Real-time magnetic field noise correction using trapped-ion monitor qubits
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arXiv
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| Format: | Preprint |
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2025
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| author | DeBry, Kyle Valdes-Martinez, Agustin Reens, David Bruzewicz, Colin D. Chiaverini, John |
| author_facet | DeBry, Kyle Valdes-Martinez, Agustin Reens, David Bruzewicz, Colin D. Chiaverini, John |
| contents | We demonstrate a trapped-ion protocol in which a nearby, dedicated "monitor" qubit tracks magnetic-field drifts in real time without interrupting data-qubit operations. Using two $^{40}\mathrm{Ca}^+$ ions and the optical--metastable--ground architecture, we encode the data qubit in the ground-state manifold and the monitor qubit in a metastable-state manifold to achieve spectral separation. The monitor qubit senses common magnetic fluctuations during data-qubit experiments, enabling feedforward corrections to the qubit-control drives. Under applied magnetic noise with a realistic spectrum ($1/f^{2}$), the protocol maintains coherence and, when compared with interleaved calibration, it extends usable data-qubit probe times by up to a factor of ${\sim}\sqrt{2}$ and doubles the experimental duty cycle. These results establish monitor qubits as a scalable tool for real-time recalibration in quantum information processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04767 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-time magnetic field noise correction using trapped-ion monitor qubits DeBry, Kyle Valdes-Martinez, Agustin Reens, David Bruzewicz, Colin D. Chiaverini, John Quantum Physics Atomic Physics We demonstrate a trapped-ion protocol in which a nearby, dedicated "monitor" qubit tracks magnetic-field drifts in real time without interrupting data-qubit operations. Using two $^{40}\mathrm{Ca}^+$ ions and the optical--metastable--ground architecture, we encode the data qubit in the ground-state manifold and the monitor qubit in a metastable-state manifold to achieve spectral separation. The monitor qubit senses common magnetic fluctuations during data-qubit experiments, enabling feedforward corrections to the qubit-control drives. Under applied magnetic noise with a realistic spectrum ($1/f^{2}$), the protocol maintains coherence and, when compared with interleaved calibration, it extends usable data-qubit probe times by up to a factor of ${\sim}\sqrt{2}$ and doubles the experimental duty cycle. These results establish monitor qubits as a scalable tool for real-time recalibration in quantum information processors. |
| title | Real-time magnetic field noise correction using trapped-ion monitor qubits |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2511.04767 |