Nuclear spin relaxation in solid state defect quantum bits via electron-phonon coupling in their optical excited state

• URL: http://arxiv.org/abs/2402.19418v2
• Date: Tue, 04 Mar 2025 16:41:01 GMT
• Title: Nuclear spin relaxation in solid state defect quantum bits via electron-phonon coupling in their optical excited state
• Authors: Gergő Thiering, Adam Gali,
• Abstract summary: We show that spin-lattice relaxation of the $14$N nuclear spin is significantly enhanced due to strong entanglement with orbital degrees of freedom.<n>We propose a straightforward and versatile textitab initio scheme for predicting orbital-dependent spin Hamiltonians for trigonal defects exhibiting orbital degeneracy.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Optically accessible solid state defect spins serve as a primary platform for quantum information processing, where precise control of the electron spin and ancillary nuclear spins is essential for operation. Using the nitrogen-vacancy (NV) color center in diamond as an example, we employ a combined group theory and density functional theory study to demonstrate that spin-lattice relaxation of the $^{14}$N nuclear spin is significantly enhanced due to strong entanglement with orbital degrees of freedom in the $|^3E\rangle$ optical excited state of the defect. This mechanism is common to other solid-state defect nuclear spins with similar optical excited states. Additionally, we propose a straightforward and versatile \textit{ab initio} scheme for predicting orbital-dependent spin Hamiltonians for trigonal defects exhibiting orbital degeneracy.

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