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### Environment
- **Qiskit version**: 1.2.4
- **Python version**: 3,11
- **Operating system**: Ubuntu 24.04.1 LTS
### What is happening?
When calculating the matrix representation of a `SparsePauli…
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## Efficient Classical Weak Simulation of Quantum Circuits with Positive Discrete Wigner Representation
_Hi, Andrew! Hope this catches your interest._
_@krastanov, pinging in case you’d like to …
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I would like to have a "J" matrix that works similar to uniform scaling. So if I have a matrix `A=rand(4,4)` for example, I can just write `A*JMatrix` for example, instead of having to explicitly defi…
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```
Tao> set ele ip6__1 mat6_calc_method = tracking
[WARNING] twiss_from_mat6:
1-TURN MATRIX MARGINALLY SYMPLECTIC WITH SYMPLECTIC ERROR OF: 0.0111
```
[esr.txt](https://github.com/bmad…
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**Describe the bug 🐞**
`enumerate_clifford_slow(n, i, ;...)` gives a canonical mapping from integer to symplectic group `Sp(2n)`. This algorithm is based on generalized Gram-Schmidt orthogonalizati…
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#1076 is introducing in qibo a way for simulating clifford circuits efficiently, several improvements can still be introduced on top of that though:
- [x] Currently the ``CliffordBackend`` is backend…
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Attempted in PR https://github.com/xsuite/xtrack/pull/325
Needs further investigation by @pkruyt and @xbuffat
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After discussion with @aniemeyer and @danielrademacher we think it would be important to have constructors for conformal orthogonal groups. We could just add them to `forms` (say in `lib/classical.gi`…
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Currently the docstring for the abstract type `Basis` states
```
The Basis class is meant to specify a basis of the Hilbert space of the
studied system. Besides basis specific information all subcl…
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Here is my numerical problem: I want to compute a Hamiltonian square root of a given skew-Hamiltonian matrix.
The following article [Structure-Preserving Schur Methods for Computing Square Roots of…