> ## 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.

# 0.83.0

Released on 2025-06-09.

## Upgrade Instructions

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

## Enhancements

* Added the concatenation operator to Qmod. This operator packs a sequence of
  quantum variables (or their parts) into a qubit array. For example,
  `hadamard_transform([my_qnum, my_qarray[1:3]])` passes an array of the
  respective qubits to the function. See more under
  [concatenation operator](https:///qmod-reference/language-reference/quantum-variables/#concatenation-operator).

* Width constraints are now treated more systematically for optimization
  levels 0-2 (partitioning the model into separate synthesis steps), yielding
  solutions in cases where previously no solution was found. See more under
  [Optimization Level](/user-guide/synthesis/preferences#optimization-level).

## Interface Changes

* The type `SerailizedQuantumProgram` and method `QuantumProgram.get_qprog` are no longer available.