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Category: quantum physics – Page 4

Direct visualization captures hidden spatial order of electrons in a quantum material

The mystery of quantum phenomena inside materials—such as superconductivity, where electric current flows without energy loss—lies in when electrons move together and when they break apart. KAIST researchers have succeeded in directly observing the moments when electrons form and dissolve ordered patterns.

Research teams led by Professors Yongsoo Yang, SungBin Lee, Heejun Yang, and Yeongkwan Kim of the Department of Physics, in an international collaboration with Stanford University, have become the first in the world to spatially visualize the formation and disappearance of charge density waves (CDWs) inside quantum materials.

The research is published in Physical Review Letters.

An electrically powered source of entangled light on a chip

Quantum technologies are cutting-edge systems that can process, transfer, or store information leveraging quantum mechanical effects, particularly a phenomenon known as quantum entanglement. Entanglement entails a correlation between two or more distant particles, whereby measuring the state of one also defines the state of the others.

In recent years, quantum physicists and engineers have been trying to realize devices that operate leveraging the entanglement between individual particles of light (i.e., photons). The reliable operation of these devices relies on so-called entangled photon sources (EPSs), components that can generate entangled pairs of photons.

Researchers at University of Science and Technology of China, Jinan Institute of Quantum Technology, CAS Institute of Semiconductors and other institutes recently realized a new EPS integrated onto a single photonic chip, which can generate entangled photons via an electrically powered laser. Their study is published in Physical Review Letters.

New quantum boundary discovered: Spin size determines how the Kondo effect behaves

Collective behavior is an unusual phenomenon in condensed-matter physics. When quantum spins interact together as a system, they produce unique effects not seen in individual particles. Understanding how quantum spins interact to produce this behavior is central to modern condensed-matter physics.

Among these phenomena, the Kondo effect—the interaction between localized spins and conduction electrons—plays a central role in many quantum phenomena.

Yet in real materials, the presence of additional charges and orbital degrees of freedom make it difficult to isolate the essential quantum mechanism behind the Kondo effect. In these materials, electrons don’t just have spin, they also move around and can occupy different orbitals. When all these extra behaviors mix together, it becomes hard to focus only on the spin interactions responsible for the Kondo effect.

Entangling gates on degenerate spin qubits dressed by a global field

Global control of a qubits using a single microwave field is a promising strategy for scalable quantum computing. Here the authors demonstrate individual addressability vial local electrodes and two-qubit gates in an array of Si quantum dot spin qubits dressed by a global microwave field and driven on-resonance.

Quantum tools set to transform life science, researchers say

A team at Japan’s National Institutes for Quantum Science and Technology (QST) has published a field-defining Perspective that places the societal payoff of quantum technologies front and center: earlier disease detection, faster drug development, and new routes to clean energy. Their paper has been published online in the journal ACS Nano on December 18, 2025.

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