cirq.google.XmonStepResult.state

XmonStepResult.state() → numpy.ndarray

Return the state (wave function) at this point in the computation.

The state is returned in the computational basis with these basis

states defined by the qubit_map. In particular the value in the

qubit_map is the index of the qubit, and these are translated into

binary vectors where the last qubit is the 1s bit of the index, the

second-to-last is the 2s bit of the index, and so forth (i.e. big

endian ordering).

Example

qubit_map: {QubitA: 0, QubitB: 1, QubitC: 2}

Then the returned vector will have indices mapped to qubit basis

states like the following table

| | QubitA | QubitB | QubitC |

+—+——–+——–+——–+

| 0 | 0 | 0 | 0 |

| 1 | 0 | 0 | 1 |

| 2 | 0 | 1 | 0 |

| 3 | 0 | 1 | 1 |

| 4 | 1 | 0 | 0 |

| 5 | 1 | 0 | 1 |

| 6 | 1 | 1 | 0 |

| 7 | 1 | 1 | 1 |

+—+——–+——–+——–+