ITensor
@ITensorLib
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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
Joined October 2015
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
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...
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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
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...
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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
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...
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Exciting update on what’s new in Julia. Very informative thread:.
#JuliaCon final day! The keynote is the State of Julia talk, my favorite one each year :).
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RT @kslimes: Roadmap for @ITensorLib at #juliacon, more details coming later in the mini! Get ready for tensor networks to solve everything….
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RT @kslimes: @ITensorLib is BACK at #juliacon. Matt Fishman from @FlatironCCQ presenting exciting updates to my “decent” gpu backend, among….
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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
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...
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From scratch implementation of DMRG using Julia version of ITensor by one of our users - check it out:.
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: .
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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
A new way of encoding multipoint correlation functions---key to representing complex correlations among particles---greatly reduces their computation time and storage requirements.
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Enhanced estimation of quantum state properties, tested using ITensor and PastaQ
arxiv.org
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...
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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
@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...
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RT @rgmelko: Our DMRG study of the quantum critical point in 1D water is published @PhysRevLett. This work wouldn't be possible without the….
journals.aps.org
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...
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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):.
A new preprint on a quantum-inspired classical algorithm for efficient calculations based on a quantum field theory.
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We also have a TDVP package that’s almost done - you can already use it now
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To learn how to set up your own time-evolution code, see our tutorial here:
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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)
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RT @rgmelko: Our first code tutorial for ML(QC)2 @NorditaSweden featuring @giactorlai and the @ITensorLib based quantum circuit simulator P….
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RT @nibaldelli: Two weeks ago I finished my internship at @FlatironCCQ working on the superconducting properties of the t-t’ Hubbard model….
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The ITensor Paper is published! Nice to see other leading software efforts e.g. @NetKetOrg) also publishing in SciPost Codebases.
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).@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):.
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. Check out its first publication: the ALF project 2.0 (Assaad et al.)
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