QuAIRKit 0.3.0 Release Note

Feature Rollout

• Probabilistic computation: internally supported parallel (pure & mixed state) computations for probabilistic outcomes generated by measurements or quasi-sampling:
  • Circuit.collapse: renamed as Circuit.measure. When desired_result is None, calling this attribute would store all mid-circuit measurement outcomes and the corresponding probability distribution.
  • Measure: same as above.
  • Circuit.locc: add one-way LOCC (unitary) protocol to the circuit. Detailed tutorials will be released in the next version.
  • State.index_select: replaced by State.prob_select, which can be called to select the particular outcome.
• Controlled operation: QuAIRKit now support multi-control unitaries:
  • Circuit.control_oracle: can inputs multi-control indices and customized projections.
    For example, cir.control_oracle(u, [[0, 1], 2], P) is equivalent to inserting the unitary

$$(I - P) \otimes I + P \otimes U$$

• Quantum information functions: Advanced the quairkit.qinfo module with the following changes:
  • mutual_information: compute the mutual information of a bipartite state
  • general_state_fidelity: compute the fidelity of two subnormalized states.
  • Nkron: now supports trivial inputs, and has an alias name nkron

Stability Update

• All matrix and channel representation functions are compatible with NumPy inputs and outputs.
• Add code examples in docstrings of functions in database.
• Improve the efficiency and interfaces of PQCombNet, which is now imported by quairkit.application.
• Add bug fixes.

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End of Release Notes