'[The book begins] with recent experiments that involve the detection of single quantum entities, photons, particles, and energy levels of an atom. Subsequent chapters alternate between theory (especially as required to understand recent experiments - entanglement and all) and those experiments. The experiments end with SQUIDs and the theory with quantum non-demolition. The last 100 pages include 11 appendices, from qubits to quantum mechanics of electrical circuits … Each chapter and each appendix ends with exercises, some requiring serious derivations; others inviting the reader to attempt an order-of-magnitude estimate of some quantity she had probably never thought of before.' Virginia Trimble, The Observatory