add dagger of a gate to the circuit

[danielmpla]

Hi,

how would I add the dagger of a gate to the circuit?

For me it is not clear from the Tutorial. I assumed it would be e.g. circuit.csum([reg[i], reg[t]]).dag(), however in circ.instructions[0].__array__() the non-dagger version is added.

Regards, Daniel

[KevinMTO]

Hi Daniel, thanks for looking into it. The correct method is to use to_matrix(identity=[0,1,2]), a specific flag choice will give you a specific unitary.

• 0 : is the unitary (dagger or not) of the interaction on one or two lines.
• 1: is the unitary of 0 with identities on the lines between the target and control in case of entangling operation.
• 2: is the unitary of the operation on the whole circuit.

__array__() is a magic function to generate the unitary, shouldn't be used. let me know if this helps :)