Qubit ZooProposes the persistent-current (flux) qubit: a superconducting loop interrupted by three Josephson junctions, where the qubit states are clockwise and counterclockwise persistent currents. Operated near half-flux-quantum bias for maximum protection.
Key Results
- Qubit states: clockwise/counterclockwise supercurrents (~300 nA)
- Three-junction loop with one junction smaller by factor α ≈ 0.75
- Tunnel splitting tunable via external flux
- First proposed superconducting qubit with macroscopic persistent currents
Links
- Journal: Science