A guide to the Qiskit circuit library

By Robert Davis, Julien Gacon, Abby Mitchell, and Luciano BelloWhen it comes to quantum circuits, sometimes the “do it yourself” approach is best. Even for common subroutines like the quantum Fourier transform (QFT), a user may find that it’s better to build their circuit by hand, so they can implement it in a way that works for their specific use case. But in many cases, the circuits we need are well-studied, and we can avoid having to reinvent the wheel (potentially creating bugs in the proces