Fig. 2: Topological protection of quantum resources.
From: Quantum topological photonics with special focus on waveguide systems
a Topological protection of biphoton states65. b Topological protection of path entanglement62. c Topological protection of continuous frequency entangled biphoton states72. d Topological protection of two-photon states against the decoherence in diffusion63. e Anderson localization of entangled photons in an integrated quantum walk66. f Topological light–matter interface75. Panels adapted with permission from refs. 62,63,65,66,72,75.
