How can I put the unitary matrix $$e^\frac{i\pi}{2}I$$ to the quantum circuit?
I don't know if it is belong to $$U3(\theta, \phi, \lambda), U2(\phi, \lambda), U1(\lambda)$$
Thanks a lot.
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Sign up to join this community$I$ is the identity matrix. In a quantum circuit, it means "do nothing". You don't need to program it in. The global phase doesn't make a difference to this either.