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Quantum error correction (QEC) is a collection of techniques to protect quantum information from decoherence and other quantum noise, to realise fault-tolerant quantum computation. Quantum error correction is expected to be essential for practical quantum computation in the face of noise on stored quantum information, faulty quantum gates, faulty state preparations, and faulty measurements. (Wikipedia)

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Where does error correction go in a quantum algorithm?

In an algorithm, there is no noisy channel per se. There are faulty gates causing errors each time they are applied. However, it's not completely disconnected, as you could model each faulty gate fo …
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Who is responsible for implementing quantum error correction?

A error correction mechanism (or error mitigation) is needed to lower the perceived noise. To do so, you apply the error correction procedure at a "lower" level than the level you use to perform the c …
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