Measurement of qubits results in collapsing the wavefunction/state in $|0\rangle$ or $|1\rangle$. I have a doubt about Parity Measurement (Source).

We entangle physical qubits with ancilla qubits by $\text{CNOT}$ gates, and then we measure ancilla qubits and then apply correction gate based on the measurement values of ancilla qubits.

I doubt that if other qubits are entangled with ancilla, if we measure ancilla, other qubits state should also collapse, resulting in losing the original state.

  • 2
    $\begingroup$ Have you tried simulating it or calculating it? $\endgroup$ Mar 19 at 19:31


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