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<p>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 <i>T</i><sub>1</sub> spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that <i>T</i><sub><i>2</i></sub> enhancement in Sr<sub>2</sub>CaWO<sub>6-δ</sub> over previously studied Ba<sub>2</sub>CaWO<sub>6-δ</sub> is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as W<sup>5+</sup> 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<sup>5+</sup> paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits.</p>

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Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月18日

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  • Shannon Bernier,
  • Mekhola Sinha,
  • Tyler J. Pearson,
  • Peter V. Sushko,
  • Paul H. Oyala,
  • Maxime A. Siegler,
  • W. Adam Phelan,
  • Abby N. Neill,
  • Danna E. Freedman,
  • Tyrel M. McQueen

摘要

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 T1 spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that T2 enhancement in Sr2CaWO6-δ over previously studied Ba2CaWO6-δ is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as W5+ 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 W5+ paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits.