mindquantum.core.operators.number_operator

mindquantum.core.operators.number_operator(n_modes=None, mode=None, coefficient=1.0)

Return a fermionic number operator for the reverse_jordan_wigner transform.

Parameters

• n_modes (int) – The number of modes in the system. Default: None.

• mode (int, optional) – The mode on which to return the number operator. If None, return total number operator on all sites. Default: None.

• coefficient (float) – The coefficient of the term. Default: 1.0.

Returns

FermionOperator, a fermionic number operator for the reverse_jordan_wigner transform.

Examples

>>> from mindquantum.core.operators import FermionOperator, number_operator
>>> n_mode = 3
>>> number_operator(n_mode)
1 [0^ 0] +
1 [1^ 1] +
1 [2^ 2]
>>> mode = 3
>>> number_operator(None, mode)
1 [3^ 3]