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I am trying to study the effect of dynamical decoupling sequences (Hahn Echo and CPMG) using qiskit's qasm_simulator with an added noise model from ibm_lagos. While debugging, I realised that I needed the resonant frequency of the qubit to choose the delay times between the rotation gates. Following instructions from here: https://qiskit.org/documentation/tutorials/circuits_advanced/08_gathering_system_information.html, the resonant frequency is $5.23$ GHz. For sanity check, I ran the following circuit:The delay correcponds to 1/resonant frequency.

The delay corresponds to a time of 1/resonant frequency or a rotation of $\pi$ in the Bloch sphere. I expect to get measure the state $|1\rangle$ with unit probability. Instead, I get the state $|0\rangle$ with unit probability.

Does this implies that the qubit has no resonant frequency owing to the backend being a simulator? If yes, how do I model the system correctly? Or am I missing something?

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The qubit frequency is not encoded into the noise model. You can however attach noise to the delay gate. See here.

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