Robust interface between flying and topological qubits

Abstract

Hybrid architectures, consisting of conventional and topological qubits, have recently attracted much attention due to their capability in consolidating the robustness of topological qubits and the universality of conventional qubits. However, these two kinds of qubits are normally constructed in significantly different energy scales, and thus this energy mismatch is a major obstacle for their coupling that supports the exchange of quantum information between them. Here, we propose a microwave photonic quantum bus for a direct strong coupling between the topological and conventional qubits, in which the energy mismatch is compensated by the external driving field via the fractional ac Josephson effect. In the framework of tight-binding simulation and perturbation theory, we show that the energy splitting of the topological qubits in a finite length nanowire is still robust against local perturbations, which is ensured not only by topology, but also by the particle-hole symmetry. Therefore, the present scheme realizes a robust interface between the flying and topological qubits. Finally, we demonstrate that this quantum bus can also be used to generate multipartitie entangled states with the topological qubits.

Accepted for publication in Scientific Reports

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Cited by in corpus (11)

• Topological order in the Kitaev/Majorana chain in the presence of disorder and interactions
• Quantum response theory for open systems and its application to Hall conductance
• Josephson effect in topological superconducting rings coupled to a microwave cavity
• Controllable high-fidelity quantum state transfer and entanglement generation in circuit QED
• Quantum Zeno and Zeno-like effects in nitrogen vacancy centers
• Topological phase, supercritical point and emergent phenomena in extended ${\mathbb{Z}}_3$ parafermion chain
• Quantum gates by periodic driving
• Entangled states of two quantum dots mediated by Majorana fermions
• Tunable interaction of superconducting flux qubits in circuit QED
• Detecting fractional Josephson effect through $4\pi$ phase slip
• Interferometric detection of Chern numbers in topological optical lattices