Polarisation-insensitive state preparation for trapped-ion hyperfine qubits
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2024
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| author | Leu, A. D. Smith, M. C. Gely, M. F. Lucas, D. M. |
| author_facet | Leu, A. D. Smith, M. C. Gely, M. F. Lucas, D. M. |
| contents | 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 ($σ^+$/$σ^-$) light, using $^{43}$Ca$^+$ at 28.8 mT. We find that the fidelity remains above $99.8\%$ for a mixture of all polarisations ($σ^+$/$σ^-$/$π$). 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$^\text{+}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14448 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Polarisation-insensitive state preparation for trapped-ion hyperfine qubits Leu, A. D. Smith, M. C. Gely, M. F. Lucas, D. M. Quantum Physics 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 ($σ^+$/$σ^-$) light, using $^{43}$Ca$^+$ at 28.8 mT. We find that the fidelity remains above $99.8\%$ for a mixture of all polarisations ($σ^+$/$σ^-$/$π$). 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$^\text{+}$. |
| title | Polarisation-insensitive state preparation for trapped-ion hyperfine qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.14448 |