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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="/img/favicon.ico"/>
<title>ITensor</title>
<link rel="stylesheet" href="css/mystyles.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
<nav class="navbar is-primary" role="navigation" aria-label="main navigation">
<div class="navbar-brand">
<a class="navbar-item" href="/">
<a class="navbar-item has-text-weight-bold">ITensor</a>
</a>
<a role="button" class="navbar-burger" aria-label="menu" aria-expanded="false" data-target="navbarBasicExample">
<span aria-hidden="true"></span>
<span aria-hidden="true"></span>
<span aria-hidden="true"></span>
</a>
</div>
<div id="navbarBasicExample" class="navbar-menu">
<div class="navbar-start">
<div onclick="" class="navbar-item has-dropdown is-hoverable">
<a class="navbar-link">
Documentation
</a>
<div class="navbar-dropdown">
<a href="https://itensor.github.io/ITensors.jl/dev" class="navbar-item">
Julia (Recommended)
</a>
<a href="/docs.cgi" class="navbar-item">
C++
</a>
<a href="https://www.scipost.org/SciPostPhysCodeb.4" class="navbar-item">
ITensor Paper
</a>
</div>
</div>
<a href="/news/" class="navbar-item">
News
</a>
<a href="/codes/" class="navbar-item">
Codes
</a>
<a href="https://itensor.discourse.group" class="navbar-item">
Discuss
</a>
<div onclick="" class="navbar-item has-dropdown is-hoverable">
<a class="navbar-link">
About
</a>
<div class="navbar-dropdown">
<a href="/about/" class="navbar-item">
About ITensor
</a>
<a href="/citing/" class="navbar-item">
Citing ITensor
</a>
<a href="/faq/" class="navbar-item">
Frequently Asked Questions (FAQ)
</a>
<a href="http://itensor.org/docs.cgi?page=papers" class="navbar-item">
Papers Using ITensor
</a>
</div>
</div>
</div>
</div>
</nav>
<section class="hero is-small is-primary">
<div class="hero-body">
<div class="container has-text-centered is-capitalized">
<p class="title is-capitalized">
ITensor
</p>
<p>
<img style="height:120px;" src="/img/ITensorMan_square_alpha.png"/>
</p>
<p class="subtitle">
High-performance tensor software <br/>inspired by tensor diagrams
</p>
</div>
</div>
</section>
<!--
Begin Code Examples Section
-->
<section class="section"><div class="container is-max-desktop">
<p class="title is-4">Code Examples</p>
<p>Contracting two ITensors</p>
<div class="block"><div class="columns is-vcentered">
<div class="column has-text-centered">
<img width="320px" src="/img/contraction.png"/>
</div>
<div class="column">
<pre class="has-background-black-ter"><code class="has-text-white-ter">C = A * B</code></pre>
</div>
</div></div>
<p>Factoring an ITensor</p>
<div class="block"><div class="columns is-vcentered">
<div class="column has-text-centered">
<img width="320px" src="/img/svd.png"/>
</div>
<div class="column">
<pre class="has-background-black-ter"><code class="has-text-white-ter">U,S,V = svd(T,i,j)</code></pre>
</div>
</div></div>
<p>
To view more code examples, <a href="/examples/">click here</a>.
</p>
</div></section>
<!--
End Code Examples Section
-->
<!--
Begin Installing Section
-->
<a name="installing"></a>
<section class="section"><div class="container is-max-desktop">
<p class="title is-4">Installing</p>
<p class="mb-2">
The Julia version of ITensor (recommended) is easy to install through the Julia package manager:
</p>
<p>
<pre class="p-3 has-background-black-ter"><code class="has-text-white-ter">$ julia
<span style="color:#64CE91;">julia></span> ]
<span style="color:#528CE3;">pkg></span> add ITensors</code></pre>
</p>
<br/>
<p class="mb-2">
<br/>
To install other packages such as ITensorMPS, follow the same steps just replacing "ITensors" with the package name.
</p>
<!--
<br/>
<p class="mb-2">
For the C++ version of ITensor see <a href="/docs.cgi?vers=cppv3&page=install">C++ installation instructions</a>.
</p>
<p>
To learn more about which version may be best for you to use and why,
please <a href="https://itensor.github.io/ITensors.jl/dev/faq/JuliaAndCpp.html">read this FAQ page</a> about Julia versus C++ ITensor.
</p>
-->
</div></section>
<!--
End Installing Section
-->
<!--
Begin Features Section
-->
<a name="features"></a>
<section class="section"><div class="container is-max-desktop">
<p class="title is-4">What Makes ITensor Unique?</p>
<div class="block"><div class="columns">
<div class="column">
<img width="240px" src="/img/itensor_03.gif"/>
<p class="title is-5">Intelligent Indices</p>
<p>
The indices of an ITensor have unique identities. When contracting two ITensors,
matching indices "find" each other and contract automatically.
Adding two ITensors is literally as easy as A+B. Groups of ITensors can
be arranged into networks which know their topology.
</p>
</div>
<div class="column">
<img width="240px" src="/img/itensor_06.gif"/>
<p class="title is-5">Quantum Number Conserving ITensors</p>
<p>
ITensors can be quantum number conserving (invariant under group symmetries)
by storing block-sparse data and other information. Quantum number conserving
ITensors are nearly as easy to use as regular, dense ITensors.
</p>
</div>
</div></div>
<div class="block"><div class="columns">
<div class="column">
<img width="240px" src="/img/itensor_01.gif"/>
<p class="title is-5">Quantum Physics Tools</p>
<p>
Easily turn human-readable sums of operators into a compressed
MPO tensor network, a quantum circuit, and more.
These intermediate formats can be used to find ground states,
perform real-time or imaginary-time evolution, and other tasks.
</p>
</div>
<div class="column">
<img width="240px" src="/img/itensor_02.gif"/>
<p class="title is-5">MPS and MPO Algorithms</p>
<p>
ITensor includes a full set of algorithms involving matrix product state (MPS)
and matrix product operators (MPO), such as state-of-the-art
<a href="https://itensor.github.io/ITensors.jl/dev/tutorials/DMRG.html">DMRG</a>
and
<a href="https://itensor.github.io/ITensors.jl/dev/tutorials/MPSTimeEvolution.html">time-evolution codes</a>, and algorithms for summing, multiplying,
and optimizing MPS and MPOs.
</p>
</div>
</div></div>
</div></section>
<!--
End Features Section
-->
<br/>
<br/>
<footer class="footer">
<div class="content has-text-centered">
<p>
<a href="https://github.com/ITensor/ITensors.jl">ITensor Source on Github</a>
·
<a href="https://twitter.com/itensorlib">Twitter @ITensorLib</a>
·
<a href="https://github.com/ITensor/ITensorWebsite">Website Source on Github</a>
<br/>
© 2022 ITensor Collaboration.
<br/>
Animations by Sherry Choi and Lucy Reading-Ikkanda.
</p>
</div>
</footer>
</body>
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