current version of cudaq.draw throws error if kernel uses exp_pauli

[poojarao8]

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Describe the bug

import cudaq

kernel = cudaq.make_kernel()
qubits = kernel.qalloc(2)
kernel.x(qubits[0])
kernel.h(qubits[1])
kernel.exp_pauli(0.5, qubits, 'XY')

print(cudaq.draw(kernel))

Using cudaq version with hash e1d340b7d5bbcf5ec97230be416ba02c8a453b39 the code snippet above does not throw an error (although it only prints the x and h gate, doesn't print anything for exp_pauli)

Using the most recent version with hash a674f66c922ff60f4b8f7cad730a321d73c84d88 the code snippet throws the following error: RuntimeError: [custatevec] %initialization error in applyExpPauli (line 569)

If the print(cudaq.draw(kernel)) is replaced with cudaq.sample(kernel) the code completes successfully. In other words, i've isolated this to the draw function when exp_pauli is in the kernel. This was reported by @hosseinberg.

Steps to reproduce the bug

import cudaq

kernel = cudaq.make_kernel() qubits = kernel.qalloc(2) kernel.x(qubits[0]) kernel.h(qubits[1]) kernel.exp_pauli(0.5, qubits, 'XY')

print(cudaq.draw(kernel))

Expected behavior

Print the circuit with the exp_pauli gate expansion included.

Is this a regression? If it is, put the last known working version (or commit) here.

Error is new/functionality was never there before

Environment

source-sha: a674f66c922ff60f4b8f7cad730a321d73c84d88 cuda-quantum-image: nvcr.io/nvidia/nightly/cuda-quantum@sha256:0b49326508307b1315da3edbe1874227026113c0f1952da72fd59360e2e5d3a4 cuda-quantum-dev-image: ghcr.io/nvidia/cuda-quantum-dev@sha256:22e596895f45ede61b7031d4187bc7e64c1398c031f3c0f80410053454239d01 cuda-quantum-devdeps-image: ghcr.io/nvidia/cuda-quantum-devdeps@sha256:fd564e53e18265a6877854eb239f1ee430778eab035b3606c034b70a1086511a platforms: linux/arm64,linux/amd64 nvidia-mgpu-repo: cuda-quantum/cuquantum-mgpu.git nvidia-mgpu-commit: 59b8ed189989d6d2d944e41d8fbc5881b289c83c

asset-name: image_publishing.txt release-id: 9971709394_image_publishing artifacts-url: https://api.github.com/repos/NVIDIA/cuda-quantum/actions/runs/9966005679/artifacts data-commit: 0d8f95bcbda57c87dd2e68cd49fe75e11b45f301 gitlab-pipeline: https://gitlab-master.nvidia.com/nvhpc/cuda-quantum/-/pipelines/16668003

Suggestions

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