2 - Closed loop
Résumé
A closed loop can be obtained by linear superposition of the two free ends of an open loop. Its main property is the double degeneracy of its states. The analytical expressions of its eigenvalues, eigenfunctions, and response function are presented. The case of two simultaneous identical measures at two different points of a closed loop is briefly addressed. The simultaneous activation of these two degenerate states is presented from the theoretical and experimental points of view.