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### Expected behavior
Here is a minimal example with `v0.26`:
```python
U = qml.PauliX.compute_matrix() * (1.0j)
def subcircuit():
qml.ControlledQubitUnitary(U @ U, control_wires=1, wires…
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Ideally, when a user wants to return counts but forgets to set counts, the error message would point to that. Currently the error message is somewhat cryptic:
```python
dev = qml.device("default.q…
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### Environment
- **Qiskit Terra version**: 0.23.0
- **Python version**: 3.9
- **Operating system**: MacOS
### What is happening?
Together with @Cryoris, we noticed that if the `IMAG` opt…
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> > I have observed (with great delight!) that tape mode now allows observables returning non-standard types beyond floats, e.g., dicts or classes.
>
> I am also pleasantly surprised, this was not s…
cvjjm updated
2 years ago
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As `IsingXY` gate is being added to PennyLane (https://github.com/PennyLaneAI/pennylane/pull/2649), we need to check it does not break forward/backward computation in Lightning. Otherwise, we need to …
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### Expected behavior
For a QAOA max cut problem, here I am comparing the qnode results from 4 different devices:
1. lightning.qubit shots=None
2. lightning.gpu shots=None
3. lightning.gpu shots…
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It might be nice to have a method that can calculate the Von Neumann entropy of some arbitrary state.
I've come across a few papers where a variant of "free energy" is used as a loss function for …
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When I run the following code using Amazon Braket SDK on my local ARM processor I get the error message: botocore.errorfactory.AccessDeniedException: An error occurred (AccessDeniedException) when cal…
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#### Issue description
On the right side of the screen when you open a demo it gives you the option to download the notebook. It has been detected that the notebook generated in several demos does …
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Qulacs can support GPU. Is it possible to run pennylane-qulacs with GPU?