Qubits based on merons in magnetic nanodisks

Abstract A meron is a classical topological soliton having half charge. It could be materialized in magnetic disk. However, it will become quantum mechanical object when its size of the order nanometers. Here, we propose to use nanoscale nanodisk as qubit, where up and down directions core spin are assigned qubit states $$\left\vert 0\right\rangle$$ 0 1\right\rangle$$ 1 . We first numerically show that with radius containing small 7 spins can stabilized ferromagnetic classically. Then, theoretically universal computation possible based on merons by explicitly constructing arbitrary phase-shift gate, Hadamard CNOT gate. They executed applying field or spin-polarized current. Our results may useful for implementation textures nanomagnets.