Polarisation-insensitive state preparation for trapped-ion hyperfine qubits

• URL: http://arxiv.org/abs/2406.14448v1
• Date: Thu, 20 Jun 2024 16:11:37 GMT
• Title: Polarisation-insensitive state preparation for trapped-ion hyperfine qubits
• Authors: A. D. Leu, M. C. Smith, M. F. Gely, D. M. Lucas,
• Abstract summary: Quantum state preparation for trapped-ion qubits often relies on high-quality circularly-polarised light. We propose and implement a hybrid optical/microwave scheme for intermediate-field hyperfine qubits. We find that the fidelity remains above $99.8%$ for a mixture of all polarisations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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