IQM reset operation not working

[zohimchandani]

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Describe the bug

reset operation is not being passed properly between CUDA-Q and IQM

Steps to reproduce the bug

if stim is changed to iqm hardware in this tutorial above, we get the following error:

"error: 'quake.reset' op unable to translate op to IQM Json quake.reset" coming from the line "dem = qec.z_dem_from_memory_circuit(surface_code, statePrep, nRounds)"

side note: the simulation uses a noise model which we believe is automatically removed when executed on hardware

Expected behavior

NA

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

Not a regression

Environment

• CUDA-Q version: latest
• Python version:
• C++ compiler:
• Operating system:

Suggestions

No response

[zohimchandani]

@iqm-bhoffmann
@d-bulmash
@bmhowe23

[zohimchandani]

@anpaz

[anpaz]

The error is produced in the file cudaq/lib/Optimizer/CodeGen/TranslateToIQMJson.cpp. This file is responsible for translating CUDA-Q operations to the IQM JSON format.

From the code, only a specific set of operations are supported for IQM JSON output—primarily "z" and "phased_rx" gates, and measurement (quake.mz). There is no handler for the "quake.reset" operation in this translation logic. When the translation encounters an operation it doesn't recognize (like "quake.reset"), it emits the error you are seeing.

So, the error is triggered in TranslateToIQMJson.cpp when the translation logic hits a quake.reset operation, because there is no emitOperation overload for quake.reset, nor is it included in the list of supported operations for IQM JSON.

If IQM supports reset, we would be happy to accept a contribution for this. All that is needed is to update TranslateToIQMJson.cpp to generate the instruction corresponding to quake.reset with its corresponding tests, and send a PR for this.

[anpaz]

For more information about how to make a contribution, take a look at https://github.com/NVIDIA/cuda-quantum/blob/main/Contributing.md