Error correction of a logical qubit encoded in a single atomic ion
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917959462551552 |
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| author | DeBry, Kyle Meister, Nadine Martinez, Agustin Valdes Bruzewicz, Colin D. Shi, Xiaoyang Reens, David McConnell, Robert Chuang, Isaac L. Chiaverini, John |
| author_facet | DeBry, Kyle Meister, Nadine Martinez, Agustin Valdes Bruzewicz, Colin D. Shi, Xiaoyang Reens, David McConnell, Robert Chuang, Isaac L. Chiaverini, John |
| contents | Quantum error correction (QEC) is essential for quantum computers to perform useful algorithms, but large-scale fault-tolerant computation remains out of reach due to demanding requirements on operation fidelity and the number of controllable quantum bits (qubits). Traditional QEC schemes involve encoding each logical qubit into multiple physical qubits, requiring a significant overhead in resources and complexity. Recent theoretical work has proposed a complementary approach of performing error correction at the single-particle level by taking advantage of additional available quantum states, potentially reducing QEC overhead. However, this approach has not been demonstrated experimentally, due in part to the difficulty of performing error measurements and subsequent error correction with high fidelity. Here we demonstrate QEC in a single atomic ion that decreases errors by a factor of up to 2.2 and extends the qubit's useful lifetime by a factor of up to 1.5 compared to an unencoded qubit. The qubit is encoded in spin-cat logical states, and we develop a scheme for autonomous error correction that does not require mid-circuit measurements of an ancilla. Our work is applicable to a wide variety of finite-dimensional quantum systems, and such encodings may prove useful either as components of larger QEC codes, or when used alone in few-qubit devices, such as quantum network nodes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13908 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Error correction of a logical qubit encoded in a single atomic ion DeBry, Kyle Meister, Nadine Martinez, Agustin Valdes Bruzewicz, Colin D. Shi, Xiaoyang Reens, David McConnell, Robert Chuang, Isaac L. Chiaverini, John Quantum Physics Atomic Physics Quantum error correction (QEC) is essential for quantum computers to perform useful algorithms, but large-scale fault-tolerant computation remains out of reach due to demanding requirements on operation fidelity and the number of controllable quantum bits (qubits). Traditional QEC schemes involve encoding each logical qubit into multiple physical qubits, requiring a significant overhead in resources and complexity. Recent theoretical work has proposed a complementary approach of performing error correction at the single-particle level by taking advantage of additional available quantum states, potentially reducing QEC overhead. However, this approach has not been demonstrated experimentally, due in part to the difficulty of performing error measurements and subsequent error correction with high fidelity. Here we demonstrate QEC in a single atomic ion that decreases errors by a factor of up to 2.2 and extends the qubit's useful lifetime by a factor of up to 1.5 compared to an unencoded qubit. The qubit is encoded in spin-cat logical states, and we develop a scheme for autonomous error correction that does not require mid-circuit measurements of an ancilla. Our work is applicable to a wide variety of finite-dimensional quantum systems, and such encodings may prove useful either as components of larger QEC codes, or when used alone in few-qubit devices, such as quantum network nodes. |
| title | Error correction of a logical qubit encoded in a single atomic ion |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2503.13908 |