Qubit ZooFirst experimental demonstration of a dual-rail erasure qubit in superconducting circuits. Encodes a qubit in the single-photon subspace of two coupled transmon-based cavities, where the dominant T₁ errors are converted to detectable erasure events (photon loss leaves the codespace). Achieves coherence times significantly beyond the T₁ limit of the individual components.
Key Results
- Erasure detection rate: >99% of T₁ errors detected as erasures
- Effective T₁ (undetected error): ~10× improvement over bare transmon T₁
- Dual-rail encoding: |0⟩ = |10⟩, |1⟩ = |01⟩ across two modes
- Compatible with surface code error correction with reduced overhead
Links
- Journal: Physical Review X
- arXiv: 2307.08737