pygsti.tools.optools.operation_from_error_generator

operation_from_error_generator(error_gen, target_op, mx_basis, typ='logG-logT')

Construct a gate from an error generator and a target gate.

Inverts the computation done in error_generator() and returns the value of the gate given by gate = target_op * exp(error_gen).

Parameters:

• error_gen (ndarray) – The error generator matrix

• target_op (ndarray) – The target operation matrix

• mx_basis ({'std', 'gm', 'pp', 'qt'} or Basis object) – The source and destination basis, respectively. Allowed values are Matrix-unit (std), Gell-Mann (gm), Pauli-product (pp), and Qutrit (qt) (or a custom basis object).

• typ ({"logG-logT", "logG-logT-quick", "logTiG", "logGTi"}) –

  The type of error generator to invert. Allowed values are:

  • ”logG-logT” : gate = exp( errgen + log(target_op) ) using internal logm

  • ”logG-logT-quick” : gate = exp( errgen + log(target_op) ) using SciPy logm

  • ”logTiG” : gate = dot( target_op, exp(errgen) )

  • ”logGTi” : gate = dot( exp(errgen), target_op )

Returns:

The operation matrix.

Return type:

ndarray