Beginner10 min read
Superposition & Measurement
Measurement is not a passive reading. It is the most violent thing you can do to a quantum state.
Before this: What Is a Qubit?
In this lesson you’ll learn
- Apply the Born rule to predict measurement statistics
- Explain what collapse does to a state and why it is irreversible
- Distinguish a coherent superposition from a probabilistic mixture
Recall before you read on
A qubit is prepared in the state (1/√3)|0⟩ + √(2/3)·|1⟩ and measured once in the computational basis. What is the probability the outcome is 1?
Commit to an answer — the next section is the payoff.