Tutorials

Basics of ITensor

• ITensor Quick Start

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

• Citing the ITensor Library

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

Tensor Network Fundamentals

• Estimating the Cost of Evaluating a Tensor Network

  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

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

ITensor Library Tutorials

• Choosing DMRG Parameters

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

• Introduction to 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

  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

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

• The "Args" Named Arguments System

  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

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

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