Editing Quantum Gate Set Tomography (section)

==Properties==

* Figure of merit: Gate set
* Multiple copies of the quantum state are required in this method.
* <math>E_j</math> should be tomographically complete.
* In contrast to QPT, it is not possible in GST to characterize one gate at a time. Instead, GST estimates every gate in the gate set simultaneously.
* SPAM gates are included in the gate set for self-consistency.
* The limitation of linear-inversion GST (or LGST) is that it does not constrain the estimates to be physical. However, LGST provides a convenient method for diagnosing gate errors and also gives a good starting point for the constrained maximum likelihood estimation.
* In the gate set, the first gate is generally selected to be the null gate.
* The simulated errors are of three different types, representing coherent and incoherent gate errors as well as intrinsic SPAM errors.