Qubit ZooFirst demonstration of coherent manipulation of a singlet-triplet qubit in a GaAs double quantum dot. Showed coherent exchange oscillations between singlet and triplet states with nanosecond gate times, establishing the singlet-triplet encoding as a viable qubit.
Key Results
- Coherent singlet-triplet oscillations with T₂* ≈ 10 ns (GaAs, limited by nuclear spins)
- Exchange gate time: ~200 ps
- Readout via spin-to-charge conversion through Pauli spin blockade
- First two-electron qubit with all-electrical control
Links
- Journal: Science
- arXiv: cond-mat/0510735