Qubit ZooIntroduces the circuit-QED dual-rail qubit: a logical qubit encoded in |01⟩/|10⟩ of two 3D stub superconducting cavities, coupled and controlled by a transmon ancilla. Photon loss (the dominant error) takes the system out of the single-excitation subspace to |00⟩, which is detectable as an erasure. Demonstrates noise bias strongly favoring erasure over undetectable Pauli errors.
Key Results
- Cavity dual-rail: |0_L⟩ = |01⟩, |1_L⟩ = |10⟩ of two 3D cavities
- Photon lifetime: >1 ms (3D stub cavities)
- Erasure:Pauli error ratio strongly biased (>10:1)
- QND parity measurement via transmon ancilla
- Foundation for AWS and Yale erasure qubit programs
Links
- Journal: Proceedings of the National Academy of Sciences
- arXiv: 2212.12077