Results from a UK collaboration mark a major advance toward building large-scale quantum sensors.
Category: quantum physics – Page 31
The Sleepy Scientist
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Explore the strange hidden layer beneath ordinary reality, where particles are not tiny solid objects, but excitations of invisible quantum fields. 🌌 From light and matter to atoms, forces, chemistry, and the structure of the universe itself, this relaxing science journey explains how quantum field theory reshaped our understanding of what reality is made from.
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Which Quantum Interpretations Survive Constructor Theory? | Chiara Marletto
Can a new framework for physics help evaluate competing interpretations of quantum mechanics?
Chiara Marletto examines Copenhagen, Bohmian mechanics, Many Worlds, collapse theories, QBism, relational quantum mechanics, and other approaches through the lens of constructor theory. Rather than choosing a winner, she asks which interpretations are compatible with deeper physical principles.
0:00 Constructor Theory as a Framework for Quantum Foundations.
1:25 Copenhagen and Bohmian Mechanics: Where Constructor Theory Parts Ways.
4:26 Many Worlds and Compatible Interpretations.
7:21 QBism, Relational Quantum Mechanics, and Superdeterminism.
13:14 Constructor Theory Beyond Quantum Interpretations.
Chiara Marletto is a Research Fellow at Wolfson College, University of Oxford. She holds degrees from the universities of Oxford and Turin. Her main research focus is in theoretical physics, and she also pursues interests in theoretical biology, epistemology, and Italian literature. The Science of Can and Can’t was her first trade book.
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The Quantum Era: Accelerating Quantum Computing Roadmap/Resource: Navigating Rapid Technological Progress
Quantum technologies have transitioned from theoretical physics to practical application more swiftly than many expected. Quantum computers represent a paradigm shift in computation. Quantum computing is becoming increasingly feasible, thanks to recent advancements that make it simpler to build and more effective at scaling. Quantum computing, sensing, encryption, and networking are set to provide exponential computational capabilities while concurrently disrupting cybersecurity frameworks.
Quantum computing will empower computers to analyze vast amounts of data and perform calculations at unprecedented speeds. It will only take a few seconds to download libraries.
Excitons in van der Waals magnetic materials
Abstract:
Two-dimensional magnetic semiconductors provide a unique platform where long-range magnetic order coexists with strongly bound excitons. Because excitonic states and magnetic moments originate from the same electronic orbitals and couple via intrinsic exchange interactions, optical excitations in these systems exhibit pronounced sensitivity to magnetic order. Recent experiments show unusually strong magneto-optical responses and direct exciton–magnon coupling, establishing new routes for controlling light–matter interactions with spin degrees of freedom. This Review surveys key developments, focusing on representative material systems, experimental signatures, and theoretical frameworks used to describe these phenomena. We conclude with perspectives on how this rapidly evolving field could enable next-generation optoelectronic and quantum technologies leveraging the coupled dynamics of light, charge and spin.
In this Review, the interplay of excitons, magnons and photons in two-dimensional magnetic semiconductors and how this enables control of light–matter interactions are discussed, and promising opportunities for magneto-optic optoelectronic and quantum applications are surveyed.
New optical centrifuge unlocks the secrets of frictionless superfluids
Physicists have developed a new way to control the rotation of molecules inside tiny droplets of liquid helium, marking an important advance in the study of superfluids. By using a specially designed optical centrifuge, the team was able to precisely spin molecules suspended in liquid helium nano-droplets, giving scientists a powerful new tool for exploring these unusual frictionless materials.
The achievement represents the first successful demonstration of controlled molecular rotation inside a superfluid. Researchers can now directly adjust both the direction and speed of a molecule’s rotation, making it possible to investigate how molecules interact with their quantum surroundings at different rotational frequencies. The work, led by researchers at the University of British Columbia (UBC) in collaboration with the University of Freiburg, was published in Physical Review Letters.
“Controlling the rotation of a molecule dissolved in any fluid is a challenge,” said Dr. Valery Milner, associate professor with UBC Physics and Astronomy and author on the paper.
Plug-and-play single-photon source can work at room temperature
The Korea Research Institute of Standards and Science (KRISS) has developed a room-temperature single-photon source built into a compact 19-inch rack-mounted device that operates without cryogenic cooling. Designed as a plug-and-play system that works as soon as it is powered on, the device moves quantum light source technology beyond the laboratory and closer to practical, onsite use.
The study is published in the journal Laser & Photonics Reviews.
A single-photon source is a device that generates particles of light, or photons, one at a time. It serves as the starting point for photon-based quantum technologies such as quantum communication, quantum sensing and quantum measurement.
Ultrafast scanning tunneling microscopy reaches the quantum mechanical space-time limit for the first time
Werner Heisenberg’s famous uncertainty principle describes one of the most intriguing features of quantum physics: certain pairs of physical quantities describing a particle, such as position and momentum, cannot simultaneously be determined with arbitrary precision—not because of imprecise measuring instruments, but because nature forbids it. Between position and time, however, there is no Heisenberg uncertainty principle.
A research team comprising several groups at RUN led by Profs. Jascha Repp, Rupert Huber, Franz Giessibl, and Klaus Richter, as well as a team from the Max Planck Institute in Hamburg led by Angel Rubio, has now observed for the first time that the location and time evolution of an electron cannot be measured with arbitrary precision simultaneously. This so-called space-time limit has important implications for future applications. The work is published in the journal Nature Photonics.
Many future technologies, from green tech and quantum technologies to high-performance electronics for artificial intelligence, require a precise understanding of how matter functions at the microscopic level: how chemical reactions occur, how light interacts with matter, and how electrons move through electronic components. High-resolution still images of the microscopic building blocks of matter are not sufficient for this; rather, time-resolved slow-motion movies from the nanocosmos are needed.
Physicists Create an Exotic New Form Of Matter: The ‘Fermi Sea’
At the lowest temperatures in the Universe, physics gets funky.
When atoms are cooled to just above absolute zero (−459.67 degrees Fahrenheit, or-273.15 degrees Celsius), they can conduct electricity without resistance, become ’super-particle’ clouds, or flow without friction and climb up the walls of their containers.
Existence at the smallest, coldest scales is ruled by quantum statistics, which determine the behavior of bosons and fermions: the two families of fundamental particles thought to comprise every thing in the Universe.
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