# Is there a way to within a quantum circuit work out if a qubit is in a superposition or not?

Preferably using the gates found in QASM/Qiskit and the qubit stays in the superposition and no measurement is made, i.e. the output of if it is in a superposition or not is a binary answer in another qubit.

• The short answer for a general superposition is no, you can‘t. To obtain information you have to measure and that will affect your qubit. – Cryoris May 28 at 8:26

$$|\psi⟩ = \frac{\alpha}{\sqrt{2}}|0⟩(|00⟩+|10⟩) + \frac{\beta}{\sqrt{2}}|1⟩(|11⟩+|01⟩)$$