Single-qubit remote manipulation by magnetic solitons

•Proposal for the remote control of qubits coupled to a spin chain supporting solitons.•Traveling solitons can be generated on the chain by acting far from the qubit.•Suitable magnetic solitons can properly change the qubit state.•This qubit manipulation mechanism is shown to be resilient to thermal noise.

Magnetic solitons can constitute a means for manipulating qubits from a distance. This would overcome the necessity of directly applying selective magnetic fields, which is unfeasible in the case of a matrix of qubits embedded in a solid-state quantum device. If the latter contained one-dimensional Heisenberg spin chains coupled to each qubit, one can originate a soliton in a selected chain by applying a time-dependent field at one end of it, far from the qubits. The generation of realistic solitons has been simulated. When a suitable soliton passes by, the coupled qubit undergoes nontrivial operations, even in the presence of moderate thermal noise.