Estimating the T2* dephasing time

We will estimate the T2* dephasing time based on the experiment results from t2star_circuits executed on a noisy device. We will use the probability formula of measuring 0 from the following equation, where A, T2*, f, , and B are unknown parameters:

The T2StarFitter parameters are the same, with the exception of the following:

• fit_p0: The initial values to the fit parameters – in order, A, T2*, f, , B.
• fit_bounds: The lower and upper bounds, respectively. Parameters in order: A, T2*, f, , B

The following code will set the initial parameter values so that we can generate our T2StarFitter and bounds:

# Set the initial values of the T2StarFitter parameters
param_T2Star = t2Star*1.1
param_A = 0.5
param_B = 0.5
# Generate the T2StarFitter with the given parameters and # bounds
fit = T2StarFitter(backend_result, delay_times, qubits,
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