entropy¶
- entropy(state, base=2)[source]¶
Calculate the von-Neumann entropy of a quantum state.
The entropy \(S\) is given by
- Parameters
state (Statevector or DensityMatrix) – a quantum state.
base (int) – the base of the logarithm [Default: 2].
- Returns
The von-Neumann entropy S(rho).
- Return type
float
- Raises
QiskitError – if the input state is not a valid QuantumState.