Imaginary-part Hadamard test
= Imaginary-part Hadamard test
Adding a phase gate to the Hadamard test rotates the interference signal and measures the imaginary part of $\langle\psi|U|\psi\rangle$.
= Imaginary-part Hadamard test
Adding a phase gate to the Hadamard test rotates the interference signal and measures the imaginary part of $\langle\psi|U|\psi\rangle$.