Quantum Measurement & Reset Operations | Wavefunction Collapse
Quick Technical Answer:
Quantum measurement projects a continuous superposition state into one of the discrete basis states (|0⟩ or |1⟩) according to the Born rule P(i) = |⟨i|ψ⟩|², irreversibly collapsing the wavefunction. Reset forces the qubit back to |0⟩.
Formula / Unitary:
P(m) = \langle\psi| M_m^\dagger M_m |\psi\rangle, \quad |\psi_{\text{post}}\rangle = \frac{M_m |\psi\rangle}{\sqrt{P(m)}}
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Frequently Asked Questions
What is mid-circuit measurement?
Mid-circuit measurement measures a subset of qubits during circuit execution while preserving coherence on unmeasured qubits, which is mandatory for syndrome extraction in quantum error correction.