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

• Published in: Journal of physics communications Vol. 6; no. 7; pp. 75007 - 75020
• Main Authors: Switzer, E D, Zhang, X-G, Rahman, T S
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01-07-2022
• Subjects: DJ resonance; exchange interaction; magnetic anisotropy; quantum entanglement
• ISSN: 2399-6528; 2399-6528
• DOI: 10.1088/2399-6528/ac7e1d

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.