I am looking for a paper where the threshold for 7-qubit code having a syndrome extraction based on flag qubits has been done.
In the original paper about flag qubits, there is an estimation of pseudo-threshold assuming the waiting (i.e. identity) gates are noiseless. Yet this assumption is not necessarily very good to do, especially because the number of waiting location dominates by very far the number of non-trivial gates for flag-qubit scheme. What I am looking for is a paper showing an estimate of the threshold assuming all gates (including identity) have the same error rate (which would lead to a worst-case scenario, given the sole knowledge of an error rate per gate).
Is there such a paper?