Quadratic Configuration Interaction (QCI) is a method used in quantum chemistry to describe electronic correlation effects in many-body systems, particularly in the context of molecular electronic structure calculations. It is an extension of Configuration Interaction (CI) methods, aiming to improve the accuracy of predictions regarding the electronic properties of molecules. ### Key Features of QCI: 1. **Configuration Interaction Framework**: - CI methods involve the linear combination of various electronic configurations (determinants) to capture electron correlation.
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