  We theoretically investigate a topological Kitaev chain connected to a double
quantum-dot (QD) setup hybridized with metallic leads. In this system we
observe the emergence of two striking phenomena: (i) a decrypted Majorana
fermion (MF) qubit recorded over a single QD, which is detectable by means of
conductance measurements due to the asymmetrical MF-qubit leaked state into the
QDs; (ii) an encrypted qubit recorded in both QDs when the leakage is
symmetrical. In such a regime, we have a cryptographylike manifestation, since
the MF qubit becomes bound states in the continuum, which is not detectable in
conductance experiments.
