An iterative transversal CNOT decoder

Understand

Modern platforms for potential qubit candidates, such as trapped ions or neutral atoms, allow long range connectivity between distant physical qubits through shuttling.

• This opens up an avenue for transversal logical CNOT gates between distant logical qubits, whereby physical CNOT gates are performed between each corresponding physical qubit on the control and target logical qubits.
• However, the transversal CNOT can propagate errors from one logical qubit to another, leading to correlated errors between logical qubits.
• We have developed a multi-pass iterative decoder that decodes each logical qubit separately to deal with this correlated error.