> ## Documentation Index
> Fetch the complete documentation index at: https://prod-mint.classiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# 0.84.0

Released on 2025-06-25.

## Upgrade Instructions

* [Python SDK](/getting-started/registration_installations#platform-version-updates)
* The IDE upgrades automatically.

## Enhancements

* Added new [chemistry functions](/sdk-reference/applications/chemistry) 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`](http://../sdk-reference/qmod/functions/core_library/exponentiation/#classiq.qmod.builtins.functions.exponentiation.multi_suzuki_trotter),
  that applies the Suzuki-Trotter decomposition jointly to a sum of Hamiltonians.

* Added a new syntax for specifying sparse Hamiltonians ([`SparsePauliOp`](http://../sdk-reference/qmod/classical-types/#classiq.qmod.builtins.structs.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](http:///qmod-reference/language-reference/classical-types/#hamiltonians)
  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`](/sdk-reference/execution#classiq.execution.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

<Card title="__PROTECTED_0__ class attribute" href="http:///qmod-reference/language-reference/quantum-types/#attributes_2" />

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`](http://../sdk-reference/qmod/classical-types/#classiq.qmod.builtins.structs.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`](http:///sdk-reference/execution/#classiq.execution.ExecutionSession)'s
  `estimate` methods now accept a sparse Hamiltonian ([`SparsePauliOp`](http://../sdk-reference/qmod/classical-types/#classiq.qmod.builtins.structs.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.