Sunday physics: in QCD, “topology” refers to the structure of the vacuum (sectors, instantons, θ‑vacua, confinement). In quantum computing, “topology” is engineering: qubit geometry + stabilizers (toric/surface codes) to protect information via local syndromes. And within QCD, instantons and θ‑vacua are like two kids: both matter; which one would you start with to explain it? #QCD #QuantumComputing