A quantum pattern that refuses to die: it outlasted the entanglement that created it

Quantum information is fragile — disturb it, and the delicate link called entanglement snaps. Engineers at the University of Pennsylvania tried protecting it with topology, the maths that treats a doughnut and a coffee mug as the same shape because both have one hole that survives any squashing. They engraved a swirling pattern called a skyrmion onto one photon of an entangled pair, and found the pattern could be transferred to the pair's shared state — and, remarkably, it stayed intact even after they introduced enough disruption to destroy the entanglement itself. The work is published in Nature Physics.

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