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There is already a function in `sympy.calculus.euler.euler_equations` that gets the set of Euler-Lagrange equations for a given Lagrangian.
I believe we should have a corresponding function that take…
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Hi,
Noob here. Tried to time-evolve a TB Hamiltonian for spinless fermions, strting from a half-filled state
```python
import fqe
from openfermion import FermionOperator,hermitian_conjuga…
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Is there a way to create spatial-dependent Hamiltonian?
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; also the fact that the XXZ Hamilto…
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Collecting the "dm1b" estimator on a VMC calculation of FeO with a single determinant PBE orbital basis with no Jastrow factor should produce a diagonal density matrix. This system contains 22 electro…
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Because model WrightSim Hamiltonians have a specific size and number of non-zero elements, it is possible to create and compile a low-level matrix-vector multiplication method to be used in WrightSim …
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[From the [forum here](https://itensor.discourse.group/t/vumps-mpo-error/1660/) ]
The following OpSum appears to break the code due to a single Op not being wrapped into a `sum`
```julia
function …
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### Feature details
To be able to compute gradients w.r.t state output, or at least being able to use qml.math.fidelity(state1,state2).
In the documentation for [qml.math.fidelity](https://docs.…