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Motivated by a recent experiment [Nadj-Perge et al., Science 346, 602 (2014)]providing evidence for Majorana zero modes in iron chains on thesuperconducting Pb surface, in the present work, we theoretically propose anall-optical scheme to detect Majorana fermions, which is very different fromthe current tunneling measurement based on electrical means. The opticaldetection proposal consists of a quantum dot embedded in a nanomechanicalresonator with optical pump-probe technology. With the optical means, thesignal in the coherent optical spectrum presents a distinct signature for theexistence of Majorana fermions in the end of iron chains. Further, thevibration of the nanomechanical resonator behaving as a phonon cavity willenhance the exciton resonance spectrum, which makes the Majorana fermions moresensitive to be detectable. This optical scheme affords a potential supplementfor detection of Majorana fermions and supports to use Majorana fermions in Fechains as qubits for potential applications in quantum computing devices.

Robust Majorana signature detection with a coupled quantum dot-nanomechanical resonator in all-optical domain