Computing

Researchers control quantum states with spin-polarized currents

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Researchers at ETH Zurich have achieved a significant breakthrough in quantum physics by demonstrating that quantum states of single electron spins can be controlled using spin-polarized electron currents. This pioneering method holds potential for future applications in electronic circuit elements, potentially revolutionizing data storage and processing. The Spin of Electrons Electrons possess an intrinsic angular … Read more

Physicists achieve breakthrough in quantum entanglement with top quarks

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A team of physicists led by University of Rochester professor Regina Demina has made a groundbreaking discovery in the realm of quantum entanglement, an enigmatic phenomenon famously referred to by Albert Einstein as “spooky action at a distance.” Quantum entanglement involves the interlinked behavior of tiny particles that, once having interacted, can influence each other … Read more

Record-breaking fusion data now open to all

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High-temperature fusion plasma experiments conducted in the Large Helical Device (LHD) of the National Institute for Fusion Science (NIFS), have renewed the world record for an acquired data amount, 0.92 terabytes (TB) per experiment, in February 2022, by using a full range of state-of-the-art plasma diagnostic devices. The International Thermonuclear Experimental Reactor (ITER), which is … Read more

New method for quieting the quantum world

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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. Looking deeper at this issue, JILA Associate Fellow and University of Colorado Boulder Physics Assistant Professor Shuo Sun collaborated with Andrés Montoya-Castillo, Assistant Professor … Read more

Scientists unravel the electronic structure of promethium

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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 … Read more

Scientists discover unforeseen vortex behavior in light particles

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Vortices are a common physical phenomenon. You find them in the structure of galaxies, tornadoes and hurricanes, as well as in a cup of tea, or water as it drains from the bathtub. Normally, vortices are formed when very fast-flowing air, water or another substance encounters an area with a slower flow. They are characterized … Read more

Quantum system-on-chip architecture for large-scale quantum computing

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Quantum computers hold the promise of solving extremely complex problems rapidly—tasks that could take the world’s most powerful supercomputers decades to crack. However, achieving such performance requires building a system with millions of interconnected qubits. The creation and control of such vast numbers of qubits in a hardware architecture is a formidable challenge that scientists … Read more

Scientists develop data-driven method to speed up electron-phonon interaction calculations

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Materials scientists and engineers aim to understand electron interactions and movements in novel materials to predict the behavior of devices made from these materials. Key questions include whether electrical current will flow easily, if there is a temperature at which the material becomes superconducting, and how long the quantum state of an electron spin will … Read more

Researchers develop compact device for characterizing quantum photons

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An increasing number of emerging quantum applications operate using optical technologies. Essentially, photons carry information at the speed of light and over long distances, making them good candidates for fast and secure communications and quantum computing. Many of these applications require photons that are identical (indistinguishable). When the photons are not identical, it can lead … Read more

New approach uses non-gaussian states to describe and control spin-boson systems in quantum devices

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Many of today’s quantum devices rely on collections of qubits, also called spins. These quantum bits have only two energy levels, the “0” and the “1.” However, spins in real devices also interact with light and vibrations known as bosons, greatly complicating calculations. In a new publication in Physical Review Letters, researchers in Amsterdam demonstrate … Read more

Scientists achieve chip-scale entangled photon source in silicon carbide

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Quantum information science is truly fascinating—pairs of tiny particles can be entangled such that an operation on either one will affect them both even if they are physically separated. A seemingly magical process called teleportation can share information between different far-flung quantum systems. These different systems can be coupled using quantum processes to form quantum … Read more

Miniaturized quantum light detector paves way for scalable quantum technologies

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Researchers at the University of Bristol have made an important breakthrough in scaling quantum technology by integrating the world’s tiniest quantum light detector onto a silicon chip. The paper, “A Bi-CMOS electronic photonic integrated circuit quantum light detector,” was published in Science Advances. A critical moment in unlocking the information age was when scientists and engineers … Read more

Harvard-led review examines progress in majorana research for quantum computing

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Named after an Italian theoretical physicist, Majoranas are complex quasiparticles that could be the key to building next-generation quantum computing systems. Most materials contain many electrons, each of which has a negative charge and a type of intrinsic quantum momentum known as spin. Interactions between electrons in some materials can produce emergent particles, or particles … Read more

Study suggests rethinking time steps in water simulations for improved accuracy

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Computational scientists at the Department of Energy’s Oak Ridge National Laboratory have published a study in the Journal of Chemical Theory and Computation that questions a long-accepted factor in simulating the molecular dynamics of water: the 2-femtosecond (one quadrillionth of a second) time step. The femtosecond is a timescale used by scientists to measure the … Read more

High-intensity spatial-mode steerable frequency up-converters for on-chip integrated photonics

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The field of integrated photonics is experiencing a revolution with the development of high-intensity spatial-mode steerable frequency up-converters, as discussed in a recent study published in Opto-Electronic Science. These devices play a pivotal role in on-chip integration, enabling control over photon spatial modes, frequencies, angular momenta, and phases—all essential for advanced quantum entangled states, photon … Read more

Researchers develop tunable nonreciprocal device for quantum computers

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Scientists led by the University of Massachusetts Amherst have adapted a device called a microwave circulator for use in quantum computers, allowing them for the first time to precisely tune the exact degree of nonreciprocity between a qubit, the fundamental unit of quantum computing, and a microwave-resonant cavity. The ability to precisely tune the degree … Read more

Researchers discover new entropy rule for quantum entanglement transformations

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Bartosz Regula, from the RIKEN Center for Quantum Computing, and Ludovico Lami, from the University of Amsterdam, have unveiled a groundbreaking discovery regarding the elusive nature of quantum entanglement. Their findings, rooted in probabilistic calculations, shed light on a long-hypothesized rule of entropy governing quantum entanglement, a phenomenon central to the potential power of future … Read more

Study solves lag mystery in organic electrochemical transistors (OECTs)

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Researchers who want to bridge the divide between biology and technology spend a lot of time thinking about translating between the two different “languages” of those realms. “Our digital technology operates through a series of electronic on-off switches that control the flow of current and voltage,” said Rajiv Giridharagopal, a research scientist at the University … Read more

New blueprint for quantum error correction uses qLDPC codes and reconfigurable atom arrays

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The fragile qubits that make up quantum computers offer a powerful computational tool, yet also present a conundrum: How can engineers create practical, workable quantum systems out of bits that are so easily disturbed—and wiped of data—by tiny changes in their environment? Engineers have long struggled with how to make quantum computers less error-prone, often … Read more

Scientists achieve frequency-domain photon number-path entanglement

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Scientists have introduced a form of quantum entanglement known as frequency-domain photon number-path entanglement. This advance in quantum physics involves an innovative tool called a frequency beam splitter, which has the unique ability to alter the frequency of individual photons with a 50% success rate. For years, the scientific community has delved into spatial-domain photon … Read more