Qiskit Aqua 0.6.1

Changelog

Changed

• Remove terra cap from stable branch.

Qiskit Aqua 0.6.0

Changelog

Added

• Relative-Phase Toffoli gates rccx (with 2 controls) and rcccx
  (with 3 controls).
• Variational form RYCRX
• A new 'basic-no-ancilla' mode to mct.
• Multi-controlled rotation gates mcrx, mcry, and mcrz as a general
  u3 gate is not supported by graycode implementation
• Chemistry: ROHF open-shell support
  • Supported for all drivers: Gaussian16, PyQuante, PySCF and PSI4
  • HartreeFock initial state, UCCSD variational form and two qubit reduction for
    parity mapping now support different alpha and beta particle numbers for open
    shell support
• Chemistry: UHF open-shell support
  • Supported for all drivers: Gaussian16, PyQuante, PySCF and PSI4
  • QMolecule extended to include integrals, coeffiecients etc for separate beta
• Chemistry: QMolecule extended with integrals in atomic orbital basis to facilitate common access
  to these for experimentation
  • Supported for all drivers: Gaussian16, PyQuante, PySCF and PSI4
• Chemistry: Additional PyQuante and PySCF driver configuration
  • Convergence tolerance and max convergence iteration controls.
  • For PySCF initial guess choice
• Chemistry: Processing output added to debug log from PyQuante and PySCF computations (Gaussian16
  and PSI4 outputs were already added to debug log)
• Chemistry: Merged qiskit-chemistry to this repo. The old chemistry changelog is at
  OLD_CHEMISTRY_CHANGELOG.md
• Add MatrixOperator, WeightedPauliOperator and TPBGroupedPauliOperator class. (#593)
• Add evolution_instruction function to get registerless instruction of time evolution. (#593)
• Add op_converter module to unified the place in charge of converting different types of operators. (#593)
• Add Z2Symmetries class to encapsulate the Z2 symmetries info and has helper methods for tapering an
  Operator. (#593).
• Amplitude Estimation: added maximum likelihood postprocessing and confidence interval computation.
• Maximum Likelihood Amplitude Estimation (MLAE): Implemented new algorithm for amplitude estimation based on
  maximum likelihood estimation, which reduces number of required qubits and circuit depth.
• Added (piecewise) linearly and polynomially controlled Pauli-rotation circuits.
• Add q_equation_of_motion to study excited state of a molecule, and add two algorithms to prepare the reference
  state. (#655)

Changed

• Improve mct's 'basic' mode by using relative-phase Toffoli gates to build intermediate results.
• Adapt to Qiskit Terra's newly introduced Qubit class.
• Prevent QPE/IQPE from modifying input Operators.
• The PyEDA dependency was removed;
  corresponding oracles' underlying logic operations are now handled by SymPy.
• Refactor the Operator class, each representation has its own class MatrixOperator,
  WeightedPauliOperator and TPBGroupedPauliOperator. (#593)
• The power in evolution_instruction was applied on the theta on the CRZ gate directly,
  the new version repeats the circuits to implement power. (#593)
• CircuitCache is OFF by default, and it can be set via environment variable now
  QISKIT_AQUA_CIRCUIT_CACHE. (#630)

Fixed

• A bug where TruthTableOracle would build incorrect circuits for truth tables with only a single 1 value.
• A bug caused by PyEDA's indeterminism.
• A bug with QPE/IQPE's translation and stretch computation.
• Chemistry: Bravyi-Kitaev mapping fixed when num qubits was not a power of 2
• Setup initial_layout in QuantumInstance via a list. (#630)

Removed

• General multi-controlled rotation gate mcu3 is removed and replaced by
  multi-controlled rotation gates mcrx, mcry, and mcrz

Deprecated

• The Operator class is deprecated, in favor of using MatrixOperator,
  WeightedPauliOperator and TPBGroupedPauliOperator. (#593)

Qiskit Aqua 0.5.5

Changelog

Fixed

• A bug with docplex.get_qubitops's incorrect translation

Qiskit Aqua 0.5.4

Changelog

Fixed

• Fix the bug about manipulating the right operand and rebuild diagonal matrix every time. (#622)

Qiskit Aqua 0.5.3

Changelog

Fixed

• Since the syntax inverse() on a gate does not invert a gate now, the bug introduced wrong post rotation for Pauli Y.

Qiskit Aqua 0.5.2

Changelog

Changed

• The pyeda requirement was made optional instead of an install requirement

Qiskit Aqua 0.5.1

Changelog

Changed

• Make torch optional install

Qiskit Aqua 0.5.0

Changelog

Added

• Implementation of the HHL algorithm supporting LinearSystemInput.
• Pluggable component Eigenvalues with variant EigQPE.
• Pluggable component Reciprocal with variants LookupRotation and LongDivision.
• Multiple-Controlled U1 and U3 operations mcu1 and mcu3.
• Pluggable component QFT derived from component IQFT.
• Summarize the transpiled circuits at the DEBUG logging level.
• QuantumInstance accepts basis_gates and coupling_map again.
• Support to use cx gate for the entangement in RY and RYRZ variational form. (cz is the default choice.)
• Support to use arbitrary mixer Hamiltonian in QAOA. This allows to use QAOA in constrained optimization problems [arXiv:1709.03489].
• Added variational algorithm base class VQAlgorithm, implemented by VQE and VQC.
• Added ising/docplex.py for automatically generating Ising Hamiltonian from optimization models of DOcplex.
• Added 'basic-dirty-ancilla' mode for mct.
• Added mcmt for Multi-Controlled, Multi-Target gate.
• Exposed capabilities to generate circuits from logical AND, OR, DNF (disjunctive normal forms), and CNF (conjunctive normal forms) formulae.
• Added the capability to generate circuits from ESOP (exclusive sum of products) formulae with optional optimization based on Quine-McCluskey and ExactCover.
• Added LogicalExpressionOracle for generating oracle circuits from arbitrary boolean logic expressions (including DIMACS support) with optional optimization capability.
• Added TruthTableOracle for generating oracle circuits from truth-tables with optional optimization capability.
• Added CustomCircuitOracle for generating oracle from user specified circuits.
• Added implementation of the Deutsch-Jozsa algorithm.
• Added implementation of the Bernstein-Vazirani algorithm.
• Added implementation of the Simon's algorithm.
• Added implementation of the Shor's algorithm.
• Added optional capability for Grover's algorithm to take a custom initial state (as opposed to the default uniform superposition)
• Added capability to create a Custom initial state using existing circuit.
• Added the ADAM (and AMSGRAD) optimization algorithm
• Multivariate distributions added, so uncertainty models now have univariate and multivariate distribution components.
• Added option to include or skip the swaps operations for qft and iqft circuit constructions.
• Added classical linear system solver ExactLSsolver.
• Added parameters auto_hermitian and auto_resize to HHL algorithm to support non-hermititan and non 2**n sized matrices by default.
• Added another feature map, RawFeatureVector, that directly maps feature vectors to qubits' states for classification.
• SVM_Classical can now load models trained by QSVM.
• Added CompleteMeasFitter for mitigating measurement error when jobs are run on a real device or noise simulation.

Removed

• QuantumInstance does not take memory anymore.
• Moved Command line and GUI interfaces to separate repo (qiskit_aqua_uis).
• Removed the SAT-specific oracle (now supported by LogicalExpressionOracle).

Changed

• Changed the type of entanger_map used in FeatureMap and VariationalForm to list of list.
• Fixed package setup to correctly identify namespace packages using setuptools.find_namespace_packages.
• Changed advanced mode implementation of mct: using simple h gates instead of ch, and fixing the old recursion step in _multicx.
• Components random_distributions renamed to uncertainty_models.
• Reorganized the constructions of various common gates (ch, cry, mcry, mct, mcu1, mcu3, mcmt, logic_and, and logic_or) and circuits (PhaseEstimationCircuit, BooleanLogicCircuits, FourierTransformCircuits, and StateVectorCircuits) under the circuits directory.
• Renamed the algorithm QSVMVariational to VQC, which stands for Variational Quantum Classifier.
• Renamed the algorithm QSVMKernel to QSVM.
• Renamed the class SVMInput to ClassificationInput.
• Renamed problem type 'svm_classification' to 'classification'

Fixed

• Fixed ising/docplex.py to correctly multiply constant values in constraints

Qiskit Aqua 0.4.1

Changelog

Added

• Optimizers now have most relevant options on constructor for ease of programming. Options may still be set via set_options.
• Provider is now explicilty named and the named backend is created from that named provider. Backend being selected from the first of the internally known set of providers is deprecated.
• Improve operation with Aer provider/backends.
• Registration to Aqua of externally provided pluggable algorithms and components altered to setuptools entry point support for plugins. The prior registration mechanism has been removed.
• A flag before_04 in the load_from_dict(file) method is added to support to load operator in the old format. We encourage to save the operator in the new format from now on.

Qiskit Aqua 0.4.0

Changelog

Added

• Compatibility with Terra 0.7
• Compatibility with Aer 0.1
• Programmatic APIs for algorithms and components -- each component can now be instantiated and initialized via a single (non-emptY) constructot call
• QuantumInstance API for algorithm/backend decoupling -- QuantumInstance encapsulates a backend and its settings
• Updated documentation and Jupyter Notebooks illustrating the new programmatic APIs
• Transparent parallelization for gradient-based optimizers
• Multiple-Controlled-NOT (cnx) operation
• Pluggable algorithmic component RandomDistribution
• Concrete implementations of RandomDistribution: BernoulliDistribution, LogNormalDistribution,
  MultivariateDistribution, MultivariateNormalDistribution, MultivariateUniformDistribution, NormalDistribution,
  UniformDistribution, and UnivariateDistribution
• Pluggable algorithmic component:
• Concrete implementations of UncertaintyProblem: FixedIncomeExpectedValue, EuropeanCallExpectedValue, and
  EuropeanCallDelta
• Amplitude Estimation algorithm
• Qiskit Optimization: New Ising models for optimization problems exact cover, set packing, vertex cover, clique, and graph partition
• Qiskit AI:
  • New feature maps extending the FeatureMap pluggable interface: PauliExpansion and PauliZExpansion
  • Training model serialization/deserialization mechanism
• Qiskit Finance:
  • Amplitude estimation for Bernoulli random variable: illustration of amplitude estimation on a single qubit problem
  • Loading of multiple univariate and multivariate random distributions
  • European call option: expected value and delta (using univariate distributions)
  • Fixed income asset pricing: expected value (using multivariate distributions)

Removed

• HartreeFock component of pluggable type ``InitialState` moved to Qiskit Chemistry
• UCCSD component of pluggable type VariationalForm moved to Qiskit Chemistry