mindquantum.core.operators.down_index

mindquantum.core.operators.down_index(index)

Down index getter function.

The index order, by default we set the spinless orbits as even-odd-even-odd (0,1,2,3,…). The spin_down orbitals (beta orbital) with index odd.

Parameters

index (int) – spatial orbital index.

Returns

int, the index of the associated spin-down orbital.

Examples

>>> from mindquantum.core.operators import down_index
>>> down_index(1)
3