How to initialize qubits in a specific state?

[ellow0rld]

I am trying to initialize qubits in a particular state. I noticed that there's a github issue discussing the same problem. I tried implementing the solution provided there. The function runs without errors when it's not called, but I encounter errors when I call it.

c = [.70710678, 0., 0., 0.70710678]
@cudaq.kernel
def test():
    q = cudaq.qvector(c)

No error when I run the above

c = [.70710678, 0., 0., 0.70710678]
@cudaq.kernel
def test():
    q = cudaq.qvector(c)

test()

But, when I call it, I get the following error

error: 'quake.alloca' op operand #0 must be signless integer, but got '!cc.stdvec'

I don't know why it's not working. Is it a version problem?

Specifications
I am running cudaq on VSCode, installed using Docker.

nvidia-smi

[bmhowe23]

Hi @ellow0rld - since #1086 will take many incremental updates to implement, the development is not being done in the main branch. Rather, it is being done in the https://github.com/NVIDIA/cuda-quantum/tree/experimental/stateHandling branch. You can experiment with this branch yourself by using the nvcr.io/nvidia/nightly/cuda-quantum:experimental-stateHandling-base Docker image. However, note that features may change quickly in that branch, and as such, it should be considered - in some sense - less stable than the main branch.

[ellow0rld]

Hi @bmhowe23 Thank you so much for the response. Will try experimenting the stateHandling branch!!

[efratshabtai]

@ellow0rld the state handling branch have been merged to main and released as part of 0.8.0 version, please try that and let us know if we can close this discussion.