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.