Qubit Zoo

Universal non-adiabatic control of small-gap superconducting qubits

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Demonstrates the superconducting composite qubit (CQB): two capacitively coupled transmons forming a small avoided crossing controlled entirely by non-resonant, non-adiabatic baseband pulses and coherent Landau-Zener interference. Achieves universal single-qubit control and coupled CQB operations without any microwave drives — the first experimental realization of microwave-free superconducting quantum logic.

Key Results

  • Composite qubit: two coupled transmons, gap smaller than temperature
  • Control: solely baseband pulses + Landau-Zener interference
  • Clifford fidelity: >99.7% (randomized benchmarking)
  • Coupled CQB-CQB operations demonstrated
  • No microwave generators/mixers/filters needed

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