References & Citations
Quantum Physics
Title: Coherent spin dynamics of rare-earth doped crystals in the high-cooperativity regime
(Submitted on 8 Jun 2022 (v1), last revised 20 Jun 2022 (this version, v2))
Abstract: Rare-earth doped crystals have long coherence times and the potential to provide quantum interfaces between microwave and optical photons. Such applications benefit from a high cooperativity between the spin ensemble and a microwave cavity -- this motivates an increase in the rare earth ion concentration which in turn impacts the spin coherence lifetime. We measure spin dynamics of two rare-earth spin species, $^{145}$Nd and Yb doped into Y$_{2}$SiO$_{5}$, coupled to a planar microwave resonator in the high cooperativity regime, in the temperature range 1.2 K to 14 mK. We identify relevant decoherence mechanisms including instantaneous diffusion arising from resonant spins and temperature-dependent spectral diffusion from impurity electron and nuclear spins in the environment. We explore two methods to mitigate the effects of spectral diffusion in the Yb system in the low-temperature limit, first, using magnetic fields of up to 1 T to suppress impurity spin dynamics and, second, using transitions with low effective g-factors to reduce sensitivity to such dynamics. Finally, we demonstrate how the `clock transition' present in the $^{171}$Yb system at zero field can be used to increase coherence times up to $T_{2} = 6(1)$ ms.
Submission history
From: Joseph Alexander [view email][v1] Wed, 8 Jun 2022 17:36:59 GMT (3796kb,D)
[v2] Mon, 20 Jun 2022 09:21:06 GMT (3804kb,D)
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