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Category: quantum physics

Photoexcitation flips 2D moiré devices from metals to insulators in ultrafast test

Quantum materials, materials with properties that are governed by the laws of quantum mechanics describing many-body interactions, have proved promising for the development of various advanced technologies. Many of these materials undergo so-called phase transitions, switching between different physical states that alter how electrons flow through them.

Some previous studies have demonstrated the transition from insulating states to metallic states in quantum materials, via a process called photoexcitation (i.e., the excitation of electrons using light). Yet the opposite transition, from metallic to insulating states, has so far proved difficult to realize using light alone.

Researchers at Columbia University, in collaboration with UC Riverside, recently demonstrated an ultrafast photo-induced metal-to-insulator transition in two-dimensional (2D) moiré heterostructures, quantum materials consisting of 2D layers stacked on top of each other, with a slight misalignment between them.

Quantum shell structure reveals new rule for proton-neutron pairing inside nuclei

Nuclear physicists used a little magic in their latest experiment conducted at the U.S. Department of Energy’s Thomas Jefferson National Accelerator Facility, and the result has revealed surprising new information about the behavior of protons and neutrons inside the atom’s nucleus. Specifically, the research revealed another requirement that determines how protons and neutrons pair up.

The result is reported in the journal Nature.

The research involves short-range correlations (SRCs). This phenomenon describes when a proton and a neutron, or two protons or two neutrons, briefly pair up inside the nucleus.

Chip-scale ‘acoustic atom’ controls sound waves to imitate atomic energy levels and advance computing

For every action, there is an equal and opposite reaction. What goes up must come down. Physical laws like these govern all of the natural world—except for the tiny internal components of today’s microprocessors, which operate according to the unique and complicated rules of quantum physics.

As the microprocessors that power computers, medical equipment, sensors, and more continue to shrink in size, engineers face challenges controlling quantum-scale systems. But in a step forward for the technology, researchers at Virginia Tech have developed an “acoustic atom”—a chip-scale device that traps and controls sound waves in ways that mimic the behavior of real atoms. Long term, these advances could influence technologies connected to quantum artificial intelligence (AI), telecommunication, medical imaging, GPS, and more.

The research is published in Physical Review Letters by Linbo Shao, assistant professor in Virginia Tech’s Bradley Department of Electrical and Computer Engineering, along with colleagues at the university’s Center for Power Electronic Systems, Department of Physics, and Center for Quantum Information Science and Engineering and the Oak Ridge National Laboratory.

‘Don’t scare the cat!’ Engineers find smarter way to measure quantum systems

UNSW Sydney engineers have riffed on the famous Schrödinger’s cat analogy to demonstrate a more efficient way to eliminate errors in quantum computing.

“Imagine you’re trying to find your cat hiding in one of eight identical cardboard boxes, in a dark and noisy room,” says UNSW Scientia Professor Andrea Morello.

“You are not allowed to enter the room—opening the door may kill the cat. What is the optimal strategy to find out where it’s hiding? Our team of quantum researchers have found an answer to this problem, and it might be an important milestone on the road to building a quantum computer.”

Nanomagnets control diamond qubits, pointing to more scalable quantum hardware

Quantum computing, once only a theoretical possibility, promises to deliver faster, more energy-efficient computers—but only if scientists can build and scale the hardware needed to run the machines. New research from Virginia Commonwealth University brings scientists one small step closer to quantum computing at a practical scale, which could help dramatically reduce energy usage and computing times in some industries.

In the study, recently published in Nature Communications, the researchers used minuscule magnets—twice as small as the wavelength of light—to create the building blocks of quantum computing, pioneering a technique that could decrease the physical space needed to create a viable quantum computer.

“This work has the potential to advance quantum computing,” said Jayasimha Atulasimha, Ph.D., a professor of mechanical and nuclear engineering in VCU’s College of Engineering and the study’s principal investigator. “We’re solving a specific problem for spin-based quantum computing, which has the potential for scaling.”

Study Suggests Spacetime Can Crystallize Possibly Solving Several Mysteries

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Hello and welcome! My name is Anton and in this video, we will talk about crystallization of spacetime.
Links:
https://journals.aps.org/prl/pdf/10.1…
#science #physics #spacetime.

0:00 Can spacetime crystallize?
0:35 So what is this then?
1:55 Let’s define the main terms and phenomena: spacetime.
2:30 Crystals.
2:55 Spacetime crystal.
3:50 Previous challenges and propositions.
5:10 Main achievement in the study.
6:10 What does any of this mean for us?
7:10 Solving singularity and quantum gravity?
8:05 Explaining dark matter?
8:45 JWST observations.
9:28 Any proof? Gravitational waves!
11:55 Conclusions.

Enjoy and please subscribe.

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What If Scientists Already PROVED We’re In A Simulation?| Truth By Lisa Randall

If Scientists Already PROVED We’re In A Simulation?
Bell’s theorem. Maldacena’s holographic proof. Wheeler’s participatory universe.
Three independent bodies of peer-reviewed physics — all pointing at the same unsettling answer.
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Bell’s theorem. Maldacena’s holographic proof. Wheeler’s participatory universe.
Three independent bodies of peer-reviewed physics — all pointing at the same unsettling answer.
What if the simulation hypothesis isn’t a thought experiment? What if the physics we already have — quantum entanglement, the holographic principle, the measurement problem — is the proof?
In this video, Harvard theoretical physicist Lisa Randall walks through the three experiments and mathematical proofs that, taken together, describe a universe that functions in every measurable way like a simulation. Not as metaphor. As structure.
We cover:
→ Alain Aspect’s 1982 Bell test experiment and what it actually proved about local reality.
→ The Bekenstein-Hawking holographic bound — why information scales with surface area, not volume.
→ Maldacena’s AdS/CFT correspondence — the proof that a 3D universe is dual to a 2D information system.
→ Wheeler’s delayed choice experiment and the participatory universe.
→ What the fine-tuning problem looks like inside a simulation framework.
→ Why you — the observer — are not peripheral to the physics. You are part of the mechanism.
This is Episode 1 of The Proof Series — a weekly deep-dive into peer-reviewed science that challenges everything you think you know about reality.
New episode every Thursday.
— Lisa Randall is a theoretical physicist and professor at Harvard University, author of Warped Passages and Dark Matter and the Dinosaurs, and one of the most cited physicists alive.
#SimulationTheory #QuantumPhysics #HolographicUniverse.
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3. TIMESTAMPS / CHAPTERS
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00:00 — The proof nobody is talking about.
01:10 — What \

Cutting a photon in two creates an infinite swarm of particles

By definition, elementary particles can’t be broken into smaller pieces. But in a new theoretical study published in Physical Review Letters, Johannes Skaar and colleagues have revealed what would happen if you tried anyway for a single photon. The answer is deeply strange: attempting to cut a photon in two wouldn’t produce two smaller photons, but instead conjure an infinite number of them out of thin air.

Like any quantum particle, a photon exists simultaneously as a single, localized particle, and an extended wave, spread out across space. For their investigation, Skaar’s team considered what would happen if a single photon passed through an optical shutter—essentially a very fast mirror that can be switched on and off to block part of a pulse of light. If the shutter was fast enough, it could intercept the photon mid-pulse, snipping off part of this extended wave.

To find out what would happen afterward, the researchers applied quantum equations that describe how the photon’s underlying electromagnetic field behaves at the quantum level. Specifically, their analysis tracked precisely how the photon’s quantum state would be transformed by the shutter’s intervention.

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