Qubit ZooDemonstrates the heavy fluxonium qubit: a fluxonium with very large shunt capacitance (low E_C ~ 0.5 GHz) operated at half-flux-quantum. Shows T₁ up to 1.5 ms — protected by the exponentially small transition matrix element between qubit states localized in different wells.
Key Results
- T₁ = 1.5 ms (protected by disjoint wavefunctions)
- E_C/h ≈ 0.5 GHz (heavy, i.e., large capacitance)
- Operated at external flux Φ = Φ₀/2
- Protection mechanism: wavefunctions localized in separate potential wells
Links
- Journal: Physical Review Letters
- arXiv: 1705.07873