Peer-reviewed physics journal from the American Physical Society covering applied physics, including quantum devices and materials research.
Physicists in Basel and Paderborn used an optical cavity to make quantum-dot cascade photons 90% indistinguishable, up from 60%. The fix targets the timing correlations that have limited these on-demand sources, and brightness and entanglement performance have yet to be reported.
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University of Twente researchers built a SQUID sensor on a silicon pyramid tip that still works above 1 tesla, about 20,000 times Earth's field. Etching the tip from silicon could let labs make these sensors in batches instead of by hand.
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The Sorbonne and Geneva groups each built entangled-photon sources to run the same 2022 anonymous voting protocol, and each published in Physical Review Letters. Between them they counted twelve ballots.
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The design pairs a long-lived qubit with a strongly interacting one through a coupler the group built earlier, and the reported gains in speed and fidelity come from simulation rather than from a fabricated chip.
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Thin films dump their heat into the substrate, which is why the thermal half of resistive switching stayed hidden. A Tokyo University of Science team hung an organic crystal in helium gas instead and measured its insides.
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A US-German group read the electron and nuclear splittings of the same nitrogen-vacancy ensemble and combined them, cutting temperature-driven drift about tenfold at 1,000-second averaging, though the long-term floor still sits near 1e-8.
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A University of Minnesota team synthesized semiconductor-quality iron sulfide straight from Iron Range taconite, which puts the purity floor in the process rather than the mine.
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A University of Minnesota team made semiconductor-quality pyrite straight from unpurified Iron Range ore. That questions a standing cost assumption, but no device data is reported yet.
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