I've been looking at the graphs of various Quantum Processors on IBM-Q experience and for qubits, frequency of different qubits is the first statistic shown.

From this in the Qiskit textbook:

The qubit frequency is the difference in energy between the ground and excited states, which we label the $|0\rangle$ and $1\rangle$ states, respectively. This frequency will be crucial for creating pulses which enact particular quantum operators on the qubit -- the final goal of our calibration!

It makes sense that being able to distinguish between different states is rather important.

My question is how the differing frequencies for the different qubits affects results. Are the gates applied all equal, with some qubits more susceptible to bit flips as a result? Or are gates calibrated to qubits ? For running experiments on IBM-Q what must be kept in mind ?


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