Tutorials

Basics of ITensor

• [[ITensor Quick Start|tutorials/quickstart]]

  Simplest non-trivial program (similar to "hello world") based on the ITensor library.

• [[Citing the ITensor Library|tutorials/citing]]

  How to cite the ITensor Library in a paper or published work.

Tensor Network Fundamentals

• [[Estimating the Cost of Evaluating a Tensor Network|tutorials/cost]]

  We discuss how to determine the cost of evaluating a tensor network and best practices for computing properties of matrix product states.

• [[Fermions and Jordan-Wigner String|tutorials/fermions]]

  Learn how to map fermionic operators to bosonic operators with non-local "string" operators.

ITensor Library Tutorials

• [[Choosing DMRG Parameters|tutorials/dmrg_params]]

  Learn how to choose optimal parameters (number of sweeps; cutoff; etc) for DMRG calculations of ground states.

• [[Introduction to AutoMPO|tutorials/AutoMPO]]

  Instead of making MPOs by hand, ITensor has a facility to create MPOs using a simple interface resembling hand-written mathematical notation.

• [[Calculating a Two-Site Correlation Function|tutorials/correlations]]

  Contracting a tensor network to measure a two-operator correlation function from an MPS is shown in diagrammatic form with ITensor code.

C++ Utilities

• [[ITensor Input Parameter System|tutorials/input]]

  ITensor comes with an optional input parameter system you can use to read simulation parameters from an external file.

• [[The "Args" Named Arguments System|tutorials/args]]

  Args is a system used in ITensor to pass named parameters to functions, and can be a useful addition to your own code. Examples of named arguments include SVD accuracy parameters ("Maxm", "Cutoff") and parameters controlling the amount of information printed by an algorithm.

• [[Git Quickstart Guide|tutorials/git]]

  Git is the version control system used to maintain ITensor. Learn the basic git workflow and how to contribute to the ITensor code base.