We're celebrating World Quantum Day 2022! Join us

cirq.qis.von_neumann_entropy

Calculates the von Neumann entropy of a quantum state in bits.

cirq.qis.von_neumann_entropy(
    state: 'cirq.QUANTUM_STATE_LIKE',
    qid_shape: Optional[Tuple[int, ...]] = None,
    validate: bool = True,
    atol: float = 1e-07
) -> float

If state is a square matrix, it is assumed to be a density matrix rather than a (pure) state tensor.

state The quantum state.
qid_shape The qid shape of the given state.
validate Whether to check if the given state is a valid quantum state.
atol Absolute numerical tolerance to use for validation.

The calculated von Neumann entropy.

ValueError Invalid quantum state.