Quantum computers promise to transform our notions of computation by offering\na completely new paradigm. To achieve scalable quantum computation, optimizing\ncompilers and a corresponding software design flow will be essential. We\npresent a software architecture for compiling quantum programs from a\nhigh-level language program to hardware-specific instructions. We describe the\nnecessary layers of abstraction and their differences and similarities to\nclassical layers of a computer-aided design flow. For each l…