Aleph - 0.41.0

✨ New Features

• Added New classes PauliTerm and PauliSum to speed up operations involving pauli strings.
  • PauliTerm represents a Pauli string $P = c \prod_n O_n , \quad O_n \in \{ I, X, Y, Z \}$. They can be scaled, multiplied in and out of place with eachother, and can check if they commute.
  • PauliSum represents a sum of PauliTerms. The sum can be truncated by the weight of the strings or by the norm of their coefficient. Explicit commutators between a single Pauli string or a sum of them as a PauliSum can be computed. The sums can also be conjugated by Pauli rotations $U^{\dag} S U$ where $U = \exp(i \theta Q)$ and Q is a Pauli string.
  • Conversions between this numerically efficient type and the Operator framework can be done via the convert_to_paulisum and convert_to_operatorsum functions.

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