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Related Experiment Videos

Dynamical Coulomb blockade and spin-entangled electrons.

Patrik Recher1, Daniel Loss

  • 1Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters
|February 3, 2004
PubMed
Summary

We explore creating mobile, nonlocal spin-entangled electrons via superconductor (SC) tunneling. Dynamical Coulomb blockade is enhanced when electrons tunnel to the same lead, not split between leads.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Superconductors (SC) exhibit unique quantum phenomena.
  • Electron tunneling is crucial for quantum devices.

Purpose of the Study:

  • Investigate mobile and nonlocal spin-entangled electron creation.
  • Analyze the dynamical Coulomb blockade effect during tunneling.

Main Methods:

  • Phenomenological description of dynamical Coulomb blockade.
  • Modeling tunneling from a BCS-superconductor to two normal leads.

Main Results:

  • Dynamical Coulomb blockade is enhanced for cotunneling into the same lead.
  • Pair-splitting tunneling to different leads is suppressed by spatial separation.

Conclusions:

  • Control over spin-entangled electron generation is possible.
  • Understanding blockade effects is key for quantum information processing.

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