Erasure Detection of a Dual-Rail Qubit Encoded in a Double-Post Superconducting Cavity

Experimental dual-rail qubit encoded in the symmetric and antisymmetric modes of a compact double-post superconducting cavity, with an auxiliary transmon used for erasure detection and joint-Wigner tomography.

Key Results

• Erasure rate: $3.981(3){\mathrm{ms}}^{-1}$
• Residual postselected dephasing rate: up to $0.17{\mathrm{ms}}^{-1}$
• Demonstrates a compact hardware-efficient cavity realization with a strong erasure-versus-dephasing hierarchy

Links

• Journal: Physical Review Letters

Zoo Links

• dual-rail-superconducting-qubit
• erasure-qubit