qml.estimator.compact_hamiltonian.CDFHamiltonian

class CDFHamiltonian(num_orbitals, num_fragments, one_norm=None)

Bases: object

For a compressed double-factorized (CDF) Hamiltonian, stores the minimum necessary information pertaining to resource estimation.

The form of this Hamiltonian is described in arXiv:2506.15784.

Parameters:

• num_orbitals (int) – number of spatial orbitals

• num_fragments (int) – number of fragments in the compressed double-factorized (CDF) representation

• one_norm (float | None) – the one-norm of the Hamiltonian

Raises:

• TypeError – if num_orbitals, or num_fragments is not a positive integer

• TypeError – if one_norm is provided but is not a non-negative float or integer

See also

TrotterCDF

Attributes

one_norm

one_norm = None

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