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Quantum 2.0 Conference and Exhibition

Photon scattering rates in trapped ion qubits

A. D. Quinn, I. D. Moore, Wesley C. Campbell, Eric R. Hudson, S. Brudney, Andrew Lesak, Jeremy Metzner, David J. Wineland, D. T. C. Allcock

Published Jan 1, 2022• 0 citations
Publisher

Abstract

We describe a new model for two-photon stimulated Raman transitions and our efforts to test this model in 40Ca+ions. Compared to previous models, our model predicts lower scattering at certain Raman beam detunings.
DOI
10.1364/quantum.2022.qw3a.5

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Spontaneous Raman scattering from metastable states of Ba+^++
Quantum logic gates performed via two-photon stimulated-Raman transitions in ions and atoms are fundamentally limited by spontaneous scattering errors. Recent theoretical treatment of these scattering processes has predicted no lower bound on the error rate of such gates when implemented with far-detuned lasers, while also providing an extension to metastable qubits. To validate this theoretical model, we provide experimental measurements of Raman scattering rates due to near-, and far-detuned lasers for initial states in the metastable D5/2_{5/2}5/2​ level of 137^{137}137Ba+^++. The measured spontaneous Raman scattering rate is consistent with the theoretical prediction and suggests that metastable-level two-qubit gates with an error rate ≈10−4\approx10^{-4}≈10−4 are possible with laser excitation detuned by tens of terahertz or more.