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Pure vs. mixed quantum states

📚 Probability arises in quantum mechanics every time we perform a measurement. However, probability also features more generally in science to describe systems for which we only have partial information. In this video, we consider what happens when we have a system for which we only have partial information, but this system is a quantum system. In these cases, we need to consider both types of probability, and to do so we use pure states and mixed states. 🐦 Follow me on Twitter:   / profmscience   ⏮️ BACKGROUND Measurements | Concepts:    • Measurements in quantum mechanics || Concepts   Measurements | Maths:    • Measurements in quantum mechanics || Mathe...   State collapse:    • State collapse in quantum mechanics   ⏭️ WHAT NEXT? Density operator for pure states:    • Density operator for pure quantum states   Density operator for mixed states:    • Density operator for mixed quantum states   ~ Director and writer: BM Producer and designer: MC