Encrypting Majorana Fermions-qubits as Bound States in the Continuum

• Main Authors: Guessi, L. H, Dessotti, F. A, Marques, Y, Ricco, L. S, Pereira, G. M, Menegasso, P, de Souza, M, Seridonio, A. C
• Format: Journal Article
• Language: English
• Published: 18-07-2017
• Subjects: Physics - Mesoscale and Nanoscale Physics
• DOI: 10.48550/arxiv.1703.10226

Phys. Rev. B 96, 041114 (2017) 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.