Our world, of course, changed in many other ways as well since the publication of the first edition. The global pandemic impacted all areas of society and will probably transform how we work together for years to come. While in-person meetings were halted, quantum tech researchers and engineers found ways to continue their collaborations online. In the last year, many countries have announced new or expanded quantum tech initiatives. These programs are injecting significant resources into the quantum tech ecosystem. We have also noted the rise in private investment in the sector–both in quantum computing hardware companies as well as various applications startups. All this activity has sharply increased the demand for individuals who are trained in quantum computing as well as those with additional hands-on experience in coding for these machines. This, in turn, has led many universities to launch and expand their quantum information science curricular programs and for corporations to start quantum tech training programs for their teams.

With this new edition I continue to strive towards the goal of making quantum computing more accessible to a wider range of individuals. This is a technical book, but one that I hope opens the door to quantum computing for individuals who would like to get a rigorous grasp of how to make these novel computing devices work and which kinds of problems we should focus on when using these platforms.