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#### Issue description
when i use the lightning.qubit device i got the error below i already install `pennylane-lightning` latest version.
#### Source code and tracebacks
```python
import penny…
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**Describe the bug**
It seems like the numpy interface for the density simulator has a limit of 14 Qubits.
**To Reproduce**
Code sample that fails:
```
from qml_essentials.model import Model
…
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### Expected behavior
When using `PrepSelPrep` in a circuit, differentiation with autograd and torch should give the same result:
```python
import pennylane as qml
from pennylane import numpy …
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I can't pass the mpitests with cmd "mpirun -np 2 -env UCX_NET_DEVICES=eth0 python -m pytest mpitests --tb=short" and cmd "mpirun -np 2 python -m pytest mpitests --tb=short".
**The pytest return th…
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#### Issue description
Lightning does not support measuring `qml.state` when `diff_method="adjoint"`.
* *Expected behavior:* QNodes running on lightning can return `qml.state` when `diff_method=…
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### Expected behavior
```python
with qml.tape.QuantumTape() as temp_go:
qml.CNOT([1, 2])
qml.CNOT([0, 1])
qml.CNOT([2, 3])
qml.CNOT([1, 2])
qml.CNOT([2, 3])
qm…
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### Expected behavior
Hi,
I have a simple example using "default.qubit" device and I would like to specify c_dtype to be {np.complex64, np.complex128}
### Actual behavior
I have 2 problems:
1.…
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#### Issue description
PennyLane Lightning encounters a "filesystem error" when tryi…
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We are currently researching quantum simulation and discovered that PennyLane-Lightning-Tensor supports cutensornet as a backend. After installing lightning-tensor and running the example code provide…
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### Feature details
In the context of VQE, I am wondering whether in Pennylane it is a hard requirement that all unitaries must be defined over qubits, or if it's possible to optimize a cost functi…