Manipulation of spin cluster qubits by electric field induced modulation of exchange coupling, g-factor, and axial anisotropy

Filippo Troiani
Phys. Rev. B 100, 155424 – Published 22 October 2019

Abstract

Electric fields are increasingly used for coherently manipulating spin states in semiconductor and molecular systems. Here we discuss the spin manipulation allowed by the modulation of the main parameters entering the Hamiltonians of molecular spin clusters. In particular, we focus on transitions between states that differ in terms of scalar quantities, such as the total- or the partial-spin sums, but have vanishing expectation values of both the total- and the single-spin projections. These conditions supposedly define subspaces that are immune to the main decoherence mechanisms and that cannot be identified in individual spins, where the total- and the partial-spin sums are fixed or cannot be defined. We show that the desired transitions can in principle be realized in systems as simple as a spin dimer, by modulating the g-factor, the axial anisotropy, or, under suitable conditions, the exchange interaction.

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  • Received 24 July 2019
  • Revised 23 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.155424

©2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Filippo Troiani*

  • Centro S3, CNR-Istituto di Nanoscienze, via G. Campi 213/A, I-41125 Modena, Italy

  • *filippo.troiani@nano.cnr.it

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Issue

Vol. 100, Iss. 15 — 15 October 2019

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