Questions tagged [deferred-measurement]

The "principle of deferred measurement" refers to the idea that in almost all cases measurement may be performed as a last step in a quantum computation. This tag is dedicated to questions that explore the concept and/or potential exceptions to the concept.

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10 votes
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Are there any algorithms that take measurements in an intermediate step?

As a beginner in quantum computation, I noticed that all quantum algorithms take various gates followed by measuring the qubits in the last step. Is it always the case? Are there any algorithms that ...
John Wong's user avatar
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7 votes
1 answer

What is a proof for the principle of deferred measurement?

Does anyone know of a proof for the 'principle of deferred measurement'?
Quantum Guy 123's user avatar
3 votes
2 answers

what does it mean to "measure a qubit" if measurement is defined on operators

As far as I know "measurement" depends on the two variables : state and operator. So what exactly does measuring a qubit mean? is it implied that the operator is the $Z$ operator on that ...
unknown's user avatar
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