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@scemama is there a way to compute the PT2 deterministically in QP2?
In our tests, are we comparing to the stochastic PT2 value?
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Hi all,
I found a strange convergence issue of DMRG, which I wanted to share with you.
At the moment I'm not sure where it comes from, and I'm investigating it further.
The problem occurs even in t…
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Dear Colleagues
I am very much interested in making use of mrchem.
However I cannot compile libgetkw on ubuntu 18-10!
I proceeded as follows.
I cloned MRchem , MRcpp and libgetkw from their …
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The point we hope to make is that we can implement the single-particle hamiltonian with an nstep derivative. But we need to be extremely careful---if we define the kinetic energy for each particle wi…
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I'm setting up the exact diagonalization of a heisenberg model with external fields.
The definition of the model:
```
totalSz = 1
L =8
sigmaz = np.array([[1,0],[0,-1]])
pars['Hilbert'] = {
…
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**Submitting author:** @nquesada (Nicolás Quesada)
**Repository:** https://github.com/xanaduAI/thewalrus
**Version:** v0.10.1
**Editor:** @katyhuff
**Reviewers:** @amitkumarj441, @poulson
**Archiv…
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I tried looking for this within the Pandoc's docs. None of the flavours of markdown tables support column spanning. I don't think there are known markdown flavours that support column spanning except …
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Dear colleges!
I get the problem with plateau on the learning curve when I try to fit the Ising model for short-chain (4-12 spins in the chain) systems.
For example [here](https://raw.githubuserco…
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With a few tweaks, the NetKet infrastructure can be used to perform exact diagonalization on small quantum problems.
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Hello everyone!
Are there (in QuSpin) any approximation techniques to simulate systems?
May be there are methods to compute ground states only?
For example, I want to calculate the ground energy on…