Qubit Zoo

Coherent manipulation of Andreev states in superconducting atomic contacts

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Making and manipulating a weak-link qubit

        In superconductors, single particles cannot have energies smaller than the superconducting gap.

Key Results

  • Yet when two superconductors are separated by a thin nonsuperconducting bridge (the “weak link”), quasi-particles can occupy states that are inside the gap, the so-called Andreev bound states (ABSs).
  • Janvier et al.
  • fabricated such a structure out of superconducting aluminum and manipulated the occupation of a pair of ABSs.

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