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When debugging code with no qubits, quantum state in Variables view is reported as |0> #1922

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tcNickolas opened this issue Sep 18, 2024 · 0 comments · Fixed by #1953
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When debugging code with no qubits, quantum state in Variables view is reported as |0> #1922

tcNickolas opened this issue Sep 18, 2024 · 0 comments · Fixed by #1953
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Describe the bug

When I debug code that doesn't have qubits allocated, the "Q# Circuit" panel correctly says "No qubits have been allocated", but the Quantum State is shown as |0> which corresponds to one qubit.

To Reproduce

Debug any operation that doesn't allocate qubits (for example, calculates classical values before anything quantum).

Expected behavior

No state shown - either no fields under "Quantum State", or a message saying "No qubits have been allocated"

System information

  • QDK 1.8.0
@tcNickolas tcNickolas added bug Something isn't working needs triage labels Sep 18, 2024
@swernli swernli self-assigned this Oct 8, 2024
swernli added a commit that referenced this issue Oct 8, 2024
@swernli
Show no quantum state when debugging code with no qubits
70fbb57 
Instead of showing a single bit zero state, this change makes the debugger quantum state view show a message when no qubits are allocated on the system:

Fixes #1922
This was referenced Oct 8, 2024
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github-merge-queue bot pushed a commit that referenced this issue Oct 16, 2024
@swernli
Show no quantum state when debugging code with no qubits (#1953)
2856c76 
Instead of showing a single bit zero state, this change makes the
debugger quantum state view show a message when no qubits are allocated
on the system:

![image](https://github.com/user-attachments/assets/25612e0f-a886-4396-b729-db5b90a7c160)

Fixes #1922
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Show no quantum state when debugging code with no qubits microsoft/qsharp
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@tcNickolas @swernli