C4 – Quantum Information & Channels (CPTP)
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In https://pmc.ncbi.nlm.nih.gov/articles/PMC12315985/ (Wang et al., Science Advances, 2025), it is claimed that a Bell inequality is violated in a four-photon interference setup, even though the photons involved are not described as entangled within the system. The report names quantum indistinguishability via path identity as the mechanism and uses postselection on four-fold coincidences; the Bell parameter…
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Where Does the Quantum World End? An Operational FBA View on Nanoparticle Interference (MUSCLE)
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5 min read
In 2026, a Vienna team demonstrated quantum interference of sodium nanoparticles with more than 7,000 atoms (masses >170,000 Da) in the MUSCLE interferometer—setting a new size record for matter-wave interference. “Where does the quantum world end?” can thus be sharpened experimentally: How large may an object become, and how “classical” may its environment be, before…
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In https://arxiv.org/abs/2506.01476 (preprint, 2025), Guo et al. extract an EWS time delay τEWS for quantum transitions via spin- and angle-resolved photoemission and report strongly material-dependent attosecond scales (among others ~150 as in 1T-TiSe2/1T-TiTe2, >200 as in CuTe, 26 as in Cu). The central finding is that the measured timescale covaries with the (effective) symmetry and dimensionality of the electronic structure.…
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The WinFuture article popularizes an optics result whose primary source is Yessenov et al. (arXiv 2025; Optica 2026): a direct observation of a spatially structured Montgomery effect (lensless self-imaging) that generalizes the Talbot effect to aperiodic structures and is claimed to show repeated strongly focused spots (~10 µm) in free space. According to the abstract, a dynamic…
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In https://arxiv.org/abs/2510.13124 (Ghalekohneh & Zhao, preprint 2025), a decomposition of non-reciprocal, far-field radiative heat transfer in multi-body emitter networks is described: the heat current is split into an equilibrium contribution with persistent internal circulation and a non-equilibrium contribution for exchange with the environment; the latter is claimed to be engineerable such that “perfect” thermal rectification…
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Starting point is https://www.fr.de/wissen/wie-ein-mysterioeser-neutrino-fund-drei-mysterien-der-physik-loesen-koennte-94157428.html (context); in https://arxiv.org/abs/2505.22722 (preprint, v2 2026), Baker et al. argue that a population of quasi-extremal primordial black holes with “dark U(1)” charge can make the PeV neutrino fluxes of KM3NeT (around 100 PeV) and IceCube (above 1 PeV) simultaneously compatible with gamma-background constraints and LHAASO non-observations—and may even constitute all of the dark…
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In https://arxiv.org/abs/2504.15495 (preprint; PRL 136 (2026) 057201), Morrell, Elliott & Grier show that two acoustically levitated EPS spheres can enter emergent active stationary states without periodic driving; in one regime, these states break spatiotemporal symmetry and form a continuous classical time crystal. The authors also provide data and analysis code as an OSF repository (https://dx.doi.org/10.17605/OSF.IO/SX7UG).…
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Z-Boson Tagging in Heavy-Ion Plasma: Operational Null Tests for “Liquid Primordial Matter”
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6 min read
The news item https://www.ingenieur.de/technik/fachbereiche/rekorde/urknall-im-labor-cern-experiment-zeigt-erstmals-fluessige-urmaterie/ can be traced back to the primary CMS Collaboration work in https://arxiv.org/abs/2507.09307 (preprint, 2025): there, Z-boson tagging correlations of soft charged hadrons in pseudorapidity and azimuth relative to the Z direction in PbPb collisions at 5.02 TeV per nucleon pair are evaluated for the first time, with a pp reference, focusing…