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.
|
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