Amazing stuff!
"Skyrmions are localized, particle-like excitations in materials that retain their structure due to topological constraints (i.e., restrictions arising from properties that remain unchanged under smooth deformations). These quasiparticles, first introduced in high-energy physics and quantum field theory, have since attracted intense interest in condensed matter physics and photonics, owing to their potential as robust carriers for information storage and manipulation. ...
Researchers ... recently reported the first experimental realization of single-photon quantum skyrmions (i.e., localized light structures) in a semiconductor cavity quantum electrodynamics (QED) system. ...
The main objective of this recent study ... was to realize quantum skyrmions using a deterministically coupled quantum dot-based microcavity system. In addition, the team wished to explore the topological properties of these quasiparticles and assess their robustness against perturbations. ..."
From the abstract:
"Skyrmions are topologically stable quasiparticles that have been investigated in contexts including particle physics, quantum field theory, acoustics and condensed-matter physics.
Quantum optical skyrmions with local topological textures are expected to reshape the landscape of quantum photonic technology, although their experimental implementation has not yet been demonstrated.
Here we present experimental realizations of nanophotonic quantum skyrmions using a semiconductor cavity quantum electrodynamics system. By manipulating the photonic spin–orbit coupling in a Gaussian microcavity, we obtained a confined optical mode whose polarizations feature skyrmionic topologies. With pronounced cavity quantum electrodynamics effects, we generated and detected single-photon skyrmions from a solid-state quantum emitter deterministically coupled to the Gaussian microcavity.
The polarity associated with single-photon skyrmions can be swapped by flipping the polarization of the quantum emitter through the Zeeman effect.
We also investigated the topological protection of quantum optical skyrmions under different perturbations.
Our work opens an unexplored aspect of quantum light–matter interactions in the nanoscale and might advance resilient photonic quantum technology with high-dimensional qubits and high-capacity quantum memories."
Nanophotonic quantum skyrmions enabled by semiconductor cavity quantum electrodynamics (no public access)
Single-photon skyrmions emitted from a QD coupled to a Gaussian microcavity.
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