cirq.qis.bloch_vector_from_state_vector

Returns the bloch vector of a qubit.

Calculates the bloch vector of the qubit at index in the state vector, assuming state vector follows the standard Kronecker convention of numpy.kron.

state_vector A sequence representing a state vector in which the ordering mapping to qubits follows the standard Kronecker convention of numpy.kron (big-endian).
index index of qubit who's bloch vector we want to find. follows the standard Kronecker convention of numpy.kron.
qid_shape specifies the dimensions of the qudits for the input state_vector. If not specified, qubits are assumed and the state_vector must have a dimension a power of two. The qudit at index must be a qubit.

A length 3 numpy array representing the qubit's bloch vector.

ValueError if the size of state_vectoris not a power of 2 and the shape is not given or if the shape is given and state_vector has a size that contradicts this shape.
IndexError if index is out of range for the number of qubits or qudits corresponding to state_vector.