# Encrypting Majorana Fermions-qubits as Bound States in the Continuum

## TL;DR

This paper proposes a theoretical system where Majorana fermion qubits can be either decrypted or encrypted within quantum dots, with the encrypted state being undetectable via conductance, advancing quantum cryptography concepts.

## Contribution

It introduces a novel hybrid quantum-dot system that hosts Majorana fermion qubits as bound states in the continuum, enabling cryptographic-like quantum states.

## Key findings

- Decrypted Majorana qubit detectable via conductance.
- Encrypted qubit remains undetectable in conductance.
- System demonstrates cryptography-like quantum states.

## Abstract

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.