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Maximally entangled probe state used as the comparison baseline against which the searched probe delivered up to 0.698 dB better precision.
No evidence-backed relationships are recorded.
Physicists at Kyoto and Hiroshima universities built an optical circuit that identifies three-photon W states in one shot, with an averaged fidelity of 0.871. That clears the two-thirds benchmark comfortably, though only three photons have been tested so far.
Reality
University of Pennsylvania physicists entangled four qubits in a diamond defect within 14.8 microseconds, ten times faster than pairwise gates. Run at room temperature, the parallel gate was also more accurate than the step-by-step version.
Reality
Kyoto and Hiroshima University physicists built an optical circuit that identifies three-photon W states in a single measurement. If it scales, labs checking larger entangled states could skip tomography, whose data needs grow exponentially with photon number.
Reality
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.
Reality
A variational circuit searched a seven-qubit nuclear-spin sensor for the probe state that works in the noise it actually has, rather than the one theory prefers in a clean world.
Reality