  Quantum engineering seeks to create novel technologies based on the
exploitation of distinctly nonclassical behaviors such as quantum
superposition. The vast majority of currently pursued applications fall into
the domain of quantum information science, with quantum computing as the most
visible subdomain. However, other applications of quantum engineering are fast
emerging. Here, we review the deployment of quantum engineering principles in
the fields of solar energy, batteries, and nuclear energy. We identify
commonalities across quantum engineering approaches in those apparently
disparate fields and draw direct parallels to quantum information science. We
find that a shared knowledge base is forming, which de facto corresponds to a
new domain that we refer to as 'quantum energy science'. Quantum energy science
bears the promise of substantial performance improvements across energy
technologies such as organic solar cells, quantum batteries, and nuclear
fusion. The recognition of this emerging domain may be of great relevance to
actors concerned with energy innovation. It may also benefit active researchers
in this domain by increasing visibility and motivating the deployment of
resources and institutional support.
