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We propose a theoretical approach based on an interferometer composed by twoquantum dots asymmetrically coupled to isolated Majorana quasiparticles (MQPs),lying on the edges of two topological Kitaev chains, respectively via couplings$(t+\Delta)$ and $(\Delta-t)$. This setup enables us to probe MQPs in a quitedistinct way from the zero-bias peak feature. Most importantly, the systembehaves as a current switch made by two distinct paths: (i) for the upper dotconnected to both chains, the device perceives both MQPs as an ordinary fermionand the current crosses solely the lower dot, since current in the upper dot isprevented due to the presence of the superconducting gap; and (ii) bysuppressing slightly the hybridization of the upper dot with one chain, thecurrent is abruptly switched to flow through this dot, once a trapped electronas a bound state in the continuum (BIC) (Phys. Rev. B 93, 165116 (2016))appears in the lower dot. Such a current switch between upper and lower dotscharacterizes the Quantum Phase Transition (QPT) proposed here, being the ratio$t/\Delta$ the control parameter of the transition. This QPT is associated witha change from an ordinary fermionic excitation regime to a MQP in theinterferometer, which enables not only the fundamental revealing of MQPs, butalso yields a current switch assisted by them.

Unveiling Majorana Quasiparticles by a Quantum Phase Transition: Proposal of a Current Switch