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Updated: Jun 24, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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A two-site Kitaev chain in a two-dimensional electron gas
Sebastiaan L D Ten Haaf1, Qingzhen Wang1, A Mert Bozkurt1
1QuTech and Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands.
Nature
|June 12, 2024
Summary
Researchers engineered artificial Kitaev chains to create Majorana bound states (MBSs) in hybrid systems. They achieved control over couplings, observing robust zero-bias peaks, paving the way for scalable Majorana-based qubits.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Artificial Kitaev chains are theoretical constructs for realizing Majorana bound states (MBSs).
- Superconductor-semiconductor hybrids are a promising platform for hosting MBSs.
Purpose of the Study:
- To experimentally realize a two-site artificial Kitaev chain in a two-dimensional electron gas.
- To demonstrate control over inter-dot couplings and tune the system to specific parameter regimes.
- To investigate the hybridization and properties of localized MBSs for quantum computing applications.
Main Methods:
- Coupling two quantum dots via a superconductor-proximitized region.
- Utilizing in-plane magnetic field rotations and electrostatic gating for coupling control.
- Employing tunneling spectroscopy to observe zero-bias conductance peaks and probing energy spectra.
Main Results:
- Successful realization of a tunable two-site Kitaev chain.
- Observation of robust correlated zero-bias conductance peaks at specific parameter sweet spots.
- Estimation of Majorana polarization and study of MBS hybridization.
Conclusions:
- The developed platform offers a scalable and flexible approach for engineering MBSs.
- This work provides a realistic pathway for advanced experiments involving multiple MBSs.
- The findings are crucial for the development of Majorana-based qubits.
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