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The quantum evolution after a metallic lead is suddenly connected to anelectron system contains information about the excitation spectrum of thecombined system. We exploit this type of "quantum quench" to probe the presenceof Majorana fermions at the ends of a topological superconducting wire. Weobtain an algebraically decaying overlap (Loschmidt echo) ${\cal L}(t)=| <\psi(0) | \psi(t) > |^2\sim t^{-\alpha}$ for large times after the quench, witha universal critical exponent $\alpha$=1/4 that is found to be remarkablyrobust against details of the setup, such as interactions in the normal lead,the existence of additional lead channels or the presence of bound levelsbetween the lead and the superconductor. As in recent quantum dot experiments,this exponent could be measured by optical absorption, offering a new signatureof Majorana zero modes that is distinct from interferometry and tunnelingspectroscopy.

Universal nonequilibrium signatures of Majorana zero modes in quench dynamics