High-fidelity heralded quantum state preparation and measurement
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909309437214720 |
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| author | Sotirova, A. S. Leppard, J. D. Vazquez-Brennan, A. Decoppet, S. M. Pokorny, F. Malinowski, M. Ballance, C. J. |
| author_facet | Sotirova, A. S. Leppard, J. D. Vazquez-Brennan, A. Decoppet, S. M. Pokorny, F. Malinowski, M. Ballance, C. J. |
| contents | We present a novel protocol for high-fidelity qubit state preparation and measurement (SPAM) that combines standard SPAM methods with a series of in-sequence measurements to detect and remove errors. The protocol can be applied in any quantum system with a long-lived (metastable) level and a means to detect population outside of this level without coupling to it. We demonstrate the use of the protocol for three different qubit encodings in a single trapped $^{137}\mathrm{Ba}^+$ ion. For all three, we achieve the lowest reported SPAM infidelities of $7(4) \times 10^{-6}$ (optical qubit), $5(4) \times 10^{-6}$ (metastable-level qubit), and $8(4) \times 10^{-6}$ (ground-level qubit). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_05805 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-fidelity heralded quantum state preparation and measurement Sotirova, A. S. Leppard, J. D. Vazquez-Brennan, A. Decoppet, S. M. Pokorny, F. Malinowski, M. Ballance, C. J. Quantum Physics Atomic Physics We present a novel protocol for high-fidelity qubit state preparation and measurement (SPAM) that combines standard SPAM methods with a series of in-sequence measurements to detect and remove errors. The protocol can be applied in any quantum system with a long-lived (metastable) level and a means to detect population outside of this level without coupling to it. We demonstrate the use of the protocol for three different qubit encodings in a single trapped $^{137}\mathrm{Ba}^+$ ion. For all three, we achieve the lowest reported SPAM infidelities of $7(4) \times 10^{-6}$ (optical qubit), $5(4) \times 10^{-6}$ (metastable-level qubit), and $8(4) \times 10^{-6}$ (ground-level qubit). |
| title | High-fidelity heralded quantum state preparation and measurement |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2409.05805 |