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Isotope-Purification-Induced Reduction of Spin-Relaxation and Spin-Coherence Times in Semiconductors

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Eiles,  Matthew T.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Ivady,  Viktor
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Bulancea-Lindvall, O., Eiles, M. T., Son, N. T., Abrikosov, I. A., & Ivady, V. (2023). Isotope-Purification-Induced Reduction of Spin-Relaxation and Spin-Coherence Times in Semiconductors. Physical Review Applied, 19(6): 064046. doi:10.1103/PhysRevApplied.19.064046.


Cite as: https://hdl.handle.net/21.11116/0000-000D-A8F2-4
Abstract
Paramagnetic defects and nuclear spins are often the major sources of decoherence and spin relaxation in solid-state qubits realized by optically addressable point defect spins in semiconductors. It is commonly accepted that a high degree of depletion of nuclear spins can enhance the coherence time by reducing magnetic noise. Here we show that the isotope purification beyond a certain optimal level can become contraproductive when both electron and nuclear spins are present in the vicinity of the qubits, particularly for half-spin systems. Using state-of-the-art numerical tools and considering the silicon-vacancy qubit in various spin environments, we demonstrate that the coupling of the spin-3/2 qubit to a spin bath of spin-1/2 point defects in the lattice can be significantly enhanced by isotope purification. The enhanced coupling shortens the spin-relaxation time that in turn may limit the coherence time of spin qubits. Our results can be generalized to triplet point defect qubits, such as the nitrogen-vacancy center in diamond and the divacancy in silicon carbide.