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Matériau paramagnétique pour l'information quantique : manipulations des spins électroniques et nucléaires dans β − Ga2O3 : Ti

Abstract : Quantum information processing is a major challenge both on fundamental and technological grounds. In this research field, the spin bus concept relies on the use of both the electronic and nuclear spins in which the electron is used as a reading and writing head over the nuclei system which makes the qubit register. The requested material to build a spin bus must have unpaired electrons delocalized over a great number of nuclear spins having long decoherence time. In this work, we studied a spin system composed of titanium (III) interacting with multiple gallium nuclei in gallium oxide. We synthesized and studied the titanium paramagnetic center in gallium oxide single-crystals by continuous wave EPR and ENDOR spectroscopy and showed that the electron is delocalized over eight neighbouring gallium nuclei. This study also revealed a strong isotopic effect on the nucleus-nucleus interaction mediated by the electron. When the two nearest gallium nuclei surrounding the titanium are identical (same isotopes) this interaction is one order of magnitude higher than in the case of inequivalent nuclei. This effect can be used in order to reduce the computation time. Finally, the dynamical properties of the spin system have been characterized by pulsed EPR and ENDOR spectroscopy. The electron spin decoherence is driven by instantaneous and spectral diffusion. The nuclear dynamical properties have also been studied in order to determine the order of magnitude of nuclear spin relaxation and decoherence time.
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https://pastel.archives-ouvertes.fr/pastel-00630227
Contributor : Anne Joubert <>
Submitted on : Friday, October 7, 2011 - 4:47:35 PM
Last modification on : Tuesday, September 22, 2020 - 3:58:43 AM
Long-term archiving on: : Sunday, January 8, 2012 - 2:31:40 AM

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  • HAL Id : pastel-00630227, version 1

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Frédéric Mentink-Vigier,. Matériau paramagnétique pour l'information quantique : manipulations des spins électroniques et nucléaires dans β − Ga2O3 : Ti. Autre [cs.OH]. Chimie ParisTech, 2011. Français. ⟨pastel-00630227⟩

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