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Return the s+ operator.
openfermion.hamiltonians.s_plus_operator(
n_spatial_orbitals: int
) -> openfermion.ops.FermionOperator
\[ \begin{align} S^{+} = \sum_{i=1}^{n} a_{i, \alpha}^{\dagger}a_{i, \beta} \end{align} \]
Args | |
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n_spatial_orbitals
|
number of spatial orbitals (n_qubits + 1 // 2). |
Returns | |
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| 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.