quantum entanglement and many-body systems

Quantum entanglement refers to a phenomenon in quantum mechanics where two or more particles become linked together in such a way that their states are correlated. This means that any changes in the state of one particle instantaneously affect the state of the other, regardless of their physical distance from each other. Many-body systems, on the other hand, denote a collection of multiple interacting particles, often in a condensed matter system such as a solid or liquid. These systems exhibit complex behaviors that arise from the interactions and correlations between the numerous particles involved. The study of many-body systems is crucial in understanding various phenomena, like phase transitions, superconductivity, and magnetism, among others.

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