Gate Optimization via Efficient Two-Qubit Benchmarking for NV Centers in Diamond
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866911499219369984 |
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| author | Marcomini, Alessandro Vetter, Philipp J. Calarco, Tommaso Motzoi, Felix Jelezko, Fedor Müller, Matthias M. |
| author_facet | Marcomini, Alessandro Vetter, Philipp J. Calarco, Tommaso Motzoi, Felix Jelezko, Fedor Müller, Matthias M. |
| contents | High-fidelity gate implementation requires sophisticated control pulses that steer the quantum system to undergo the desired transformation. Quantum Optimal Control allows to derive these control pulses in an open-loop fashion based on numerical simulations. However, their precision can be limited by incomplete knowledge of the system. Closed-loop optimization overcomes this limitation by incorporating feedback from measurements, provided a suitable and efficient measure of the gate performance can be defined. In this article, we present an efficient method to evaluate the performance of a two-qubit gate by preparation and measurement of only two quantum states, enabling experimental closed-loop optimization with a metric previously believed to be limited to open-loop control. We tailor the approach to nitrogen-vacancy centers in diamond and, through numerical simulations, demonstrate how the method can optimize a two-qubit gate while reducing the number of required measurements by two orders of magnitude compared to standard process tomography under realistic experimental settings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08581 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gate Optimization via Efficient Two-Qubit Benchmarking for NV Centers in Diamond Marcomini, Alessandro Vetter, Philipp J. Calarco, Tommaso Motzoi, Felix Jelezko, Fedor Müller, Matthias M. Quantum Physics High-fidelity gate implementation requires sophisticated control pulses that steer the quantum system to undergo the desired transformation. Quantum Optimal Control allows to derive these control pulses in an open-loop fashion based on numerical simulations. However, their precision can be limited by incomplete knowledge of the system. Closed-loop optimization overcomes this limitation by incorporating feedback from measurements, provided a suitable and efficient measure of the gate performance can be defined. In this article, we present an efficient method to evaluate the performance of a two-qubit gate by preparation and measurement of only two quantum states, enabling experimental closed-loop optimization with a metric previously believed to be limited to open-loop control. We tailor the approach to nitrogen-vacancy centers in diamond and, through numerical simulations, demonstrate how the method can optimize a two-qubit gate while reducing the number of required measurements by two orders of magnitude compared to standard process tomography under realistic experimental settings. |
| title | Gate Optimization via Efficient Two-Qubit Benchmarking for NV Centers in Diamond |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.08581 |