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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2412.13278 |
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| _version_ | 1866929715168673792 |
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| author | Bernier, Shannon Sinha, Mekhola Pearson, Tyler J. Sushko, Peter V. Oyala, Paul H. Siegler, Maxime A. Phelan, W. Adam Neill, Abby N. Freedman, Danna E. McQueen, Tyrel M. |
| author_facet | Bernier, Shannon Sinha, Mekhola Pearson, Tyler J. Sushko, Peter V. Oyala, Paul H. Siegler, Maxime A. Phelan, W. Adam Neill, Abby N. Freedman, Danna E. McQueen, Tyrel M. |
| contents | Elucidating the factors limiting quantum coherence in real materials is essential to the development of quantum technologies. Here we report a strategic approach to determine the effect of lattice dynamics on spin coherence lifetimes using oxygen deficient double perovskites as host materials. In addition to obtaining millisecond $T_1$ spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that $T_2$ enhancement in $Sr_2CaWO_{6-δ}$ over previously studied $Ba_2CaWO_{6-δ}$ is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as $W^{5+}$ via electron paramagnetic resonance spectroscopy. Further, a combination of experimental and computational techniques enabled quantification of the relative strength of spin-phonon coupling of each phonon mode. This analysis demonstrates the effect of thermodynamics and site symmetry on the spin lifetimes of $W^{5+}$ paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_13278 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Symmetry-mediated quantum coherence of $W^{5+}$ spins in an oxygen-deficient double perovskite Bernier, Shannon Sinha, Mekhola Pearson, Tyler J. Sushko, Peter V. Oyala, Paul H. Siegler, Maxime A. Phelan, W. Adam Neill, Abby N. Freedman, Danna E. McQueen, Tyrel M. Materials Science Elucidating the factors limiting quantum coherence in real materials is essential to the development of quantum technologies. Here we report a strategic approach to determine the effect of lattice dynamics on spin coherence lifetimes using oxygen deficient double perovskites as host materials. In addition to obtaining millisecond $T_1$ spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that $T_2$ enhancement in $Sr_2CaWO_{6-δ}$ over previously studied $Ba_2CaWO_{6-δ}$ is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as $W^{5+}$ via electron paramagnetic resonance spectroscopy. Further, a combination of experimental and computational techniques enabled quantification of the relative strength of spin-phonon coupling of each phonon mode. This analysis demonstrates the effect of thermodynamics and site symmetry on the spin lifetimes of $W^{5+}$ paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits. |
| title | Symmetry-mediated quantum coherence of $W^{5+}$ spins in an oxygen-deficient double perovskite |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.13278 |