As usual in QEC there are ancillary qubits set to the ground state.
In a QEC scheme, not necessarily such a qubit is used immediately.
In Qiskit framework, i think, all the qubits are initialized to the ground state simultaneously at the beginning.
Hence I was wondering, when I need an ancillary after a while, is it better to let it stays idle until I need it or it is better to put a reset operation just before its usage?
