Related papers: Spectroscopy and modeling of $^{171}$Yb Rydberg states for high-fidelity two-qubit gates

Spectroscopy and modeling of $^{171}$Yb Rydberg states for high-fidelity two-qubit gates

URL: http://arxiv.org/abs/2406.01482v1
Date: Mon, 3 Jun 2024 16:08:33 GMT
Title: Spectroscopy and modeling of $^{171}$Yb Rydberg states for high-fidelity two-qubit gates
Authors: Michael Peper, Yiyi Li, Daniel Y. Knapp, Mila Bileska, Shuo Ma, Genyue Liu, Pai Peng, Bichen Zhang, Sebastian P. Horvath, Alex P. Burgers, Jeff D. Thompson,
Abstract summary: We present quantum defect (MQDT) models for highly excited $174$Yb and $171$Yb Rydberg states with $L leq 2$. The models are developed using a combination of existing literature data and new, high-precision laser and microwave spectroscopy in an atomic beam.
Score: 4.0764044074585515
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We present multichannel quantum defect (MQDT) models for highly excited $^{174}$Yb and $^{171}$Yb Rydberg states with $L \leq 2$. The models are developed using a combination of existing literature data and new, high-precision laser and microwave spectroscopy in an atomic beam, and validated by detailed comparison with experimentally measured Stark shifts and magnetic moments. We then use these models to compute interaction potentials between two Yb atoms, and find excellent agreement with direct measurements in an optical tweezer array. From the computed interaction potential, we identify an anomalous F\"orster resonance that likely degraded the fidelity of previous entangling gates in $^{171}$Yb using $F=3/2$ Rydberg states. We then identify a more suitable $F=1/2$ state, and achieve a state-of-the-art controlled-Z gate fidelity of $\mathcal{F}=0.994(1)$, with the remaining error fully explained by known sources. This work establishes a solid foundation for the continued development quantum computing, simulation and entanglement-enhanced metrology with Yb neutral atom arrays.

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