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<p>We propose a spin-charge qubit based on a bilayer graphene and WSe<sub>2</sub> van der Waals heterostructure that together form a quantum dot and demonstrate its functionality from first-principles simulations. Electron and hole confinement as well as electrically controllable spin-orbit coupling (SOC) are modeled by self-consistently solving the Schrödinger and Poisson equations with material parameters extracted from density functional theory as inputs. In both electron and hole quantum dots, we find a two orders of magnitude enhancement of SOC (1.8 meV) compared to intrinsic graphene, in the layer directly adjacent to WSe<sub>2</sub>. Time-dependent investigations of the quantum device reveal rapid qubit gate operation in the order of picoseconds. Our simulations indicate that bilayer graphene and WSe<sub>2</sub> heterostructures provide a promising platform for the processing of quantum information.</p>

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Ab initio simulation of spin-charge qubits based on bilayer graphene-WSe2 quantum dots

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月11日

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  • Huaiyu Ge,
  • Peter Koopmann,
  • Filip Mrcarica,
  • Otto T. P. Schmidt,
  • Ilan Bouquet,
  • Mauro Dossena,
  • Mathieu Luisier,
  • Jiang Cao

摘要

We propose a spin-charge qubit based on a bilayer graphene and WSe2 van der Waals heterostructure that together form a quantum dot and demonstrate its functionality from first-principles simulations. Electron and hole confinement as well as electrically controllable spin-orbit coupling (SOC) are modeled by self-consistently solving the Schrödinger and Poisson equations with material parameters extracted from density functional theory as inputs. In both electron and hole quantum dots, we find a two orders of magnitude enhancement of SOC (1.8 meV) compared to intrinsic graphene, in the layer directly adjacent to WSe2. Time-dependent investigations of the quantum device reveal rapid qubit gate operation in the order of picoseconds. Our simulations indicate that bilayer graphene and WSe2 heterostructures provide a promising platform for the processing of quantum information.