<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the principle of superposition in quantum mechanics? Context: The principle of superposition in quantum mechanics means that a system can exist in multiple states at once until observed. Answer: [/INST]The principle of superposition states that a physical system exists in all theoretically possible states simultaneously until it is measured.</s>