QuAIRKit 0.2.0 Release Note

Feature Rollout

• Qudit computation: QuAIRKit now support qudit systems in state evolution, circuit measurement, database generation and training. These covered functionals accept num_systems and system_dim as inputs.
  • argument num_systems is aliased with num_qubits
  • argument system_dim accepts both interger or a list of integers, representing the dimensions of all systems. Defaults to 2, i.e., all systems are qubits.
• Quantum information functions: Advanced the quairkit.qinfo module with the following changes:
  • partial_trace & partial_transpose: The interfaces of these two functions are aligned with PartialTrace and PartialTranspose in QETLAB. Moreover, these functions support qudit computations.
    • transpose_2 is now removed from quairkit.
    • partial_trace_discontiguous remains unchanged, but only supports qubit systems.
  • is_povm & is_pvm: Check whether the input set of matrices form a POVM or PVM.
  • mana_state & mana_channel: Compute the mana of input state/channel.
  • stab_nullity & stab_renyi: Compute the stabilizer nullity/Renyi entropy of input state
  • Almost all functions in quairkit.qinfo support batched array inputs.
• Training: Add training net PQCombNet for quantum circuit architectural search, can be imported by quairkit.ansatz.comb.
• State features: Add the following properties & methods for flexible usage
  • system_dim: User now can change the system dimensions of a State instance.
  • trace, transpose & permute: same as partial_trace, transpose & permute_systems, except there is no need to input data or specify system dimensions.
  • sqrt & log: same as sqrtm & logm

Stability Update

• Import regulation: Add __init__ to all top-level modules, so that the following commands

from quairkit.database import *
from quairkit.loss import *
from quairkit.qinfo import *

would not import some unexpected variables.

• GPU speedup: Significantly improve GPU performances on batch computations.
• Add quairkit.print_info function that can print all packages and hardware information for sanity check.
• Add bug fixes and API improvements.

Tutorials

• Rewrite 4 old tutorials to improve readability.
• Add 4 new introduction tutorials, including:
  • Hamiltonian in QuAIRKit
  • Quantum gates and quantum channels
  • Quantum information tools
  • Training parameterized quantum circuits
• Add 2 new feature tutorials, including:
  • Neural network setup customization
  • Introduction to qudit quantum computing

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End of Release Notes