Electronic control and switching of entangled spin state using anisotropy and exchange in the three-particle paradigm

Abstract

Abstract We explore the control and switching of the entangled spin states of multi-spin particle qubit coupled to an electron using a three-particle spin model described by S i (i = 1, 2, 3), in which S 1 = 1 2 is an electron and S 2,3 can have any spin with both exchange coupling and magnetic anisotropy. We derive a general formula for the existence of a switching (DJ) resonance for any spin S 2,3. We further contrast the entanglement switching mechanisms for the S 2,3 = 1 2 and S 2,3 = 1 spin models. We find that while the onsite magnetic anisotropy in the case of S 2,3 > 1 2 allows full control of their spin states via interaction with S 1, in order to achieve acceptable control of a Bloch vector within the S 2,3 = 1 2 model, additional mechanisms, such as anisotropic exchange coupling, are required.