Enhancing coherent coupling between single magnon and quantum spin defects via parametric driving

Realizing strong coherent interactions between quantum spin defects (QSD) and the collective spin excitations in magnets at the single magnon level is challenging. Motivated by the developments in electrical control of magnetism in spintronic devices, we explore the use of voltage-controlled magnetic anisotropy (VCMA) as a technique for overcoming this challenge in nanomagnet-QSD hybrids. In particular, we discuss controlled electrical generation of squeezed magnons via detuned parametric driving and demonstrate theoretically increase in coupling strength between these magnons and QSDs. We also study reservoir engineering techniques suitable for magnonic systems to enable the attainment of improved cooperativity values.