 Here the so-called Dirac or “bra-ket” notion is used: where \(\ket{0}\) and \(\ket{1}\) are pronounced as “ket 0” and “ket 1”. The two vectors together form the computational basis \(\{\ket{0}, \ket{1}\}\), which defines a vector in a two-dimensional Hilbert space. A combination of n qubits is represented by a superposition vector in a \(2^n\) dimensional Hilbert space, e.g.: