NVIDIA / NVIDIA/cuda-quantum

Drawing conditional measurement operations

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bug enhancement stale-notified
Dominant language
C++
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Forks
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Merged PRs (30d)
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Description

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Describe the bug

Drawing functionality does not plot out mid circuit measurements:

@cudaq.kernel 
def kernel(): 
    
    qubits = cudaq.qvector(3)
    
    h(qubits[0])
    
    m1 = mz(qubits[0])
        
    if m1 == 1: 
        z(qubits[2])
    

Image

In this circuit, the z gate is only applied if the measurement result is 1.

This is how conditional gates are represented in literature:

Image

Steps to reproduce the bug

NA

Expected behavior

NA

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

Not a regression

Environment
  • CUDA Quantum version:
  • Python version:
  • C++ compiler:
  • Operating system:
Suggestions

No response

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the Python kernel example in the issue and inspect the existing circuit-drawing entry point to determine how mid-circuit measurements and conditional gates are represented. Done means the measurement and its conditional z gate are visibly represented in the drawn circuit, with coverage for the shown case.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp, python
Domain
data-visualization, quantum-computing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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