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Quantum interferometry can identify Majorana quasiparticles. This study explores their unique spin-dependent effects on quantum dots coupled to topological superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Topological superconductors host Majorana quasiparticles, exotic states with potential in quantum computing.
  • Quantum dots coupled to superconducting leads provide a platform to study Majorana physics.

Purpose of the Study:

  • Investigate the subgap spectrum and transport properties of a quantum dot side-coupled to a topological superconducting chain.
  • Explore the spin-dependent effects of Majorana quasiparticles on quantum dot electrons.
  • Determine if quantum interferometry can unambiguously identify Majorana quasiparticles.

Main Methods:

  • Theoretical modeling of a quantum dot system interfaced with metallic and superconducting leads.
  • Analysis of proximity-induced pairing and its influence on electron spins.
  • Simulation of quantum interferometric patterns and their dependence on Majorana states and Kondo effect.

Main Results:

  • Observed unique interferometric patterns distinct for each spin component due to Majorana quasiparticles.
  • Demonstrated that proximity-induced pairing affects both spin components, despite chiral Majorana states.
  • Showcased spin-sensitive interplay between Majorana quasiparticles and the Kondo effect at zero energy.

Conclusions:

  • Quantum interferometry offers a robust method for unambiguous identification of Majorana quasiparticles.
  • The interplay between Majorana states, Kondo effect, and quantum dot electron spins provides rich physics.
  • This research advances the understanding of topological quantum matter and its potential applications.