[...] my guess for the outcome of the active search for a satisfactory understanding of quantum mechanics, is that some different “big picture” will arise, which is not “many worlds,” but which still upholds Hugh Everett’s conviction that paranormal influences will not overrule the Schrödinger equation. — Charles W. Misner

Quantum particles can move opposite to their momentum This "quantum backflow" was thought to be tiny (~4%). New work shows it can reach ~13% in more realistic states — an over 3× increase that brings this counter-intuitive effect closer to its first experimental realization ⚛️🔬 Read more: doi.org/10.1103/tm9s-pkg5 or doi.org/10.48550/arXiv.2511.…

6 years on Twitter/X today! Thankful for the people, perspectives, and discussions we've encountered here 🌎🙏

✍️ A Hidden Harmonic Oscillator in the 2D Hydrogen Atom The 2D hydrogen atom can be solved in an unexpected way: by mapping it to a 2D harmonic oscillator via a clever coordinate transformation. 🔗 quantphys.com/post/a-hidden-…

New year, new resolution 🚀 Know basic calculus and curious about quantum mechanics? Try our completely free intro course: Quantum Mechanics: Elementary Concepts 🎥 YouTube playlist: youtube.com/playlist?list=PL… ✍️ Videos + solved exercises: quantphys.com/lessons/qm1

Happy New Year! No matter how hectic it gets, don't forget to pause and reflect 🙂

🎞️ Visualizing a Quantum Particle in a Box See the wave function come to life as a 3D curve 🔗 youtu.be/xgqpmRwTfF4

🌀 Quantum Harmonic Oscillator with a Time-Dependent Frequency ⚛️ The harmonic oscillator is a cornerstone model in physics -- simple, solvable, and deeply insightful. Even when its frequency changes with time (for example, in ion traps with dynamic electric fields), it can often be treated analytically. Here, we explore an exactly solvable case of the quantum harmonic oscillator with a time-dependent frequency 👉 quantphys.com/post/quantum-h…

New video! 🎥 Do wave functions really have to vanish at infinity? ⚛️✉️ We explore a fascinating example: a wave function that is continuous, differentiable, and normalizable, yet unbounded at infinity. Watch here 👉 youtu.be/t8x4Kw11c80

🌀 The Wigner function is a quasi-probability distribution in phase space that lets us analyze quantum states and observables with classical-like intuition. ✍️ Here’s a concise overview of its key features: States: quantphys.com/post/wigner-s-… Observables: quantphys.com/post/wigner-s-…

📚 Quantum Mechanics by David Tong doi.org/10.1017/978100959480…

How observing a quantum system can freeze its evolution: the Quantum Zeno effect ⚛️❄️ youtu.be/lgYDb7gKhKM