Qiskit Aer 0.4.2

Changelog

Fixed

• Fixes for terra 0.13 release (#676)
• Add support for terra diagonal gate (#683)
• Add support for parameterized qobj (#485)
• Added postfix for linux on Raspberry Pi (#651)
• Handle numpy array inputs from qobj (#656)

Qiskit Aer 0.4.1

Changelog

Added

• Add terra to the Aer requirements list (#593)
• Find muparserx system library before using distributed one (#621)
• MPS: Support multi-qubit apply matrix (#634)
• MPS: Added thresholds to loops that use parallelization (#638)
• MPS: Improvements to apply_matrix (#641)

Changed

• Bump minimum required version of numpy (#594)
• Replace PyDataMem_NEW_ZEROED to PyDataMem_NEW (#578)

Fixed

• Fixed bug in QuantumError compose method when composing Kraus with non-Kraus
  errors (#605).
• Fix TBB compilation (#598)
• Fixed MPS expectation value when qubits are not given in ascending order (#603)
• Fix bug in QuantumError compose method (#605)
• Fix gate fusion (#606)
• Removes static numpy initialization strategy for the Pulse simulator (#609)
• Fix QuantumError sometimes casting probabilities to complex (#640)

Qiskit Aer 0.4.0

CHANGELOG

Added

• Added NoiseModel.from_backend for building a basic device noise model for an IBMQ
  backend (#569)
• Added multi-GPU enabled simulation methods to the QasmSimulator, StatevectorSimulator,
  and UnitarySimulator. The qasm simulator has gpu version of the density matrix and
  statevector methods and can be accessed using "method": "density_matrix_gpu" or
  "method": "statevector_gpu" in backend_options. The statevector simulator gpu method
  can be accessed using "method": "statevector_gpu". The unitary simulator GPU method can
  be accessed using "method": "unitary_gpu". These backends use CUDA and require an NVidia
  GPU.(#544)
• Added PulseSimulator backend (#542)
• Added PulseSystemModel and HamiltonianModel classes to represent models to be used in PulseSimulator (#496, #493)
• Added duffing_model_generators to generate PulseSystemModel objects from a list of parameters (#516)
• Migrated ODE function solver to C++ (#442, #350)
• Added high level pulse simulator tests (#379)
• CMake BLAS_LIB_PATH flag to set path to look for BLAS lib (#543)

Changed

• Changed the structure of the src directory to organise simulator source code.
  Simulator controller headers were moved to src/controllers and simulator method State
  headers are in src/simulators (#544)
• Moved the location of several functions (#568):
  • Moved contents of qiskit.provider.aer.noise.errors into the qiskit.providers.noise module
  • Moved contents of qiskit.provider.aer.noise.utils into the qiskit.provider.aer.utils module.
• Enabled optimization to aggregate consecutive gates in a circuit (fusion) by default (#579).

Deprecated

• Deprecated utils.qobj_utils functions (#568)
• Deprecated qiskit.providers.aer.noise.device.basic_device_noise_model. It is superseded by the
  NoiseModel.from_backend method (#569)

Removed

• Removed NoiseModel.as_dict, QuantumError.as_dict, ReadoutError.as_dict, and
  QuantumError.kron methods that were deprecated in 0.3 (#568).

Qiskit Aer 0.3.4

Changelog

Added

• Added support for probabilities snapshot and Pauli expectation value snapshot in the stabilizer simulator (#423)

Fixed

• MPS simulation method: fixed computation of snapshot_probabilities
  on subsets of the qubits, in any ordering (#424)
• Fixes bug where cu3 was being applied as cu1 for unitary_simulator (#483)

Qiskit Aer 0.3.3

Changelog

Added

• Added controlled gates (cu1, cu2, cu3) to simulator basis_gates (#417)
• Added multi-controlled gates (mcx, mcy, mcz, mcu1, mcu2, mcu3)
  to simulator basis gates (#417)
• Added gate definitions to simulator backend configurations (#417)

Changed

• Improved pershot snapshot data container performance (#405)
• Add basic linear algebra functions for numeric STL classes (#406)
• Improved average snapshot data container performance (#407)

Qiskit Aer 0.3.2

CHANGELOG

Fixed

• Fix sdist to always attempt to build (#401)

Qiskit Aer 0.3.1

Changelog

Added

• Added tests for the Fredkin gate (#357)
• Added tests for the cu1 gate (#360)
• Added tests for statevector and stabilizer snapshots (#355)
• Added tests for density matrix snapshot (#374)
• Added tests for probabilities snapshot (#380)
• Added support for reset() in MPS simulation method (#393)
• Added tests for matrix and Pauli expectation value snapshot (#386)

Changed

• Changes signature of SnapshotExpectationValue extension and the way qubit position parameters are parsed in expectation_value_matrix qobj instructions (#386)
• Change signature of SnapshotProbabilities extension (#380)
• Change signature of SnapshotDensityMatrix extension (#374)
• Stabilizer snapshot returns stabilizer instead of full Clifford table (#355)
• Signature of SnapshotStatevector and SnapshotStabilizer (#355)
• Changed all names from tensor_network_state to matrix_product_state (#356)
• Update device noise model to consume asymmetric readout errors from backends (#354)
• Update device noise model to use gate_length (#352)
• Refactoring code and introducing floating point comparison func (#338)

Qiskit Aer 0.3.0

Changelog

Added

• New simulation method for qasm simulator: tensor_network (#56)
• Added superop qobj instruction and superoperator matrix utils (#289)
• Added support for conditional unitary, kraus, superop qobj instructions (#291)
• Add "validation_threshold" config parameter to Aer backends (#290)
• Added support for apply_measure in tensor_network_state. Also changed
  sample_measure to use apply_measure (#299)
• Added density matrix simulation method to QasmSimulator (#295, #253)
• Adds delay measure circuit optimization (#317)
• Added sampling for sampling with readout-errors (#222)
• Added support of single precision for statevector and density matrix simulation (#286, #315)
• Noise model inserter module (#239)

Changed

• Added density matrix method to automatic QasmSimulator methods (#316)

Fixed

• Bug in handling parallelization in matrix_product_state.cpp (PR #292)
• Added support for multiplication by coeff in tensor_network_state expectation value snapshots (PR #294)
• Change name of qasm simulation method from tensor_network to matrix_product_state (#320)

Qiskit Aer 0.2.3

Changelog

Fixed

• Bug in measure sampling conditional checking with conditional instructions (#280)

Qiskit Aer 0.2.2

Changelog

Added

• Added multi-controlled phase gate to QubitVector and changed
  multi-controlled Z and multi-controlled u1 gates to use this method (# 258)
• Added optimized anti-diagonal single-qubit gates to QubitVector (# 258)

Changed

• Improve performance of matrix fusion circuit optimization and move fusion
  code out of QubitVector class and into Fusion optimization class (#255)

Removed

• Remove matrix_sequence Op type from Op class (#255)

Fixed

• Change maximum parameter for depolarizing_error to allow for error channel
  with no identity component. (#243)
• Fixed 2-qubit depolarizing-only error parameter calculation in
  basic_device_noise_model (#243)
• Set maximum workers to ThreadPoolExecutor in AerJob to limit thread creation (#259)