Topological nonlocal operations on toroidal flux qubits

Abstract

We propose a conceptual model of a toroidal flux qubit, which consists of a quantized toroidal magnetic flux coupled to a charged particle on a quantum ring through field-free interaction. Scaling the system to two or more flux qubits results in emergent field-free coupling between them. We show that the topological and nonlocal aspects of this system can have profound applications in quantum information. We illustrate it with examples of nonlocal operations on these flux qubits which are protected from environmental noise, including creating entanglement and ``teleporting'' excitation energy between the flux qubits.