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Enhanced Majorana stability in a three-site Kitaev chain.
Alberto Bordin1, Chun-Xiao Liu2, Tom Dvir2,3
1QuTech and Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands. a.bordin@tudelft.nl.
Nature Nanotechnology
|March 31, 2025
Summary
We built a three-site Kitaev chain using quantum dots to study Majorana zero modes. Extending the chain improved Majorana stability, showing potential for scalable topological quantum computing.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Majorana zero modes are exotic non-Abelian quasiparticles crucial for topological quantum computing.
- Topological superconductors, particularly the Kitaev model, are key platforms for realizing these modes.
Purpose of the Study:
- To experimentally realize and investigate Majorana zero modes in a scalable quantum-dot-based Kitaev chain.
- To assess the impact of chain length and parameter variations on Majorana zero mode stability.
Main Methods:
- Fabrication of a three-site Kitaev chain using semiconducting InSb/Al nanowires with quantum dots and superconducting segments.
- Experimental investigation of Majorana zero mode robustness by tuning coupling strengths and electrochemical potentials.
- Numerical simulations of conductance with phase averaging to compare with experimental observations.
Main Results:
- Successful realization of a three-site Kitaev chain in a hybrid nanowire device.
- Observation that extending the chain from two to three sites significantly enhances the stability of zero-energy Majorana modes.
- Experimental results align well with numerical simulations despite the absence of superconducting phase control.
Conclusions:
- Quantum-dot-based Kitaev chains offer a scalable platform for studying Majorana zero modes.
- Increased chain length demonstrably improves Majorana stability, a critical factor for fault-tolerant quantum computing.
- This work paves the way for more robust experimental realizations of topological superconducting systems.
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