Density matrix embedding theory

Density Matrix Embedding Theory (DMET) is a computational method used in quantum physics and quantum chemistry to study strongly correlated quantum systems. It is particularly useful for systems where traditional methods, like Density Functional Theory (DFT) or conventional quantum Monte Carlo approaches, struggle due to the presence of strong electronic correlations. ### Key Concepts of DMET: 1. **Density Matrix**: The density matrix is a mathematical representation that provides a complete description of a quantum state, including both pure and mixed states.