Quantum Computing Asked by Bidon on December 9, 2020
What is the best way to handle parametric circuits in Qiskit? When I create a variational form like TwoLocal
and then do var_form.parameters
it returns a set but that is an unordered structure so I fear that it will give me different results upon different calls.
Here is what I have:
var_form = TwoLocal(num_qubits=4,
rotation_blocks=["ry","rx"],
entanglement_blocks=["cx"],
entanglement="full",
reps=1,
skip_final_rotation_layer=False,
insert_barriers=True)
parameters=np.random.random(var_form.num_parameters)
param_dict={}
for i in range(var_form.num_parameters):
param_dict[list(var_form.parameters)[i]]=parameters[i]
Here is what I want:
def get_var_form(parameters):
"""parameters is a list like [0,1,2,3,4....]"""
##
# DO MAGIC HERE
var_form = TwoLocal(num_qubits=4,
rotation_blocks=["ry","rx"],
entanglement_blocks=["cx"],
entanglement="full",
reps=1,
skip_final_rotation_layer=False,
insert_barriers=True)
#I want to insert parameters----->var_form
##
return var_form #with given parameters
How can I do this?
This is what I came up with:
param_dict={}
for i in range(var_form.num_parameters):
param_dict[list(var_form.ordered_parameters)[i]]=parameters[i]
ansatz=var_form.bind_parameters(param_dict)
maybe its not the best way, but it works...
Answered by Bidon on December 9, 2020
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