An entangling gate for dual-rail erasure qubits

A bias-preserving controlled-Z gate between two dual-rail cavity qubits implemented by a swap–wait–swap sequence through a transmon coupler.

Key Results

Gate duration of about 500 ns
Erasure probability of about 0.5% per gate and residual Pauli errors below 0.1%
Bit-flip errors at the $1 0^{- 6}$ level while preserving the erasure-dominated hierarchy