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Category: quantum physics – Page 19

Orbital Hall effect shows how defects can improve spintronic devices

Scientists have turned a longstanding challenge in electronics—material defects—into a quantum-enhanced solution, paving the way for new-generation ultra-low-power spintronic devices. Spintronics, short for “spin electronics,” is a field of technology that aims to go beyond the limits of conventional electronics.

Traditional devices rely only on the electric charge of electrons to store and process information. Spintronics takes advantage of two additional quantum properties: spin angular momentum, which can be imagined as a built-in “up” or “down” orientation of the electron, and orbital angular momentum, which describes how electrons move around atomic nuclei.

By using these extra degrees of freedom, spintronic devices can store more data in smaller spaces, operate faster, consume less energy, and retain information even when the power is switched off.

New co-assembly strategy unlocks robust circularly polarized luminescence across the color spectrum

To demonstrate practical functionality, the team incorporated various achiral luminescent dyes (red, green, blue) into the co-assembled polymer framework. The dyes were anchored via hydrogen bonding and adopted the chirality of their environment during co-assembly, resulting in CPL in all three colors.

Notably, this full-color CPL capability is rare, with red emission being especially difficult to achieve. In this system, the polymer matrix enabled chirality transfer and also passivated the dye molecules, leading to brighter, longer-lasting light with higher quantum yields compared to the same dyes used alone.

“The ability to produce strong CPL across the broadens the scope for practical applications, particularly in photonic devices that require low optical losses and high signal discrimination,” added Prof Lin.

The Quantum Future

We analyse five potential trajectories for the development of quantum computing, based on current technical achievements and fundamental challenges. We draw from recent experimental results including Google’s Willow processor achieving below-threshold error correction. We also consider IBM’s quantum roadmap and emerging classical algorithms that challenge quantum supremacy. Additionally, our evaluation includes the bifurcation between NISQ and fault-tolerant approaches.

Ripples of the future: Rice researchers unlock powerful form of quantum interference

Just as overlapping ripples on a pond can amplify or cancel each other out, waves of many kinds — including light, sound and atomic vibrations — can interfere with one another. At the quantum level, this kind of interference powers high-precision sensors and could be harnessed for quantum computing.

In a new study published in Science Advances, researchers at Rice University and collaborators have demonstrated a strong form of interference between phonons — the vibrations in a material’s structure that constitute the tiniest units, or quanta, of heat or sound in that system. The phenomenon where two phonons with different frequency distributions interfere with each other, known as Fano resonance, was two orders of magnitude greater than any previously reported.

“While this phenomenon is well-studied for particles like electrons and photons, interference between phonons has been much less explored,” said Kunyan Zhang, a former postdoctoral researcher at Rice and first author on the study. “That is a missed opportunity, since phonons can maintain their wave behavior for a long time, making them promising for stable, high-performance devices.”

Rice researchers have demonstrated a form of quantum interference two orders of magnitude greater than any previously reported.

Scientists achieve first observation of phonon angular momentum in chiral crystals

In a new study published in Nature Physics, scientists have achieved the first experimental observation of phonon angular momentum in chiral crystals.

Phonons are the quantized lattice vibrations representing sound and heat in crystals. Theoretically, phonons have been predicted to carry finite with potentially remarkable macroscopic consequences.

The famous Einstein-de Haas effect explains how quantum mechanical spin connects to classical angular momentum when a ferromagnetic cylinder rotates under magnetic fields. While this effect has been known for over a century, the phonon version had remained purely theoretical until now.

A quantum gas that refuses to heat—physicists observe many-body dynamical localization

In everyday life, continuously doing work on a system is found to heat it up. Rubbing your hands together warms them. Hammering a piece of metal makes it hot. Even without knowing the equations, we learn from experience: driving any system, whether by stirring, pressing, or striking, leads to a rise in the system’s temperature.

The same expectation holds for microscopic quantum systems: when we continuously excite a many-particle system, especially one with strong particle-particle interactions, we expect it to absorb energy and to heat up. But is this always the case, in particular at the ?

No, says an experiment carried out by a team from Hanns-Christoph Nägerl’s group at the Department of Experimental Physics of the University of Innsbruck. The research has been published in Science.

What Are the Rules of the Universe? Google’s Quantum Computer Is Finding Out

Researchers used Google’s quantum processor to simulate fundamental physics, offering a new way to study the universe’s basic forces and particles. The fundamental forces that shape our universe are explained through intricate theoretical models. These models are notoriously difficult to study be

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