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Released on 2025-06-25.

Upgrade Instructions

Enhancements

  • Added new chemistry functions to the Python SDK for using Hartree-Fock and UCC ansatz in Qmod. In order to use them, it is required to install the Python SDK with the extra chemistry dependency.
  • Qmod functions are represented with a single symbolic definition throughout the compilation process when their use of classical parameters allows it. This improves compilation time and output QASM code size in many cases.
  • Added a new function, multi_suzuki_trotter, that applies the Suzuki-Trotter decomposition jointly to a sum of Hamiltonians.
  • Added a new syntax for specifying sparse Hamiltonians (SparsePauliOp) in Qmod's Python embedding. For example: 0.5 * Pauli.Z(0) * Pauli.Y(1) * Pauli.X(2) + 0.8 * Pauli.X(1). Check out the documentation for more details.

  • Added a dataframe property to ExecutionDetails object. Example usage:

    with ExecutionSession(qprog) as es:
    result = es.sample()

df = result.dataframe

  • Added a new execution primitive ExecutionSession.minimize that encapsulates classical optimization of ansatz parameters. The cost function to minimize is specified either as a quantum observable (Hamiltonian) or an arithmetic expression. This offers a significant performance advantage compared to executing the same logic on the client side, as it eliminates communication overhead. Note that it utilizes a fixed generic minimization scheme (scipy-COBYLA). In non-trivial cases, you may still need to implement your own optimization logic.

  • The total size of quantum structs can be retrieved using the new num_qubits class attribute of QStruct.

Interface Changes

  • Function sparse_suzuki_trotter will no longer be supported starting on 21/7/25 at the earliest. Instead, use suzuki_trotter.
  • Function parametric_suzuki_trotter will no longer be supported starting on 21/7/25 at the earliest. Instead, use multi_suzuki_trotter.
  • Function suzuki_trotter now receives a sparse Hamiltonian (SparsePauliOp) instead of a list of non-sparse Pauli terms (CArray[PauliTerm]). Non-sparse pauli terms in suzuki_trotter are deprecated, use SparsePauliOp instead.
  • ExecutionSession's estimate methods now accept a sparse Hamiltonian (SparsePauliOp) instead of a list of non-sparse Pauli terms (CArray[PauliTerm]). Non-sparse pauli terms in ExecutionSession will no longer be supported starting on 21/7/25 at the earliest. Use SparsePauliOp instead.