# Concrete Examples of Quantum Gates

DevFeed: [Concrete Examples of Quantum Gates](<https://devfeed.tech/articles/concrete-examples-of-quantum-gates-40395.md>)

Original publisher: [Read original article](<https://www.jeremykun.com/2016/01/11/concrete-examples-of-quantum-gates/>)

Published: 2016-01-11T14:05:22Z

Content type: tutorial

Language: en

Sources: [Jeremy Kun](<https://devfeed.tech/sources/jeremy-kun.md>)

Topics: [circuit](<https://devfeed.tech/topics/circuit.md>)

Tags: [circuit](<https://devfeed.tech/tags/circuit.md>), [circuits](<https://devfeed.tech/tags/circuits.md>), [linear-maps](<https://devfeed.tech/tags/linear-maps.md>), [mathematics](<https://devfeed.tech/tags/mathematics.md>), [matrices](<https://devfeed.tech/tags/matrices.md>), [python](<https://devfeed.tech/tags/python.md>), [quantum](<https://devfeed.tech/tags/quantum.md>), [quantum-computing](<https://devfeed.tech/tags/quantum-computing.md>)

## AI overview

A quantum-computing tutorial explains how local quantum gates affect the full state vector of a multi-qubit register, using a three-qubit swap-gate example.

## Source excerpt

So far in this series we've seen a lot of motivation and defined basic ideas of what a quantum circuit is. But on rereading my posts, I think we would all benefit from some concreteness. "Local" operations So by now we've understood that quantum circuits consist of a sequence of gates $ A_1, \dots, A_k$, where each $ A_i$ is an 8-by-8 matrix that operates "locally" on some choice of three (or fewer) qubits.