Decoherence from dipolar interspin interactions in molecular spin qubits
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Decoherence from dipolar interspin interactions in molecular spin qubits

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Decoherence from dipolar interspin interactions in molecular spin qubits

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Escalera Moreno, Luis; Gaita Ariño, Alejandro Perfil; Coronado Miralles, Eugenio Perfil
This document is a artículoDate2019
The realization of spin-based logical gates crucially depends on magnetically coupled spin qubits. Thus, understanding decoherence when spin qubits are in close proximity will become a roadblock to overcome. Herein, we propose a method free of fitting parameters to evaluate the qubit phase memory time Tm in samples with high electron spin concentrations. The method is based on a model aimed to estimate magnetic nuclear decoherence [P. C. E. Stamp and I. S. Tupitsyn, Phys. Rev. B 69, 014401 (2004)]. It is applied to a ground-spin J=8 magnetic molecule 1 displaying atomic clock transitions, namely [HoIII(W5O18)2]9−, which remarkably increase Tm at unusually high electron-spin concentrations. Our approach unveils the causes that limit the coherence reached at the clock transitions in challenging systems such as 1, where recent models fail.

    Escalera Moreno, Luis Gaita Ariño, Alejandro Coronado Miralles, Eugenio 2019 Decoherence from dipolar interspin interactions in molecular spin qubits Physical Review B 100 064405-1 064405-9
https://doi.org/10.1103/PhysRevB.100.064405

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