quantum-physics

Starting from the Lagrangian density of the electromagnetic field:$$\mathcal{L}=-\frac{1}{4}F^{\mu\nu}F_{\mu\nu}-J_\mu A^\mu.$$ We demand that the lagrangian is invariant under a gauge transformation ...

AI could accelerate the hunt for new physics, but sometimes it knows too much to see what’s right in front of it. Artificial intelligence could make it much cheaper and faster to search for new laws of physics, according to a new study published in the Journal of Cosmology and Astroparticle Physics (JCAP). But the [...]

This web exhibit from the American Institute of Physics dives into the life of the founder of quantum mechanics and the uncertainty principle.

News tidbits from here and there, or here/there, and/or there/here, as the case may be. Major Turing computing award goes to quantum science for first time - Nature March 18 " This is the first time that the Turing Award has recognized work related to quantum physics. Bennett and Brassard — partly through joint work — began to investigate the power of phenomena that could go beyond what’s possibl…

US Army scientists have demonstrated a new quantum sensor that can measure the full 3D direction of radio-frequency electromagnetic fields, a milestone that could reshape how signals are detected on the battlefield. The breakthrough was achieved by scientists at the U.S. Army Combat Capabilities Development Command, known as DEVCOM, Army Research Laboratory. According to the […]

Using light to perform tasks beyond the reach of classical computers.

Nature Physics, Published online: 12 June 2026; doi:10.1038/s41567-026-03309-0 Qubits with detectable erasure errors can support more efficient error correction than qubits with unlocated errors. Improved logical qubit performance using erasure conversion has now been demonstrated using ytterbium-171 atoms.

Nature Physics, Published online: 12 June 2026; doi:10.1038/s41567-026-03258-8 Ytterbium-171 atoms can store quantum information in different ways, with their own applications and advantages. Now the ability to coherently transfer entangled states between these different qubit types has been demonstrated.

A research team in Bochum, Germany has unexpectedly found that light can slow down movements in the nanoworld. This is due to quantum friction, a phenomenon that has been poorly understood until now. The findings are published in the journal Nature. Light is expected to heat particles up or set them in motion. However, the […]

Scientists at RIKEN have proposed a new way to make quantum systems synchronize in only one direction—like a one-way street for sound particles known as phonons. The breakthrough combines two quantum effects to create a form of one-way quantum synchronization that remains surprisingly stable even when exposed to manufacturing flaws and environmental noise, two major […]

On the NSR superstring: On cosmic inflation in supergravity: On the history of the concept of supersymmetry: On historical work by Yoichiro Nambu on the Ising model:

Sylvester James Gates Jr., known as Jim Gates, works on supersymmetry, supergravity and superstring theory. Formulating supergravity in superspace: Warren Siegel, S. James Gates Jr., Superfield supergravity, Nuclear Physics B 147 1–2 (1979) 77-104 [doi:10.1016/0550-3213(79)90416-4] S. James Gates Jr., Kellogg S. Stelle, Peter C. West Algebraic origins of superspace constraints in supergravity, Nu…

This page compiles pointers to material contained in the book collection: Cosimo Bambi, Leonardo Modesto, Ilya L. Shapiro (eds.): Springer (2025) on aspects of quantum gravity. Contents: for the time being in no particular order On perturbative quantum gravity: Viewed as an effective quantum field theory: On gauge invariant renormalization of perturbative quantum gravity: On renormalization of pe…

A mathematical model shows that attempting to sever a fundamental particle of light could conjure new ones out of thin air.

I wanted to have a quick check on how Bell's theorem was formulated so consulted the wiki page: https://en.wikipedia.org/wiki/Bell's_theorem But then saw the following odd section: ===== Hypothetical characters Alice and Bob stand in widely separated locations. Their... Read more

Quantum 10, 2134 (2026). https://doi.org/10.22331/q-2026-06-12-2134 Building upon $\textit{Wan, Zhong (2025)}$ [ 5 ] we present a few methods on how to simulate the non-Clifford $d=5$ magic state cultivation circuits[ 4 ] with a sum of $\approx 8$ Clifford ZX-diagrams on average, at $0.1\%$ noise. Compared to a magic cat state stabiliser decomposition of all $53$ non-Clifford spiders ($6{,}377{,}…

Quantum 10, 2133 (2026). https://doi.org/10.22331/q-2026-06-12-2133 Recent advances in analog and digital quantum-simulation platforms have enabled exploration of the spectrum of entanglement Hamiltonians via variational algorithms. In this work we analyze the convergence properties of the variationally obtained solutions and compare them to numerically exact calculations in quantum critical syst…

Quantum 10, 2132 (2026). https://doi.org/10.22331/q-2026-06-12-2132 Quantum linear optics without post-selection is not powerful enough to produce any quantum state from a given input state. This limits its utility since some applications require entangled resources that are difficult to prepare. Thus, a deeper understanding of linear optical state preparation is needed. In this work, we give a r…

Nature Communications, Published online: 12 June 2026; doi:10.1038/s41467-026-74332-1 Despite substantial literature on the quantum Zeno effect, some issues such as the role of finite measurement durations are not well understood. Here, the authors demonstrate quantum Zeno dynamics in the motional states of a single trapped atom, advancing measurement-based control schemes.

Physics is considered a cold, hard science – but it will transform your life if you view it with a bit more subjectivity, says Karmela Padavic-Callaghan By Karmela Padavic-Callaghan