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)

Qiskit Aer 0.2.1

Changelog

Added

• Use seed_simulator from qobj (#210)

Fixed

• Fix memory error handling for huge circuits (#216)
• Fix equality expressions in Python code (#208)

Qiskit Aer 0.2.0

Changelog

Added

• Add multiplexer gate (#192)
• Add remap_noise_model function to noise.utils (#181)
• Add __eq__ method to NoiseModel, QuantumError, ReadoutError (#181)
• Add support for labelled gates in noise models (#175).
• Add optimized mcx, mcy, mcz, mcu1, mcu2, mcu3, gates to QubitVector (#124)
• Add optimized controlled-swap gate to QubitVector (#142)
• Add gate-fusion optimization for QasmContoroller, which is enabled by setting fusion_enable=true (#136)
• Add better management of failed simulations (#167)
• Add qubits truncate optimization for unused qubits (#164)
• Add ability to disable depolarizing error on device noise model (#131)
• Add initialise simulator instruction to statevector_state (#117, #137)
• Add coupling maps to simulators (#93)
• Add circuit optimization framework (#83)
• Add benchmarking (#71, #177)
• Add wheels support for Debian-like distributions (#69)
• Add autoconfiguration of threads for qasm simulator (#61)
• Add Simulation method based on Stabilizer Rank Decompositions (#51)

Changed

• Add basis_gates kwarg to NoiseModel init (#175).
• Depreciated "initial_statevector" backend option for QasmSimulator and StatevectorSimulator (#185)
• Rename "chop_threshold" backend option to "zero_threshold" and change default value to 1e-10 (#185).
• Add an optional parameter to NoiseModel.as_dict() for returning dictionaries that can be
  serialized using the standard json library directly. (#165)
• Refactor thread management (#50)

Removed

Fixed

• Improve noise transformations (#162)
• Improve error reporting (#160)
• Improve efficiency of parallelization with max_memory_mb a new parameter of backend_opts (#61)
• Improve u1 performance in statevector (#123)
• Fix OpenMP clashing problems on MacOS for the Terra Addon (#46)

Qiskit Aer 0.1.1

Changelog

Added

• Adds version information when using the standalone simulator (#36)
• Adds a Clifford stabilizer simulation method to the QasmSimulator (#13)
• Improve Circuit and NoiseModel instructions checking (#31)
• Add reset_error function to Noise models (#34)
• Improve error reporting at installation time (#29)
• Validate n_qubits before execution (#24)
• Add qobj method to AerJob (#19)

Removed

• Reference model tests removed from the codebase (#27)

Fixed

• Fix Contributing guide (#33)
• Fix an import in Terra integration tests (#33)
• Fix non-OpenMP builds (#19)
• Fix Windows packaging to include openblas.dll