ffsim.ProductStateSum¶

class ffsim.ProductStateSum(coeffs: np.ndarray, states: list[tuple[np.ndarray, np.ndarray]])[source]¶

A linear combination of product states.

Given a ProductStateSum prod_state_sum, the full state vector can be reconstructed as

sum(
    coeff * np.kron(vec_a, vec_b)
    for coeff, (vec_a, vec_b) in zip(
        prod_state_sum.coeffs, prod_state_sum.states
    )
)

Methods

Attributes

`coeffs`	Alias for field number 0
`states`	Alias for field number 1