qiskit.quantum_info.purity¶
- purity(state, validate=True)[fuente]¶
Calculate the purity of a quantum state.
The purity of a density matrix \(\rho\) is
\[\text{Purity}(\rho) = Tr[\rho^2]\]- Parámetros
state (Statevector or DensityMatrix) – a quantum state.
validate (bool) – check if input state is valid [Default: True]
- Devuelve
the purity \(Tr[\rho^2]\).
- Tipo del valor devuelto
float
- Muestra
QiskitError – if the input isn’t a valid quantum state.