The InitialState command accepts a positive integer indicating the number of qubits.

The InitialState command returns an initial state with all qubits in the lower (or 0) state.

The optional boolean keyword dirac determines whether the initial state is returned in Dirac notation (true) or Array notation (false).

In Dirac notation the number of qubits is represented by the number of indices on the wave function symbol; in Array notation the number of qubits is represented by the number of dimensions of the Array.

The two states of each qubit are denoted as 0 and 1 in Dirac notation; they are represented by the range 1..2 of each dimension in Array notation.

$\mathrm{with}\left(\mathrm{QuantumChemistry}\right)\:$

$\mathrm{with}\left(\mathrm{QuantumComputing}\right)\;$

$\left[\mathrm{ConvertDirac}\,\mathrm{Gate}\,\mathrm{InitialState}\,\mathrm{MeasureState}\,\mathrm{PrepareState}\,\mathrm{QubitPopulations}\,\mathrm{QubitPopulationsPlot}\right]$

$\mathrm{state0} ≔ \mathrm{InitialState}\left(4\right)\;$

$\mathrm{state0}≔{\mathrm{\Psi }}_{0,0,0,0}$

$\mathrm{state0} ≔ \mathrm{InitialState}\left(4\, \mathrm{dirac}\=\mathrm{false}\right)\;$