Skyrmionic topology emerges directly in the density matrix of mixed quantum states of light, including in reduced subspaces of entangled photon pairs, and persists under noise.
M.et al.Topologically pro- tected optical polarization singularities in four-dimensional space.Science Advances9, eadh0369 (2023)
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Quantum Skyrmions in Mixed States of Light and their Nested Topology
Skyrmionic topology emerges directly in the density matrix of mixed quantum states of light, including in reduced subspaces of entangled photon pairs, and persists under noise.