Quantum graph
https://en.wikipedia.org/wiki/Quantum_graphQuantum graphs: Applications to quantum chaos anduniversal spectral statistics [2006 Review]
Experimental simulation of quantum graphs by microwave networks (showing GOE and GUE statistics if time-reversal symmetric or not) - Hul, 2004
Nonuniversality in the spectral properties of time-reversal-invariant microwavenetworks and quantum graphs - Dietz 2017
Perfect absorption in complex scattering systemswith or without hidden symmetries : demonstation of coherent perfect absorption (CPA) in microwave networks, with or without time-reversal symmetry (could be used for wireless power transfer)