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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2604.04789 |
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| _version_ | 1866918430086529024 |
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| author | Jhamnani, Mayur Redrouthu, Venkata SubbaRao Carvalho, Jose P. Feldman, Ethan Nielsen, Anders B. Kumar, Phani Nielsen, Niels Chr. Madhu, P. K. Equbal, Asif |
| author_facet | Jhamnani, Mayur Redrouthu, Venkata SubbaRao Carvalho, Jose P. Feldman, Ethan Nielsen, Anders B. Kumar, Phani Nielsen, Niels Chr. Madhu, P. K. Equbal, Asif |
| contents | PulsePol is an elegantly designed pulse-sequence-based quantum control scheme that enables polarization transfer between electron and nuclear spins, for example, in nitrogen-vacancy (NV) centers. However, previous analyses of PulsePol assumed very strong, near-ideal, instantaneous microwave pulses, which is rarely achievable at higher magnetic fields. We revisit the PulsePol scheme under finite-pulse constraints and show that its performance significantly degrades due to finite-pulse effects. Using bimodal Floquet theory, we identify the symmetry-breaking mechanism responsible for this deterioration in fidelity. By phase adjustment, we reestablish the proper symmetry of the interaction-frame spin Hamiltonian, leading to a sequence called Q-PulsePol, where "Q" reflects the restored quadrature symmetry. Our results demonstrate robustness to finite-pulse effects and improved polarization transfer efficiency, establishing Q-PulsePol as a practical and reliable scheme for bulk hyperpolarization of nuclear spins in solids using a single-mode (zero-quantum or double-quantum) transfer. This work bridges idealized quantum control with realistic pulse engineering, establishing design rules for spin-based quantum control protocols. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_04789 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quadrature-Symmetric PulsePol for Robust Quantum Control Beyond the Ideal Pulse Approximation Jhamnani, Mayur Redrouthu, Venkata SubbaRao Carvalho, Jose P. Feldman, Ethan Nielsen, Anders B. Kumar, Phani Nielsen, Niels Chr. Madhu, P. K. Equbal, Asif Quantum Physics Other Condensed Matter PulsePol is an elegantly designed pulse-sequence-based quantum control scheme that enables polarization transfer between electron and nuclear spins, for example, in nitrogen-vacancy (NV) centers. However, previous analyses of PulsePol assumed very strong, near-ideal, instantaneous microwave pulses, which is rarely achievable at higher magnetic fields. We revisit the PulsePol scheme under finite-pulse constraints and show that its performance significantly degrades due to finite-pulse effects. Using bimodal Floquet theory, we identify the symmetry-breaking mechanism responsible for this deterioration in fidelity. By phase adjustment, we reestablish the proper symmetry of the interaction-frame spin Hamiltonian, leading to a sequence called Q-PulsePol, where "Q" reflects the restored quadrature symmetry. Our results demonstrate robustness to finite-pulse effects and improved polarization transfer efficiency, establishing Q-PulsePol as a practical and reliable scheme for bulk hyperpolarization of nuclear spins in solids using a single-mode (zero-quantum or double-quantum) transfer. This work bridges idealized quantum control with realistic pulse engineering, establishing design rules for spin-based quantum control protocols. |
| title | Quadrature-Symmetric PulsePol for Robust Quantum Control Beyond the Ideal Pulse Approximation |
| topic | Quantum Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2604.04789 |