Truncation#

class cuquantum.pauliprop.experimental.Truncation(
pauli_weight_cutoff: int | None = None,
pauli_coeff_cutoff: float | None = None,
)[source]#

Truncation strategy for Pauli expansion operations.

Truncation can be applied during gate application or as a standalone operation to reduce the number of terms in a Pauli expansion. Multiple truncation criteria can be specified together; terms are removed if they fail any criterion.

Parameters:

  • pauli_weight_cutoff – Maximum Pauli weight (number of non-identity Paulis) to keep. Terms with Pauli weight (non-identity Pauli operators) greater than this value are removed. If None, no weight-based truncation is applied.

  • pauli_coeff_cutoff – Minimum absolute coefficient value to keep. Terms with |coefficient| < pauli_coeff_cutoff are removed. If None, no coefficient-based truncation is applied.

Example

>>> # Keep only terms with weight <= 3 and |coef| >= 1e-10
>>> truncation = Truncation(pauli_weight_cutoff=3, pauli_coeff_cutoff=1e-10)
>>> result = expansion.apply_gate(gate, truncation=truncation)

>>> # Only weight-based truncation
>>> truncation = Truncation(pauli_weight_cutoff=5)

>>> # Only coefficient-based truncation
>>> truncation = Truncation(pauli_coeff_cutoff=1e-8)
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