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Category: quantum physics – Page 29

Scientists have achieved a major milestone in the quest to understand high-temperature superconductivity in hydrogen-rich materials. Using electron tunneling spectroscopy under high pressure, the international research team led by the Max Planck Institute for Chemistry has measured the superconducting gap of H3S—the material that set the high-pressure superconductivity record in 2015 and serves as the parent compound for subsequent high-temperature superconducting hydrides.

The findings, published this week in Nature, provide the first direct microscopic evidence of in hydrogen-rich materials and an important step toward its scientific understanding.

Superconductors are materials that can carry electrical current without resistance, making them invaluable for technologies such as energy transmission and storage, magnetic levitation, and quantum computing.

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Quantum messages sent across a 254-km telecom network in Germany represent the first known report of coherent quantum communications using existing commercial telecommunication infrastructure.

The demonstration, reported in Nature this week, suggests that quantum communications can be achieved in real-world conditions.

Quantum networks have the potential to enable , such as a quantum internet; quantum is one example of a theoretically secure communication technique.

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An exact expression for a key process needed in many quantum technologies has been derived by a RIKEN mathematical physicist and a collaborator. This could help to guide advances in quantum technologies.

Many emerging such as and quantum communication rely on .

Entanglement is the mysterious phenomenon whereby two or more particles become so closely interconnected that, no matter how great the distance between them, they exhibit quantum correlations that far exceed the mutual relations achievable in .

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In the intricate world of quantum physics, where particles interact in ways that seem to defy the standard rules of space and time, lies a profound mystery that continues to captivate scientists: the nature of deconfined quantum critical points (DQCPs). These elusive critical phenomena break away from the conventional framework of physics, offering a fascinating glimpse into a realm where quantum matter behaves in ways that challenge our classical understanding of the fundamental forces shaping the universe.

A recent study, led by Professor Zi Yang Meng and co-authored by his Ph.D. student Menghan Song of HKU Department of Physics, in collaboration with researchers from the Chinese University of Hong Kong, Yale University, University of California, Santa Barbara, Ruhr-University Bochum and TU Dresden, has unraveled some of the secrets concealed within the entangled web of .

Their findings, recently published in Science Advances, push the boundaries of modern physics and offer a fresh perspective on how operates at these enigmatic junctures. The study not only deepens our understanding of quantum mechanics but also paves the way for future discoveries that could revolutionize technology, materials science, and even our understanding of the cosmos.

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In new research published in Nature, Weizmann Institute scientists introduce a powerful tool to explore quantum phenomena—the cryogenic Quantum Twisting Microscope (QTM).

Using this pioneering instrument, researchers have observed—for the first time—the interactions between electrons and an exotic atomic vibration in twisted sheets of graphene, called a phason. These findings shed new light on the mysterious superconductivity and strange metallicity that emerge when graphene sheets are rotated to the magic angle.

The fundamental properties of materials depend critically on their underlying particles—the flow of electrons governs , and atomic lattice vibrations, termed phonons, drive heat conductivity. However, when electrons and phonons are coupled, remarkable new phenomena can emerge.

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Check out my own quantum mechanics course on Brilliant! First 30 days are free and 20% off the annual premium subscription when you use our link ➜ https://brilliant.org/sabine.

Chaos doesn’t exist in the world of quantum physics, as quantum physics is a linear theory. So how come we observe chaos all around us? Researchers have now come one step closer to understanding how it happens. They have for the first time measured a “quantum scar”, that is a quantum effect which deviates from chaos. Why does this matter and what could it be good for? Let’s take a look.

Paper: https://www.nature.com/articles/s4158… lovely animation for the spread of the wavefunction in the stadium and heart come from the Quantum Physics Corner: • Quantum heart billiard 🤓 Check out my new quiz app ➜ http://quizwithit.com/ 💌 Support me on Donorbox ➜ https://donorbox.org/swtg 📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 👉 Transcript with links to references on Patreon ➜ / sabine 📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle… 👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl… 🔗 Join this channel to get access to perks ➜ / @sabinehossenfelder 🖼️ On instagram ➜ / sciencewtg #science #sciencenews #physics #quantumphysics.

The lovely animation for the spread of the wavefunction in the stadium and heart come from the Quantum Physics Corner: • Quantum heart billiard.

🤓 Check out my new quiz app ➜ http://quizwithit.com/
💌 Support me on Donorbox ➜ https://donorbox.org/swtg.
📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/
👉 Transcript with links to references on Patreon ➜ / sabine.
📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle…
👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl…
🔗 Join this channel to get access to perks ➜
/ @sabinehossenfelder.
🖼️ On instagram ➜ / sciencewtg.

#science #sciencenews #physics #quantumphysics

Continue reading “Scientists Uncover Hidden Pattern in Quantum Chaos” | >

We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydberg states in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopy experiments. We show that the intricate time dependence of such wave packets can be used for investigating quantum defects and performing artifact-free timekeeping. The latter relies on the unique fingerprint that is created by the time-dependent photoionization of these complex wave packets. These fingerprints determine how much time has passed since the wave packet was formed and provide an assurance that the measured time is correct. Unlike any other clock, this quantum watch does not utilize a counter and is fully quantum mechanical in its nature.

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A device made of multilayer graphene exhibits topologically protected edge currents whose direction can be switched using an electric field.

Topological phases of matter have captivated physicists for several decades, promising exotic phenomena and new paradigms for electronic devices [1]. So-called Chern insulators—systems exhibiting quantized Hall conductance without an external magnetic field—are particularly enticing. These materials support dissipationless, one-way electron transport along their edges, which could enable robust low-power electronics or even form the backbone of future topological quantum-computing architectures [2]. Yet, the defining feature of a Chern insulator—its chirality, which determines the direction of the edge-state current—is set by material symmetry and is therefore notoriously rigid and difficult to manipulate dynamically [3–5].

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