David Ittah

**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...

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...

**Context** Catalyst uses a source-to-source transformation package called [AutoGraph](https://docs.pennylane.ai/projects/catalyst/en/stable/dev/autograph.html), which allows users to write regular Python code that is automagically transformed into JAX-style traceable code. For example, the following for...

For compatibility reasons, the diff method in catalyst is set to `parameter-shift` when the user selects `diff_method="best"`. The performance will generally suffer significantly on simulators as a result of this....

Performance degradation with vmap and large data

1

I ran across a problem that I thought was a non-terminating program, but turns out to be severe performance degradation when using vmap on large amounts of data, such as...

Failing to erase fictitious PHI nodes

1

**Context:** I'm currently investigating some issues differentiating MLIR-generated LLVMIR with Enzyme. Our pipeline roughly consists of `*Dialects -> LLVMDialect -> LLVMIR -> O2 -> Enzyme`. While investigating, I decided to...

Enzyme warns `freeing without malloc` on allocated pointers

1

**Context:** I'm not sure whether this is a bug or I'm not understanding what Enzyme is warning me about, so some information on possible sources of the error would be...

Document the semantics of the QuantumDevice interface

3

This PR adds detailed descriptions of the semantics of each method in the `QuantumDevice` interface used by runtime plugins. **Looking for feedback on**: - whether the semantics make sense as...

Fix `get_cmain` for boolean function results

3

Currently the `get_cmain` and `compile_executable` functionality will error out if a boolean is returned. The fix is to include the appropriate c header for boolean support (since C99).

Error when using `jnp.roll` with QNode + Dynamic shapes

4

The following program fails: ```py from catalyst import * import pennylane as qml @qjit @qml.qnode(qml.device('lightning.qubit', wires=0)) def circuit(N: int): phase_divisors = jnp.arange(N) cumulative_phase = jnp.roll(phase_divisors, jnp.asarray(1)) return cumulative_phase print(circuit(2)) ```...