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Classic logic gates that are usually constructed using conventional semiconductor technology are subject to propagation delay, which means it takes some time for the output of a gate to reflect on its inputs.

Is that the case for quantum logic gates too? Is there a way to construct quantum logic gates, such as CNOT, with no propagation delay, for example using entanglement?

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Carrying out quantum gates (quantum operations) takes time. Otherwise, we could run computations in zero time.

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  • $\begingroup$ Thanks. So does this rule out the possibility of “spooky action”? I mean can we not make quantum gates whose outputs are entangled with their inputs so changes in inputs instantaneously change the outputs? $\endgroup$
    – Seyed
    Commented Feb 7, 2020 at 19:50

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