Why is relative phase important?

Question: Why can relative phase matter in a quantum circuit? A) It changes the physical size of the processor B) It prevents qubits from being initialized C) It always makes measurement impossible D) It can affect later interference and therefore final measurement probabilities Correct: D Explanation: Relative phase changes the relationship between components of a quantum state. Later gates can convert these phase differences into different measurement probabilities. Topic: quantum computing / relative phase / interference