@ITensorLib

Software for tensor networks inspired by tensor diagrams, in Julia and C++. Supported by the Flatiron Institute, a division of the Simons Foundation.

 New York, NY
itensor.org/
Joined October 2015
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  • Following45
  • Followers1.1K
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ITensor has a paper! We lay out the philosophy behind ITensor and give lots of examples of the key parts of the interface (mostly in Julia). We also discuss some advanced features, NDTensors.jl, and some future plans. arxiv.org/abs/2007.14822

The ITensor Software Library for Tensor Network Calculations

ITensor is a system for programming tensor network calculations with an interface modeled on tensor diagram notation, which allows users to focus on the connectivity of a tensor network without...

arxiv.org
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Example model 1D system showing a beyond-group symmetry studied with ITensor DMRG. "Non-invertible symmetry-protected topological order in a group-based cluster state" Christopher Fechisin, Nathanan Tantivasadakarn, Victor V. Albert. arxiv.org/abs/2312.09272

Non-invertible symmetry-protected topological order in a...

Despite growing interest in beyond-group symmetries in quantum condensed matter systems, there are relatively few microscopic lattice models explicitly realizing these symmetries, and many...

arxiv.org
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Our new ITensor GPU backend system is now live in the latest Julia version, building on hard work by Karl Pierce and Matt Fishman, using the elegant new package extension system. See Matt's post about the initial release here: itensor.discourse.group/t/an…

[ANN] Initial release of new ITensor GPU backends

EDIT: For the latest information about GPU support in the Julia version of ITensor, take a look at the documentation page Running on GPUs · ITensors.jl. We are happy to announce an initial release of...

itensor.discourse.group
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Exciting update on what’s new in Julia. Very informative thread:
Cameron
@just_cameron28 Jul 2023
#JuliaCon final day! The keynote is the State of Julia talk, my favorite one each year :)
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Roadmap for @ITensorLib at #juliacon, more details coming later in the mini! Get ready for tensor networks to solve everything 🤓.
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Replying to @ITensorLib
@ITensorLib is BACK at #juliacon. Matt Fishman from @FlatironCCQ presenting exciting updates to my “decent” gpu backend, among others.
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Beautiful agreement between numerics (DMRG based on ITensor) and Ginzburg-Landau theory calculations of coexistence of CDW and superconductivity in t-t'-U Hubbard model. arxiv.org/abs/2307.11820

Fragmented superconductivity in the Hubbard model as solitons in...

The phenomena of superconductivity and charge density waves are observed in close vicinity in many strongly correlated materials. Increasing evidence from experiments and numerical simulations...

arxiv.org
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From scratch implementation of DMRG using Julia version of ITensor by one of our users - check it out:
Takis Angelides@Takis_Angelides19 Jun 2023
Implemented from scratch the DMRG algorithm with @ITensorLib, which can be a helpful example on the basics of ITensors and to understand the details of DMRG's implementation. Code: github.com/TakisAngelides/IT…
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"Quantics tensor trains" (amplitude encoded functions represented as MPS) to represent Green's functions. Like using a tiny quantum computer to represent correlation functions of quantum systems (implemented with ITensor) journals.aps.org/prx/abstrac…

Multiscale Space-Time Ansatz for Correlation Functions of Quantum Systems Based on Quantics Tensor...

A new way of encoding multipoint correlation functions---key to representing complex correlations among particles---greatly reduces their computation time and storage requirements.

journals.aps.org
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Enhanced estimation of quantum state properties, tested using ITensor and PastaQ arxiv.org/abs/2304.12292

Enhanced estimation of quantum properties with common randomized...

We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about the quantum state of interest. This method involves performing...

arxiv.org
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Why do some parts of ITensors.jl have type instabilities and use dynamic dispatch, and does this hurt performance? A good answer by Matt Fishman to this question: itensor.discourse.group/t/dy…

Dynamic Dispatch Question

@Bob it’s a very good question and I’m surprised this is one of the first questions we have received about this! In general, we already use function barriers effectively to ensure tensor operations...

itensor.discourse.group
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Our DMRG study of the quantum critical point in 1D water is published @PhysRevLett. This work wouldn't be possible without the incredible @ITensorLib software. Also, don't miss the fantastic Viewpoint by Marivi Fernández-Serra @Perimeter @UWaterloo journals.aps.org/prl/abstrac…

Quantum Phase Transition in the One-Dimensional Water Chain

Water molecules that are close enough to ``see'' each other but far enough apart to be gas-like can undergo a quantum phase transition, a finding of relevance for making future water-based quantum...

journals.aps.org
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Compression of Green and vertex functions in real and momentum space as MPS and MPO tensor networks, for solving Dyson equation and other quantum applications (partially implemented with ITensors.jl):
Hiroshi Shinaoka@HShinaoka25 Oct 2022
A new preprint on a quantum-inspired classical algorithm for efficient calculations based on a quantum field theory arxiv.org/abs/2210.12984

Multiscale space-time ansatz for correlation functions of quantum...

Correlation functions of quantum systems -- central objects in quantum field theories -- are defined in high-dimensional space-time domains. Their numerical treatment thus suffers from the curse...

arxiv.org
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ITensor used to benchmark a state-of-art quantum simulator (Quantinuum trapped ion system used to simulate the quantum dynamics of a Floquet contact process) arxiv.org/abs/2209.12889
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To learn how to set up your own time-evolution code, see our tutorial here: itensor.github.io/ITensors.j…
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We also have a TDVP package that’s almost done - you can already use it now github.com/ITensor/ITensorTD…
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Our first code tutorial for ML(QC)2 @NorditaSweden featuring @giactorlai and the @ITensorLib based quantum circuit simulator PastaQ juliapackages.com/p/pastaq
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Two weeks ago I finished my internship at @FlatironCCQ working on the superconducting properties of the t-t’ Hubbard model using @ITensorLib. A great experience in a great place, where I got to meet brilliant researchers and make a lot of friends. Hope to be back soon!
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The ITensor Paper is published! Nice to see other leading software efforts e.g. @NetKetOrg) also publishing in SciPost Codebases
SciPost Physics @[email protected]@SciPost_Physics23 Aug 2022
New #openaccess publication #SciPost #physics #codebases The ITensor Software Library for Tensor Network Calculations M. Fishman, S.R. White, E.M. Stoudenmire @ITensorLib SciPost Phys. Codebases 4 (2022) scipost.org/SciPostPhysCodeb… @FlatironInst @UCIrvine @NSF @SimonsFdn @ENERGY
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If you're using a new M-series Mac, the new Julia 1.8 is a good time to upgrade to the ARM version of Julia. ITensor DMRG (1D Hubbard model) is **twice as fast** as Julia 1.7 running in Rosetta (Intel emulation) mode.
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Check out this innovative new journal, focused on scientific software and using separate DOIs for the paper and code (and soon to be home of the ITensor paper):
SciPost.org @[email protected]@scipost_dot_org22 Aug 2022
We are thrilled to announce the first paper in our newest journal, SciPost Phys. Codebases! A new-generation journal for codes and algorithms in Physics research. scipost.org/SciPostPhysCodeb Check out its first publication: the ALF project 2.0 (Assaad et al.) scipost.org/SciPostPhysCodeb…
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