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arXiv · 2406.14448

Polarisation-insensitive state preparation for trapped-ion hyperfine qubits

A. D. Leu·M. C. Smith·M. F. Gely·D. M. Lucas
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Abstract

Quantum state preparation for trapped-ion qubits often relies on high-quality circularly-polarised light, which may be difficult to achieve with chip-based integrated optics technology. We propose and implement a hybrid optical/microwave scheme for intermediate-field hyperfine qubits which instead relies on frequency selectivity. Experimentally, we achieve $99.94\%$ fidelity for linearly-polarised ($\sigma^+$/$\sigma^-$) light, using $^{43}$Ca$^+$ at 28.8 mT. We find that the fidelity remains above $99.8\%$ for a mixture of all polarisations ($\sigma^+$/$\sigma^-$/$\pi$). We calculate that the method is capable of $99.99\%$ fidelity in $^{43}$Ca$^+$, and even higher fidelities in heavier ions such as $^\text{137}$Ba$^\text{+}$.

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A. D. Leu, M. C. Smith, M. F. Gely, D. M. Lucas. 2024-06-20. Polarisation-insensitive state preparation for trapped-ion hyperfine qubits. https://doi.org/10.1103/physreva.110.l040402

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