Related papers: Strong coupling of a Gd$^{3+}$ multilevel spin system to an on-chip superconducting resonator

Strong coupling of a Gd$^{3+}$ multilevel spin system to an on-chip superconducting resonator

URL: http://arxiv.org/abs/2210.05053v2
Date: Thu, 3 Nov 2022 01:25:30 GMT
Title: Strong coupling of a Gd$^{3+}$ multilevel spin system to an on-chip superconducting resonator
Authors: Giovanni Franco-Rivera, Josiah Cochran, Seiji Miyashita, Sylvain Bertaina and Irinel Chiorescu
Abstract summary: We report the realization of a strong coupling between a Gd$3+$ spin ensemble hosted in a scheelite (CaWO$_4$) single crystal. The interaction is well described by the Dicke model and the crystal-field Hamiltonian of the multilevel spin system.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We report the realization of a strong coupling between a Gd$^{3+}$ spin ensemble hosted in a scheelite (CaWO$_4$) single crystal and the resonant mode of a coplanar stripline superconducting cavity leading to a large separation of spin-photon states of 146 MHz. The interaction is well described by the Dicke model and the crystal-field Hamiltonian of the multilevel spin system. We observe a change of the crystal-field parameters due to the presence of photons in the cavity that generates a significant perturbation of the crystal ground state. Using finite-element calculations, we numerically estimate the cavity sensing volume as well as the average spin-photon coupling strength of $g_0\approx$ 620 Hz. Lastly, the dynamics of the spin-cavity states are explored via pulsed measurements by recording the cavity ring-down signal as a function of pulse length and amplitude. The results indicate a potential method to initialize this multilevel system in its ground state via an active cooling process.

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