This chapter focuses on expressing quantum computation in code and the practical workflow around it: building circuits, compiling them to a device, simulating them, and running them on real hardware.
It is the applied counterpart to the theory chapters. Where Chapter IV develops fault-tolerant error correction as theory, the error-mitigation note here addresses what is actually done on today’s noisy devices; where Chapter VI describes the hardware, the running-on-hardware note here shows how circuits are dispatched to it; and the worked examples link to the QIQC archive in Chapter VIII.