Enhancing spin-photon coupling with a micromagnet

Vacuum Rabi Splitting and Kerr Effect of a Hybrid Spin–Magnon–Photon System

“…The magnon and the NV center are coupled with coupling strength g by magnetic dipole interaction. [ 51 ] Therefore, the NV center–magnon coupling Hamiltonian can be represented as $$g( {{\sigma }^\dag m + {\sigma }^ - {m}^\dag } )$$. At the same time, the NV center is driven by a strong pump field with amplitude $${E}_p$$ and a weak probe field with amplitude $${E}_s$$.…”

“…[ 53 ] Compared to the previous works in refs. [51, 54, 55] the distinct feature of the present scheme is that the Mollow triplet and vacuum Rabi splitting can be observed by controlling the spin–magnon coupling g and the magnon–photon coupling λ. Second, the probe absorption spectrum is greatly influenced by the spin‐pump field detuning $${\Delta }_p$$.…”

“…[50] A simple technique to strongly couple a single solid-state spin to the microwave photons in a superconducting coplanar waveguide (CPW) cavity via a magnetic microsphere was presented. [51] Motivated by these developments, we propose a hybrid spin-magnon-photon system to investigate the vacuum Rabi splitting and Kerr effect. The strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator has been demonstrated experimentally.…”

Enhanced spin-mechanical interaction with levitated micromagnets

“…Because of their isolation, they have been used to con- * lipengbo@mail.xjtu.edu.cn struct ultra-sensitive sensors [42,43] as well as to couple superconducting circuits [48] and solid-state spins [15,34,64]. Magnetic microspheres, particularly YIG (yttrium iron garnet) spheres due to their high spin density [68], have received a great attention [69][70][71][72][73][74][75][76][77]. There have been investigations on magnon coupling to cavity modes such as a sphere cavity [72], co-axis cavity [73], 3D cavity [74], and so on.…”

“…Classical Rabilike oscillation [75], magnetically induced transparency [75], bistable states [76], and other intriguing quantum effects have been observed. Furthermore, the YIG sphere can couple to microwave photons and solid-state spins, which has been utilized to improve the coupling strength between a solid-state spin and a photon mode [77]. In addition, the levitated micromagnets coupled to solid-state spins have been studied [51].…”