{ }
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Return the s+ operator.
openfermion.hamiltonians.special_operators.s_minus_operator(
n_spatial_orbitals: int
) -> openfermion.ops.FermionOperator
\[ \begin{align} S^{-} = \sum_{i=1}^{n} a_{i, \beta}^{\dagger}a_{i, \alpha} \end{align} \]
Args | |
---|---|
n_spatial_orbitals
|
number of spatial orbitals (n_qubits + 1 // 2). |
Returns | |
---|---|
operator
|
FermionOperator
corresponding to the s- operator over n_spatial_orbitals. |
Note | |
---|---|
The indexing convention used is that even indices correspond to spin-up (alpha) modes and odd indices correspond to spin-down (beta) modes. |