Qiskit Aer 0.7.1

Changelog

Fixed

• Corrected qubits ordering in MPS::sample_measure_using_probabilities. (#1011)
• Fixed bug in MPS::apply_kraus (#1003)
• Fix Aer provider to return new backend instances with backends/get_backend. (#1006)
• Fix bug in unsupported instructions error message (#1005)

Qiskit Aer 0.7.0

Changelog

Deprecated

• Add support for phase, sqrt(X), and delay gates to simulators (#951)

Added

• Fix fusion thresholds and defaults (#990)
• Add missing standard gate basis gates (#989)
• Move AVX2 logic into Transformer class and enable SIMD on Unitary, DensityMatrix, SuperOp (#961)
• MPS: Apply kraus (#915)
• Add support for phase, sqrt(X), and delay gates to simulators (#951)
• MPS: Support snapshot_density_matrix (#948)
• Add support for rotation gates to noise model and simulators (#914)
• Add custom Vector class (#932)
• Add qobj header global phase support (#931)
• Kraus noise gate fusion method (#927)

Removed

• Drop support for Python 3.5 (#917)

Fixed

• Fix snapshots being copied rather than moved (#971)
• Add available memory checks for Statevector and Unitary simulators (#969)
• Make controller_wrapper functions functors (#945)
• fix a bug in thread management tests (#918)
• Fix evaluation y expectation (#898)
• Fix bug in StatevectorSimulator preventing AVX2, GPU, and single-precision simulations (#872)

Qiskit Aer 0.6.1

Changelog

Fixed

• [Stable] Fix bug in StatevectorSimulator preventing AVX2, GPU, and single-precision simulations (#872) (#873)

Qiskit Aer 0.6.0

Changelog

Added

• Add gate fusion to StatevectorSimulator and UnitarySimulator (#861)
• MPS: Improve performance of sample_measure (#808)
• Add BLAS_LIB_PATH as ENV var (#822)
• Add SIMD (AVX) extension for QubitVector (#684)
• Adding Delay, ShiftPhase, and SetPhase instruction handling to pulse simulator (#813)
• Cache ODE RHS params (#814)
• Improve integration and performance of matrix class and matrix based simulators (#801)
• MPS: Improve performance of Pauli expectation value (#812)
• optimize expectation value by considering pairwise operations (#806)
• Introduce abstraction of DE methods (#784)
• Improve performance of average snapshots (#807)
• Remove unnecessary copy of ExperimentResult objects (#796)
• Improve performance of pybind11 result conversion (#799)
• Introducing approximation into the MPS simulation method (#475)
• Add move semantics to matrix class (#794)
• Allow for suppressing warnings in NoiseModel.from_backend() (#792)
• Add subsystem density matrix snapshots to qasm simulator (#718)
• Select CUDA architecture(s) through Cmake option (#783)
• Add Conan package manager to the buildsystem (#648)
• MPS: Optimize swaps (#665)
• Optimize Pauli expectation value performance (#737)
• Improve efficiency of checking measurement sampling conditions (#730)
• Improve gate fusion (#667)

Changed

• Remove "extended_stabilizer" from automatic simulation methods. (#699)
• Disable jsonschema validation by default (#688)

Fixed

• Fix error when passed an expval snapshot with zero coefficient (#826)
• Fix channel value bug and revamp pulse sim testing (#811)
• MPS: Fixed bug related to floating-point precision on Windows (#809)
• Fix bug in DensityMatrixThrust apply_y (#771)
• Fix required memory checks for QasmSimulator with custom method (#763)
• Fixed cz gate of DensityMatrixThrust #754 (#760)
• Fix bugs in density matrix simulation method for diagonal gates and conditionals (#767)
• Density matrix snapshot not returned as Numpy array (#712)
• Fix Hamiltonian parsing edge cases in pulse simulator (#752)
• Fix stall of pulse simulator execution as described in issue #726 (#734)
• Fixing subsystem_list handling in pulse simulator (#722)
• Fix number of parallel shots for statevector and unitary sims (#725)
• Fix memory leak in gpu simulator (#717)
• Fix tolerance when checking if diagonal is unitary (#707)
• Fix depol error param for device noise model with depol + relaxation error (#704)
• adding cy to stabilizer (#701)
• Fix ReduceBarriers to be applied before truncation (#693)

Qiskit Aer 0.5.2

Changelog

Fixed

• Fix required memory checks for QasmSimulator with custom method (#763)
• Fixed cz gate of DensityMatrixThrust #754 (#760)
• Fix bugs in density matrix simulation method for diagonal gates and conditionals (#767)
• Fix number of parallel shots for statevector and unitary sims (#725)
• Fix memory leak in gpu simulator (#717)

Qiskit Aer 0.5.1

Changelog

Changed

• Remove "extended_stabilizer" from automatic simulation methods. (#699)
• Disable jsonschema validation by default (#688)

Fixed

• adding cy to stabilizer (#701)
• Fix ReduceBarriers to be applied before truncation (#693)

Qiskit Aer 0.5.0

Changelog

Fixed

• 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 0.4.2

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).