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Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states
Francesco Zatelli1, David van Driel1, Di Xu1
1QuTech and Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands.
Nature Communications
|September 10, 2024
Summary
Researchers created more robust "poor man
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
- Topological Superconductivity
Background:
- Kitaev chains in quantum dot-superconductor arrays offer a promising route to topological superconductivity.
- Majorana zero modes, specifically "poor man's Majorana" states in two-site chains, are key but require enhanced robustness for quantum applications.
- Existing methods face challenges with external perturbations and limited energy scales.
Purpose of the Study:
- To engineer more robust "poor man's Majorana" states in a two-site Kitaev chain.
- To improve the energy scales and reduce sensitivity to charge fluctuations for these topological states.
- To establish a platform for realizing longer Kitaev chains and exploring non-Abelian physics.
Main Methods:
- Fabrication of a two-site Kitaev chain utilizing Yu-Shiba-Rusinov states within proximitized quantum dots.
- Deterministic tuning of the hybridization between quantum dots and the superconductor.
- Experimental observation and characterization of the "poor man's Majorana" states.
Main Results:
- Successfully realized "poor man's Majorana" states with an energy gap exceeding 70 μeV.
- Demonstrated significantly reduced sensitivity to charge fluctuations compared to non-proximitized dots.
- Achieved systematic control over the hybridization and improved energy scales of the topological states.
Conclusions:
- The use of Yu-Shiba-Rusinov states in proximitized quantum dots provides a robust platform for "poor man's Majorana" states.
- The enhanced energy scales and reduced noise sensitivity are crucial for advancing quantum information processing.
- This work paves the way for building longer Kitaev chains, parity qubits, and demonstrating non-Abelian quantum statistics.
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