📏 Measurement Operations
Discover how quantum measurements collapse superpositions and extract classical information
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0 / 5 completed🎯 What is Quantum Measurement?
Quantum measurement is the process of extracting classical information from quantum states. Unlike passive classical observation, quantum measurement actively changes the system, collapsing superpositions into definite outcomes.
⚡ The Measurement Postulate
When measuring a qubit in state |ψ⟩ = α|0⟩ + β|1⟩, you get outcome |0⟩ with probability |α|² and |1⟩ with probability |β|². After measurement, the state irreversibly collapses to the observed outcome.
Probabilistic Nature
Measurement outcomes are fundamentally random, governed by quantum amplitudes
State Collapse
Superposition vanishes upon measurement, leaving only one classical outcome
Born Rule
Probability = |amplitude|² connects quantum and classical worlds
Irreversibility
Cannot recover the original superposition after measurement
📝 Measurement Example
💡 Key Insight
Measurement is the bridge between quantum and classical worlds. While quantum gates are reversible and preserve information, measurement is irreversible and destroys quantum coherence—making it both the most powerful and most destructive quantum operation.