DensityMatrix.from_label¶
- classmethod DensityMatrix.from_label(label)[source]¶
Return a tensor product of Pauli X,Y,Z eigenstates.
Table 16 Single-qubit state labels¶ Label
Statevector
"0"\(\begin{pmatrix} 1 & 0 \\ 0 & 0 \end{pmatrix}\)
"1"\(\begin{pmatrix} 0 & 0 \\ 0 & 1 \end{pmatrix}\)
"+"\(\frac{1}{2}\begin{pmatrix} 1 & 1 \\ 1 & 1 \end{pmatrix}\)
"-"\(\frac{1}{2}\begin{pmatrix} 1 & -1 \\ -1 & 1 \end{pmatrix}\)
"r"\(\frac{1}{2}\begin{pmatrix} 1 & -i \\ i & 1 \end{pmatrix}\)
"l"\(\frac{1}{2}\begin{pmatrix} 1 & i \\ -i & 1 \end{pmatrix}\)
- Parameters
label (string) – a eigenstate string ket label (see table for allowed values).
- Returns
The N-qubit basis state density matrix.
- Return type
- Raises
QiskitError – if the label contains invalid characters, or the length of the label is larger than an explicitly specified num_qubits.