1. The problem statement, all variables and given/known data Hey, the no-cloning theorem states, that arbitrary quantum states cannot be cloned by any circuit. It is, however, possible to clone orthogonal states. What would a circuit performing this action look like? 2. Relevant equations Relevant equations: I am assuming you all now the most important quantum gates (CNOT, Hadamard, Pauli Matrices etc. ) 3. The attempt at a solution The circuit looks like this: ##|\psi\rangle## is a general qubit: ##|\psi\rangle := a |0\rangle + b|1\rangle## I am assuming a CNOT gate has to be applied at some point, followed by the application of further gates to the lower qubit. I am, however, not sure how the coefficients can be "transferred" to the lower qubit. Thank you!