Quantum 2.0 Review: An Ambitious and Entertaining Exploration of Quantum Physics, Though Slightly Exaggerated

Quantum 2.0
Paul Davies Penguin (UK, released November 27th); University of Chicago Press (US, released in February 2026)

In his book Quantum 2.0: The Past, Present, and Future of Quantum Physics, physicist Paul Davies concludes with a beautiful reflection: “To grasp the quantum world is to catch a glimpse of the grandeur and elegance of the physical universe and our role within it.”

This enchanting and romantic viewpoint resonates throughout the text. Quantum 2.0 presents a bold attempt to elucidate the fringes of the quantum universe, with Davies as an informed and passionate storyteller. However, his enthusiasm occasionally edges toward exaggeration, with his remarkable writing skills often compensating where more direct quotations might have been fitting.

Davies’ book is quite accessible, despite its ambitious aim of covering nearly every facet of quantum physics. He addresses quantum technologies in computing, communications, and sensing, touches on quantum biology and cosmology, and manages to explore various competing interpretations of quantum theory.

There are no equations in Quantum 2.0, and while some technical diagrams and schematics are included, they do not detract from the reading experience.

As a writer on quantum physics myself, I appreciate how clearly Davies articulates the experiments and protocols involved in quantum information processing and encryption—a challenging task to convey.

As a navigator through the quantum realm, Davies serves as a delightful and amiable companion. His genuine curiosity and excitement are palpable. Yet, this exuberance doesn’t always align with the rigor that contemporary quantum physics research demands. In my view, most quantum-related excitement should come with cautionary notes.

For instance, within the first 100 pages, Davies asserts that quantum computers could enhance climate modeling—an assertion not widely accepted among computer scientists and mathematicians, especially concerning near-future machines.

In another section regarding quantum sensors, he mentions manufacturers proposing their utility in evaluating conditions like epilepsy, schizophrenia, and autism. I anticipated a justification or insights from experts outside the sensor industry, but the ensuing discussion was lacking in depth and critical analysis.

Additionally, the example Davies provides to demonstrate quantum computers’ advantages over classical ones dates back several years.

Less experienced readers in quantum research may find some of Davies’s speculative statements misleading, although the book remains an engaging read. This is underscored by bold assertions such as, “Whoever masters Quantum 2.0 will certainly control the world.”

To clarify, I don’t dispute Davies’ sentiments. Many gadgets that influence our lives currently depend on quantum physics, and the future may usher in even more quantized technology. I support this notion.

Emerging fields, such as quantum biology and better integration of quantum and cosmological theories, also seem poised for significant breakthroughs. Just ask the numerous researchers diligently working toward a theory of quantum gravity.

However, conveying this future to newcomers necessitates a blend of precision and subtlety in storytelling and writing.

Otherwise, the outcome may lead to disappointment.