Nature Physics, Published online: 12 November 2026; doi:10.1038/s41567-026-03499-7
Quantum channels can be used to describe the evolution of quantum states, including both unitary evolution and measurement. Now the optimal number of uses needed to learn an unknown channel to any fixed accuracy has been found.
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- Optimal learning of quantum channels in diamond distance
- Altermagnetism in a new lightNature Physics, Published online: 11 November 2026; doi:10.1038/s41567-026-03532-9 Altermagnets host spin-split bands despite zero net magnetization. A photonic crystal now reproduces this symmetry-driven phenomenon using circular polarization as a spin analogue.
- The edge of the SunNature Physics, Published online: 09 November 2026; doi:10.1038/s41567-026-03515-w Defining the solar radius is not as easy as it might seem. José Vaquero tells us a story of eclipses, meridian lines, astronomical archives and space observations.
- Nobel neutrinosNature Physics, Published online: 09 November 2026; doi:10.1038/s41567-026-03543-6 The Nobel Prize in Physics 2026 has been awarded to Francis Halzen “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin”.
- The cost of easy answersNature Physics, Published online: 09 November 2026; doi:10.1038/s41567-026-03525-8 The cost of easy answers
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- Bound states in the continuum through quantum interference in ultracold atomic collisionsNature Physics, Published online: 09 November 2026; doi:10.1038/s41567-026-03519-6 Resonances in ultracold collisions couple to scattering states, causing interactions and loss. Now it is shown that the interference of Feshbach resonances creates a bound state in the continuum that decouples from elastic and inelastic scattering.
- Coherence enhancement through equilibration to near-zero optical temperaturesNature Physics, Published online: 06 November 2026; doi:10.1038/s41567-026-03520-z Phase-space conservation bars coherence enhancement in passive linear optics, a limit often bypassed by gain or feedback. Here conservative nonlinearity reshapes phase space, thermodynamically driving incoherent light towards a coherent equilibrium.
