qiskit.quantum_info.DensityMatrix.to_statevector¶
- DensityMatrix.to_statevector(atol=None, rtol=None)[ソース]¶
Return a statevector from a pure density matrix.
- パラメータ
atol (float) – Absolute tolerance for checking operation validity.
rtol (float) – Relative tolerance for checking operation validity.
- 戻り値
- The pure density matrix’s corresponding statevector.
Corresponds to the eigenvector of the only non-zero eigenvalue.
- 戻り値の型
- 例外
QiskitError – if the state is not pure.