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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

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Researchers created more robust "poor man

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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.