# The Quantum Bit

DevFeed: [The Quantum Bit](<https://devfeed.tech/articles/the-quantum-bit-40373.md>)

Original publisher: [Read original article](<https://www.jeremykun.com/2014/12/15/the-quantum-bit/>)

Published: 2014-12-15T10:00:52Z

Content type: tutorial

Language: en

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

Topics: [Quantum Computing](<https://devfeed.tech/topics/quantum-computing.md>), [Computing](<https://devfeed.tech/topics/computing.md>), [circuit](<https://devfeed.tech/topics/circuit.md>)

Tags: [bits](<https://devfeed.tech/tags/bits.md>), [circuit](<https://devfeed.tech/tags/circuit.md>), [circuits](<https://devfeed.tech/tags/circuits.md>), [complex-numbers](<https://devfeed.tech/tags/complex-numbers.md>), [computing](<https://devfeed.tech/tags/computing.md>), [linear-algebra](<https://devfeed.tech/tags/linear-algebra.md>), [mathematics](<https://devfeed.tech/tags/mathematics.md>), [measurement](<https://devfeed.tech/tags/measurement.md>), [quantum](<https://devfeed.tech/tags/quantum.md>), [quantum-computing](<https://devfeed.tech/tags/quantum-computing.md>), [quantum-mechanics](<https://devfeed.tech/tags/quantum-mechanics.md>), [qubit](<https://devfeed.tech/tags/qubit.md>), [unitary-matrices](<https://devfeed.tech/tags/unitary-matrices.md>)

## AI overview

An introduction to quantum computing that extends classical circuit concepts to qubits. It defines a qubit as a unit vector in the complex plane of two dimensions and explains why extracting information from qubits differs from reading classical bits.

## Source excerpt

The best place to start our journey through quantum computing is to recall how classical computing works and try to extend it. Since our final quantum computing model will be a circuit model, we should informally discuss circuits first. A circuit has three parts: the "inputs," which are bits (either zero or one); the "gates," which represent the lowest-level computations we perform on bits; and the "wires," which connect the outputs of gates to the inputs of other gates.