Hello All,

I have a question regarding calculating the entanglement entropy (EE) of a subregion. Let’s say I want to calculate EE of subsytstem A for case A and B shown below.

For case A, this calculation of EE is carried out by using ‘orthogonalize’ and ‘svd’. The example is shown here: (MPS and MPO Examples · ITensors.jl)

In case B where subsystem A is relocated to the middle of the chain. My question is: how do I compute the EE in this case ? Is ‘svd’ still viable in this case ? I hope someone can enlight me in some way. Thank you !