qiskit.quantum_info.entropy

entropy(state, base=2)

Calculate the von-Neumann entropy of a quantum state.

The entropy \(S\) is given by

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

매개변수

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

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

반환

The von-Neumann entropy S(rho).

반환 형식

float

예외 발생

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