Processing Quantum Information in Hybrid Topological Qubit and Superconducting Flux Qubit System

TL;DR

This paper proposes a hybrid quantum system combining Majorana-based topological qubits with superconducting flux qubits, enabling controlled operations, information transfer, and entanglement for quantum computing.

Contribution

It introduces a controllable coupling mechanism, a scheme for information transfer via Landau-Zener transition, and a structure for retrieving topological qubit information, advancing hybrid quantum computing.

Findings

Electrical control of qubit coupling demonstrated

Scheme for topological-to-flux qubit information transfer proposed

Entanglement of two topological qubits achieved

Abstract

A composite system of Majorana-hosted semiconductor nanowire and superconducting flux qubit is inves- tigated. It is found that the coupling between these two subsystems can be controlled electrically, supplying a convenient method to implement {\pi}/8 phase gate of a Majorana-based topological qubit. We also present a scheme to transfer information from the flux qubit to the topological qubit using Landau-Zener transition. In addition, a structure named top-flux-flux is proposed to retrieve the information stored in the topological qubit. With the demonstration of the entanglement of two topological qubits, it is very promising to do quantum information process with this hybrid system.