quantum-mechanics

If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we... Read more

A team at the University of Chicago has discovered a surprisingly simple way to create powerful quantum states that are normally difficult to produce. By making small adjustments to the energy levels of atoms inside an optical cavity, researchers can generate a wide variety of highly entangled states without adding complicated hardware.

A few updates: 1. The BBC got in touch last week to ask if I'd look at a press release and embargoed preprint on quantum computing to give some expert commentary.  The work turned out to be from Microsoft, claiming another breakthrough in their desire to fabricate functional majorana qubits.  The preprint shows their "multi-qubit" tetron device, with signals coming from its operation.  What was n…

I know that a particle or wave (correct me if I’m wrong) is an excitation of underlying quantum fields. Then there’s string theory which says that particles are “strings.” Are these two theories connected in some way?

How do a pair of particles via entanglement “know” what the other particle is doing? Any help is appreciated.

Nature Communications, Published online: 05 June 2026; doi:10.1038/s41467-026-74064-2 The authors interface the quantum Hall edge modes of Cd3As2 films with a thin superconducting NbN strip. They find that the downstream thermoelectric response alternates in sign, revealing the contribution of crossed Andreev reflections.

You have a source that spits out two photons in opposite directions. Each hits its own polariser. When the angle between the two polarisers is 22.5 degrees you still get 85% correlation, violating ...

On higher gauge theory for principal 2-bundles with connection: In a broader context of higher gauge theory and relating to the Dirac monopole: On Snyder spacetimes and Lie triple systems: Generalization of Noether's theorem to Poisson-Lie group symmetries, not necessarily acting by symplectomorphisms, for which the conserved charges may be nonabelian: On categorified Tannaka duality between quas…

On higher gauge theory relating to the Dirac monopole: Hank Chen, Florian Girelli, Gauging the Gauge and Anomaly Resolution [arXiv:2211.08549] Hank Chen, Hopf 2-Algebras: Homotopy Higher Symmetries in Physics, PhD thesis (2024) [pdf] On categorified Tannaka duality between quasitriangular 2-bialgebras and braided monoidal 2-categories:

This is still a great mystery, Einstein called it ""spooky action at a distance" But science and mathematics are full of concepts which at first cause great bafflement but in due course are just accepted. In the case of Quantum Mechanics this gave rise to the saying "Shut up and calculate". In... Read more

Hello, I am an independent researcher working on a geometric framework for theoretical physics, based on the Berry connection on an information manifold. The framework derives from the single-electron double-slit experiment. I am here to share my results and welcome technical feedback. I may... Read more

Your work assignments Research on the first-principles modelling of point defects in semiconductor materials, with an emphasis on realistic and complex environments. The studied systems are alloyed, disordered, and finite-temperature materials. The quantum-mechanical methods combined with machine-learning approaches should be used. As a PhD student, you devote most of your time to doctoral studie…

algebraic quantum field theory (perturbative, on curved spacetimes, homotopical) quantum mechanical system, quantum probability interacting field quantization The Lagrangian field theory obtained by adding the Lagrangian densities for D=3 Yang-Mills theory and of Chern-Simons theory, defined on the same gauge field/connection is 3D Yang-Mills-Chern-Simons theory (YMCS). For abelian gauge group th…

When you try to combine quantum physics with Einstein’s theories, you quickly run into some pretty serious problems. The biggest is that causality – the order in which events occur – becomes uncertain as the rest of quantum physics. A group of physicists have leveraged that uncertainty, and are now claiming that they can send messages to the past using quantum mechanics. It’s not as crazy as it

Physicists have been trying to reconcile the differences between Einstein’s theory of spacetime and our observations of quantum mechanics for almost a century. One way that they’ve attempted to do this involves theories that treat space as one-dimensional at very short distances. In a recent paper, physicists claim that they’ve solved a major problem that’s plagued these theories for decades.

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In her YouTube video Bell’s Theorem Experiments on Entangled Photons, Dr. Fugate shows how polarization-entangled photons violate Bell’s inequality. In this Insight, I will use quantum information... Read more

The MIT-led Institute for Artificial Intelligence and Fundamental Interactions (IAIFI) has received renewed support from the National Science Foundation (NSF) for an additional five years, increasing annual funding from $4 million to $4.98 million. The renewal marks a new phase for IAIFI, which has spent its first five years building a research model and an […] The post NSF renews support for MIT…

The Majorana 2 quantum processor is built from topological qubits, and its creators claim it can sustain quantum coherence for an average of 20 seconds — orders of magnitude longer than the milliseconds that conventional chips last.

Application deadline: Thursday, July 2, 2026 Research group: Applied Quantum Foundations Lab, Newcastle University (UK) Employer web page: https://jobs.ncl.ac.uk/job/Newcastle-Research-AssistantAssoc-in-Quantum/14006744... Job type: PostDoc Tags: quantum foundations quantum metrology quantum information postdoc We are seeking two research associates (or research assistants, for those who have sub…

SRI - A global leader in R&D with deep roots in Silicon Valley. QED-C executive director Celia Merzbacher and Martinis discuss innovation and the road to scalable quantum systems. The post PARC Forum: Nobel laureate John M. Martinis on the quantum frontier appeared first on SRI .