Decoherence and Quantum Darwinism

'A magnificent, defining work by the foremost authority on the transition from quantum to classical. Over the past forty years, Zurek has put forward one groundbreaking idea after another about how interactions of quantum systems with their environment explain the many puzzling aspects of the emergence of classical behavior. His guiding principle, 'let quantum be quantum,' has turned out to be the key to unlocking the secrets of how quantum systems effectively become classical. The theories he has developed, from einselection to quantum Darwinism, have led to a seminal shift in our understanding of the quantum-to-classical transition and have been confirmed time and again in the laboratory. Written in an impressively engaging and accessible style, the book is the definitive text on all aspects of the quantum-to-classical transition. It will be an indispensable companion for anyone interested in modern quantum mechanics, from students to researchers.' Maximilian Schlosshauer, University of Portland
'Physicists puzzled by the fate of Schrödinger's cat are often advised, tongue in cheek, to 'shut up and calculate'. If they are not satisfied by this commandment, they will be inspired by Wojciech Zurek's new book. The ideas of this pioneer of quantum information theory about environment induced decoherence and physical reality are exposed here with great clarity. Starting from the quantum postulates, Zurek guides us along a path across the elusive quantum to classical boundary, masterfully describing every step, avoiding circular reasoning, answering frequently asked questions about superpositions, measurement and entanglement. With his Darwinian metaphor describing the survival of the fittest 'pointer states' in a huge quantum space, Zurek proposes a thoughtful reconciliation between Bohr's Copenhagen credo and Everett's many-world picture. This timely book to mark the 100th anniversary of quantum mechanics is readable at many levels. It will be a gem for teachers and for graduate students eager to understand quantum physics better.' Serge Haroche, Collège de France
'Zurek's book is a coherent synthesis of various advances he has made in addressing the irritating unsolved question of the measurement in quantum mechanics. Quantum Darwinism claims to solve the problem by accounting for our perceptions. What I like is that it does not invoke a magic influence of our brain onto the observed quantum object. Wojciech Zurek rather asks the question of what kind of consensus various observers can gain from their observations of a system. He takes the example of a massive object whose position is observed thanks to a stream of photons. I have not dwelled deep enough in that book to evaluate how much it will allow me to progress in my understanding of the relationship between the microscopic quantum world and the macroscopic classical world, but there is no doubt that it is a stimulating book that should be read by anybody who feels concerned by the problem.' Alain Aspect, Institut d'Optique, Université Paris-Saclay, France
'Zurek explains the emergence of classicality from quantum laws in the important special case of a body immersed in an out-of-equilibrium environment like that of Earth. The book is … self-contained while connecting this fundamentally simple and attractive paradigm to the massive existing literature on decoherence and measurement.' Charles H. Bennett, IBM Research, USA
'This is a highly technical book and requires a graduate level understanding of quantum mechanics. However, Zurek has structured the book sections with thorough introductions and summaries so that the less versed reader could still learn much about the qualitative argument. Interestingly, Zurek includes 'Frequently Asked Questions' with each section where he not only clarifies points but addresses potential objections … Recommended.' E. Kincanon, Choice
'Zurek, of Los Alamos National Laboratory in New Mexico, has been working for decades to resolve the question of how the quantum rules that govern the behavior of atoms and subatomic particles switch to those of classical physics - Newton's laws of motion and so on - that operate at the scales of everyday life. his book brings together for the first time all the elements he has been developing into a grand synthesis. He argues that the old mysteries of quantum theory are starting to dissolve … the philosophy of Zurek's approach seems right to me. Instead of trying to concoct elaborate stories to resolve the measurement problem of quantum mechanics, why not patiently and carefully work through what standard quantum mechanics can say about how information regarding a quantum object gets out into the observable world? … Now we can at least hope to complete that task.' Philip Ball, Quanta Magazine