Quantum Information Theory
Quantum Darwinism
Quantum Darwinism is a framework in quantum foundations proposing that classical objectivity emerges because information about certain preferred states of a quantum system is redundantly recorded across many parts of its environment. Introduced by Wojciech H. Zurek in 2009, it extends decoherence theory by treating the environment as a communication channel that proliferates stable, ‘pointer’ information accessible to multiple independent observers. The approach connects environment-induced superselection, redundancy, and information-theoretic measures to explain why many observers agree on classical outcomes.
Quantum Entanglement
Quantum entanglement is a fundamental phenomenon in quantum mechanics where pairs or groups of particles become interconnected in such a way that the quantum state of one particle cannot be described independently of the others, even when the particles are separated by large distances. This phenomenon was famously described by Albert Einstein as 'spooky action at a distance' and has been a subject of extensive research and debate in the field of quantum physics.