Tensor Network States

Structured factorizations of exponentially large wavefunction tensors. The main concepts are MPS, PEPS, MERA, bond dimension. Each must be defined in the context of a concrete physical model, mathematical representation, or experimental task. Terminology alone does not establish the behavior of the system.

A rigorous starting point is to specify the state space and governing equations, identify conserved quantities or symmetries, and calculate at least one measurable outcome. The equation below is a topic-specific identity or model. Its assumptions must be checked before applying it.

To progress beyond a conceptual introduction, derive one tractable limiting case, compare it against a numerical or experimental counterexample, and test sensitivity to noise, boundaries, or approximation. The connected QuantumSpark courses provide extended derivations; source links give original university or scholarly context.