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|
Generates two-body positivity constraints on fermionic RDMs.
openfermion.measurements.two_body_fermion_constraints(
n_orbitals, n_fermions
)
The specific constraints implemented are known positivity constraints
on the two-fermion reduced density matrices. Constraints are generated
in the form of FermionOperators whose expectation value is known to be
zero for any N-Representable state. Generators are used for efficiency.
Args | |
|---|---|
n_orbitals
|
int
number of spin-orbitals on which operators act. |
n_fermions
|
int
number of fermions in the system. |
Yields | |
|---|---|
| Constraint is a FermionOperator with zero expectation value. |