Reduced density matrix of nonadjacent sites

[miles]

@ryanlevy recently introduced a new ITensor Entropy Tools package. One of its main features is efficiently computing rdms. Does it help with the case you wanted?

See post below:

Introducing ITensorEntropyTools.jl

Introducing a new 3rd party package to compute entanglement entropy ITensorEntropyTools.jl: Features The idea behind ITensorEntropyTools.jl is to automate some common calculations/tools: Entanglement Entropy calculations von Neumann and Rényi Bipartite regions Arbitrary (potentially-disconnected) regions Automatic calculation of (potentially) minimal rank RDMs Mutual information Tripartite mutual information Experimental Support ITensorNetworks.jl (see network branch) Entanglement negat…