  Understanding Quantum Technologies 2023 is a creative-commons ebook that
provides a unique 360 degrees overview of quantum technologies from science and
technology to geopolitical and societal issues. It covers quantum physics
history, quantum physics 101, gate-based quantum computing, quantum computing
engineering (including quantum error corrections and quantum computing
energetics), quantum computing hardware (all qubit types, including quantum
annealing and quantum simulation paradigms, history, science, research,
implementation and vendors), quantum enabling technologies (cryogenics, control
electronics, photonics, components fabs, raw materials), unconventional
computing (potential alternatives to quantum and classical computing), quantum
telecommunications and cryptography, quantum sensing, quantum computing
algorithms, software development tools and use cases, quantum technologies
around the world, quantum technologies societal impact and even quantum fake
sciences. The main audience are computer science engineers, developers and IT
specialists as well as quantum scientists and students who want to acquire a
global view of how quantum technologies work, and particularly quantum
computing. This version is an update to the 2022 and 2021 editions published
respectively in October 2022 and October 2021. An update log is provided at the
end of the book.
