Nicolas Gisin is a theoretical physicist, director of the Department of Applied Physics at the University of Geneva, and a pioneer in cryptography, teleportation and quantum computing. The first John Stewart Bell Prize laureate, he is co-founder of ID Quantique, a world leader in quantum cryptography.

Explaining the world at a tiny scale, quantum physics contains fundamental implications that constitute a real challenge to conventional logic. In particular the notion of "entanglement", explored over the past thirty years, leads to the very counter-intuitive existence of a chance ubiquity that can manifest itself simultaneously at several points in our universe.
This stupefying "nonlocality" is not a gratuitous abstraction or mind game: it has concrete applications in cryptography, in protecting financial data, and has allowed the demonstration of a "quantum teleportation" whose infinite possibilities even science-fiction writers struggle to grasp.
This slim book does not attempt to avoid the very real difficulties in the logic inherent in quantum physics. From "Bell's Game" to experiments in quantum entanglement, it leads towards a solid understanding of one of the most fascinating areas of modern physics.