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A trijunction made of three topological semiconducting wires, each supporting a Majorana bound state (MBS) at its two extremities, appears as one of the simplest geometries in order to perform braiding of Majorana fermions. Embedding the trijunction into a microwave cavity allows to study the intricate dynamics of the low‐energy MBSs coupled to the cavity electric field under a braiding operation. Extending a previous work [ Phys. Rev. Lett .  2019 ,  122 , 236803], the full time evolution of the density matrix of the low‐energy states, including various relaxation channels, is computed both in the adiabatic regime, as well as within the Floquet formalism in the case of periodic driving. It turns out that in the stationary state the observables of the system depend on both the parity of the ground state and on the non‐Abelian Berry phase acquired during braiding. The average photon number and the second‐order photon coherence function  g  (2) (0) are explicitly evaluated and reveal the accumulated non‐Abelian Berry phase during the braiding process.

Dynamics of a Majorana Trijunction in a Microwave Cavity