qiskit.quantum_info.entropy

entropy(state, base=2)

Calculate the von-Neumann entropy of a quantum state.

The entropy \(S\) is given by

\[S(\rho) = - Tr[\rho \log(\rho)]\]

Parâmetros

• state (Statevector or DensityMatrix) – a quantum state.

• base (int) – the base of the logarithm [Default: 2].

Retorna

The von-Neumann entropy S(rho).

Tipo de retorno

float

Levanta

QiskitError – if the input state is not a valid QuantumState.