Advances in Quantum Entanglement and Decoherence

Dear Colleagues,

The basis of decoherence has solidly been established, both experimentally and theoretically. Indeed, it is a necessary condition of the transition from quantum to classical physics, inducing non-unitary temporal evolution and introducing classical probabilities. The establishment of such an important effect naturally raises a number of questions and initiates further study.

The decoherence arising from different interactions plays different roles, and it can be a key element of the emergence of the classical space-time and classical fields in general. Decoherence has been found to be important in the measurement theory, in establishing super-selection rules, in the quantum Hall effect, in quantum computation, in neutrino oscillation, to mention only several examples. The decoherence is similar in origin but different in appearance as dissipation and as a possible source of the quantum time arrow.

The description and comprehension of the decoherence proceed in the framework of open quantum systems and its optimal scheme is many-body theory, more precisely quantum field theory, to deal with the usually macroscopic environment. More careful treatment requires the proper handling of relativistic effects, as well.

The possible investigations of such a wide range of phenomena and the new initiatives to further enlarge the family of physical processes where decoherence plays an important role are the subject of this Special Issue.

Prof. Dr. Janos Polonyi
Guest Editor

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• open quantum systems
• dissipation
• time arrow
• quantum-classical transition
• emergence of classical physics
• measurement theory
• quantum computation