catalyst

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Catalyst treats a density matrix measurement as a state measurement

4

#### Issue description Description of the issue - include code snippets and screenshots here if relevant. You may use the following template below * *Expected behavior:* (What you expect to...

albi3ro

**Context** We would like to run a small experiment of adding an [OpenQASM](https://docs.quantum.ibm.com/build/introduction-to-qasm) dialect in [MLIR](https://mlir.llvm.org/). Having a native representation of the OpenQASM standard available in MLIR would be beneficial...

dime10

I know this is on the backloag, but just adding it here. One comment from Ali is that scipy has changed symbols, so symbols that we are using from scipy...

erick-xanadu

This may lead to garbage memory being used or overwriting memory. I think this can be caught doing static type checking in MLIR. Probably during the lowering of backprop op.

erick-xanadu

Change `argnum` to `argnums`

1

Catalyst grad and jacobian use `argnum` instead of `argnums`. We should use `argnums` like JAX. Specially since `grad` and `jacobian` fall back to `jax.grad` and `jax.jacobian`.

erick-xanadu

Add local folding to ZNE error mitigation

4

**Requirements** The `mitigate_with_zne` function is modified to take a `folding` argument: ```python mitigate_with_zne(f, *, scale_factors: jax.Array, folding: str, deg) ``` where `folding` accepts a string corresponding to: - `global` (current...

josh146

Work in progress on eliminating large unitary matrices from circuits just because the control operator was used. The `Controlled` -> `QubitUnitary` decomposition was implemented way back when Catalyst only had...

dime10

We have a cache `mlir_fn_cache` that is placed just before lowering JAXPR to MLIR. I also want to add other caches. It would be nice to have a single function...

erick-xanadu

#### Issue description The cuda_quantum device uses the old device API, and as such can't use the newer updates to validation, decomposition, and other tape preprocessing. #### Additional information When...

lillian542

Catalyst raises `RuntimeError` when calculating a density matrix on a subset of wires

1

#### Issue description Description of the issue - include code snippets and screenshots here if relevant. You may use the following template below * *Expected behavior:* (What you expect to...

albi3ro