Papers › Microwave spectroscopy and multi-channel quantum defect analysis of ytterbium Rydberg states
Microwave spectroscopy and multi-channel quantum defect analysis of ytterbium Rydberg states
Rin Kuroda, Vernon M. Hughes, Martin Poitrinal, Michael Peper, Jeff D. Thompson
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The complex Rydberg structure of ytterbium atoms is shaped by multiple low-lying ion-core-excited states and strong channel interactions, which presents both opportunities and challenges for quantum information processing and precision metrology. In this work, we extend high-resolution microwave spectroscopy and multichannel quantum defect theory (MQDT) modeling of singly excited 6snℓ Rydberg states in ¹⁷⁴Yb and ¹⁷¹Yb to include the ℓ= 3 (f) and ℓ= 4 (g) series. Our measurements reveal p-f mixing in odd-parity Rydberg states of ¹⁷¹Yb, which we incorporate by combined MQDT models for 6snp and 6snf series. Additionally, we observe that for ℓ= 4 the spin-orbit interaction dominates over the exchange interaction, such that the 6sng states are more accurately described in a jj-coupled basis. We validate our models by comparing the predicted Land\'e g-factors and static dipole polarizabilities with experimental measurements, finding excellent agreement. These results provide important input for designing high-fidelity entangling gates with ytterbium atoms.
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