Aleph - 0.42.0

✨ New Features

• Quality of life improvements for numerical Pauli strings:
  • Added * overloads for PauliTerm and PauliSum.
  • Can now compute the expectation value $\\langle S \\rangle$ of a PauliSum with a Qbit.
  • The Pauli string of a PauliTerm or PauliSum can now be printed in a more readable format using display.
  • Added a transform_coefficients method for PauliSum that applies a function to each element of the sum.
  • Added adjoint and adjointed methods, which perform the Hermitian conjugate in-place and out-of-place on a PauliSum, respectively.
• Aleph fermionic operators are now unified under a shared FermionOperator type. Factory functions such as Create, Destroy, Number, TransferSum, PairingSum, QuadraticSum, and the tensor-based fermion operator factories now all return FermionOperator values.
• Fermionic operators in Aleph now support consistent introspection through name(), sites(), and parameters():
  • name() returns the operator kind as a string.
  • sites() returns the operator sites in definition order.
  • parameters() returns the operator payload when present, such as a parameter list, a rank-4 tensor, or a quadratic sparse matrix.

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🛠 Improvements

• Quadratic fermion helper methods such as get_bdg_matrix() and get_bdg_shift() now work through the shared FermionOperator binding surface.

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🐛 Fixes

• Fixed MPO generation from lattice models and operators in more than one dimension.

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⚠️ Breaking Changes

• Aleph fermionic operator values now report the unified FermionOperator type instead of older binding-specific concrete type names.

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🧪 Migration Notes

• If your code compared fermionic operator type_name() results against older binding-specific names, update those checks to use FermionOperator.
• If you were inspecting fermionic operators through binding-specific type distinctions, switch to the shared name(), sites(), and parameters() accessors.