What is AIRouting doing step by step?

What is AIRouting doing step by step? Ask Question Asked 5 months ago Modified today Viewed 109 times 3 I am trying to understand how AIRouting tool from qiskit is optimal for routing. Therefore I am trying to understand its choice of swap/ie the sequence of action applied. From what I understand in the paper it is only adding swap gates and possibly cancelling or commuting gates. Random circuit: I feed a random cnot gates circuit that I optimize first using transpilation in "translation" mode. qc_translated = transpile(qc, basis_gates=['cx'], translation_method='translator') Circuit after optimization (based on transpile 'translation' mode): Then I apply AIRouting with minimal optimization : ai_routing = PassManager([AIRouting(backend_name="ibm_torino", backend=backend, optimization_level=1, layout_mode="optimize", local_mode=True,)]) routed_circuit = ai_routing.run(qc_translated) Routed circuit : When I get the result of the routing there are additional cnot gates (15 --> 17) and circuit doesn't seem to match with my original one. The level of optimization is at minimum 1 it, so it is probably due to some optimization that are added prior or after routing or even during it. How can I know what they are and how can I know what the AIRouting tool actually do step by step ? optimizationtranspile Share Improve this question Follow edited Nov 25, 2025 at 8:03 asked Nov 7, 2025 at 8:34 Maeru 312 2 bronze badges Add a comment 1 Answer Sorted by: Highest score (default) Date modified (newest first) Date created (oldest first) 0 The "Citation" section of the AI transpiling section of the documentation leads you to the preprint where you can look at the specific details of the implementation. The AIRouting pass uses a pretrained Reinforcement Learning (RL) agent to generate an equivalent circuit that respects the coupling map of the agent. It would be helpful if you clarify your question a bit more and add all the code of the specific case you mention, ideally using a code block (```). Share Improve this answer Follow answered Nov 13, 2025 at 20:53 javier 235 5 bronze badges Thank you for your answer ! I tried to clarify a bit, please tell me if it is not enough. So the reason the routed circuit isn't the initial circuit with additional swap gates is because AIRouting generates another equivalent circuit before routing ? Then is there a way to access this equivalent circuit in order to understand what is done during routing ie which swap are chosen step by step ? Otherwise is there to your knowledge a way to prevent this equivalent circuit to be used instead of the initial one ? –  Maeru Commented Nov 25, 2025 at 8:19 Add a comment Your Answer Sign up or log in Sign up using Google Sign up using Email and Password Post as a guest Name Email Required, but never shown Post Your Answer By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. Start asking to get answers Find the answer to your question by asking. Ask question Explore related questions optimizationtranspile See similar questions with these tags. The Overflow Blog Lights, camera, open source! 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