational algebraic geometry to study predictions for particle physics experiments, such as those at the Large Hadron Collider (LHC), which first detected the Higgs particle in 2012. https://phys.org/news/2024-06-edge-mathematics-tool-particle-collision.html General Physics Quantum Physics Fri, 07 Jun 2024 09:40:01 EDT news636971997 One of the biggest challenges in quantum technology and quantum sensing is "noise"–seemingly random environmental disturbances that can disrupt the delicate quantum states of qubits, the fundamental units of quantum information. https://phys.org/news/2024-06-noise-quantum.html Quantum Physics Fri, 07 Jun 2024 09:36:59 EDT news636971813