Bad Qubits — Learn Quantum by Doing

Multiple choice

In interleaved randomized benchmarking (IRB), the interleaved sequence is built so that the extra decay it shows (relative to a reference RB run) can be attributed to the target gate G. How is the interleaved sequence constructed?

The target gate G is applied once at the very start, before any random Cliffords, and never again
Random Cliffords are run with no inversion, and G is measured directly without any reference run
The target gate G replaces every random Clifford, so the sequence is G, G, ..., G with no random Cliffords
After every random Clifford, one copy of the target gate G is inserted: C1, G, C2, G, ..., Cm, G, then a single inverting Clifford