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Ab initio simulation of spin-charge qubits based on bilayer graphene-WSe2 quantum dots
Huaiyu Ge1, Peter Koopmann1, Filip Mrcarica1
1Integrated Systems Laboratory, ETH Zurich, Zurich, Switzerland.
NPJ 2D Materials and Applications
|June 16, 2025
Summary
We developed a novel quantum dot using bilayer graphene and WSe2 for quantum information processing. This spin-charge qubit shows enhanced spin-orbit coupling and rapid gate operations, paving the way for advanced quantum computing.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Materials Science
Background:
- Quantum dots are essential for quantum information processing.
- Bilayer graphene and transition metal dichalcogenides offer unique electronic properties.
- Controlling spin-orbit coupling is crucial for qubit functionality.
Purpose of the Study:
- To propose and simulate a novel spin-charge qubit.
- To investigate the quantum dot functionality in a bilayer graphene and WSe2 heterostructure.
- To demonstrate the potential for rapid qubit gate operations.
Main Methods:
- First-principles simulations
- Self-consistent solution of Schrödinger and Poisson equations
- Density functional theory for material parameters
Main Results:
- Demonstrated electron and hole confinement in the heterostructure.
- Observed a two orders of magnitude enhancement in spin-orbit coupling (1.8 meV).
- Simulated rapid qubit gate operations on the picosecond timescale.
Conclusions:
- Bilayer graphene and WSe2 heterostructures form a promising platform for quantum dots.
- The proposed spin-charge qubit exhibits enhanced properties for quantum information processing.
- This system holds potential for advancements in quantum computing technologies.
