Qubit ZooProposes an encoded superconducting qubit using two coupled transmons with logical states |0⟩ = |01⟩ and |1⟩ = |10⟩ — directly inspired by semiconductor singlet-triplet spin qubit encodings. Introduces microwave-free control via baseband detuning pulses and shows the approach is especially suited to variable super-semi Josephson junctions. This paper is the intellectual origin of both the composite qubit (CQB) and the cavity dual-rail qubit.
Key Results
- Encoded qubit: |0_L⟩ = |01⟩, |1_L⟩ = |10⟩ of two coupled transmons
- Microwave-free single-qubit gates via baseband detuning
- Two-qubit CNOT between encoded pairs via capacitive coupling
- Natural fit for gatemon/super-semi junctions (gate-voltage control)
- Hamiltonian formally identical to singlet-triplet spin qubit
Links
- Journal: Nature Communications
- arXiv: 1507.07923