Quantum ( Un) speakables From Bell to Quantum Information

issues raised by quantum theory, a topic not very popular during his student days at Queen's University, Belfast. It had been proved by John von Neumann that no hidden variable theory could agree with quantum mechanics. So while John Bell had flung open the door widely for hidden variable theories, he immediately dealt them a major blow.

This outstanding collection of essays in commemoration of John S. Bell is the result of the "Quantum (Un)speakables" conference organised by the University of Vienna. The title was taken from a famous note written by John Bell during the "Schrödinger Symposium" of 1987. The book leads the reader from the foundations of quantum mechanics to quantum entanglement, quantum cryptography, and quantum information, and is written for all those who need more insight into this new area of physics.