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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

Types of changes:

  • Added: for new features.
  • Changed: for changes in existing functionality.
  • Deprecated: for soon-to-be removed features.
  • Removed: for now removed features.
  • Fixed: for any bug fixes.
  • Security: in case of vulnerabilities.

UNRELEASED

0.6.0 - 2019-08-22

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)

0.5.5 - 2019-07-26

Fixed

  • A bug with docplex.get_qubitops's incorrect translation

0.5.4 - 2019-07-24

Fixed

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

0.5.3 - 2019-07-16

Fixed

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

0.5.2 - 2019-06-27

Changed

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

0.5.1 - 2019-05-24

Changed

  • Make torch optional install

0.5.0 - 2019-05-02

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 noisy simulator.
  • Added QGAN (Quantum Generative Adversarial Network) algorithm, along with neural network components comprising a quantum generator and classical discriminator.

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

0.4.1 - 2019-01-09

Added

  • Optimizers now have most relevant options on constructor for ease of programming. Options may still be set via set_options.
  • Provider is now explicitly 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.

0.4.0 - 2018-12-19

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)

Changed

  • The pauli string in Operator class is aligned with Terra 0.7. Now the order of a n-qubit pauli string is q_{n-1}...q{0} Thus, the (de)serialier (save_to_dict and load_from_dict) in the Operator class are also changed to adopt the changes of Pauli class.

Removed

  • HartreeFock component of pluggable type [`InitialState]{.title-ref} moved to Qiskit Chemistry
  • UCCSD component of pluggable type VariationalForm moved to Qiskit Chemistry

0.3.1 - 2018-11-29

Changed

  • Different backends might have different signatures for describing the job completion.

0.3.0 - 2018-10-05

Added

  • Updated for 0.6 Terra
  • Enhanced backend settings
Pluggable multiclass classifier extensions

:   -   AllPairs
    -   OneAgainstAll
    -   ErrorCorrectingCode
  • Pluggable Feature Maps for QSVM algos
  • Pluggable Variation Forms for QSVM.Variational
  • SPSA calibration and control variables all configurable
  • Step size configurable for optimizers with numerical approximation of the jacobian
Z2 Symmetry tapering

:   -   Operator
    -   HartreeFock InitialState
    -   UCCSD
  • UCCSD performance improvements
  • Remote device/simulator job auto-recovery
  • Algorithm concatenation: VQE->(I)QPE
Operator improvements

:   -   Subtraction
    -   Negation
    -   Scaling

0.2.0 - 2018-07-27

Added

  • Ising model for TSP.
  • add summarize circuits.
  • Relax max circuits for simulation.
  • Added qubit_tapering method.
  • multiclass svm (one against all).
  • Allow dynamic loading preferences package.module.

Changed

  • Changed name from acqua to aqua.
  • Move QAOA's variational form to under the algorithm implementation directory.
  • Factor out the QAOA variational form.

Fixed

  • Operator will crash if the backend is None.
  • Fix/max num circuits.
  • fix grover for cases that don't need ancillary qubits.
  • Fixed validation error for string of numbers.
  • fix link to ai and opt notebooks.

0.1.2 - 2018-07-12

Added

  • UI Preferences Page including proxies urls, provider, verify.
  • Add help menu with link to documentation.
  • Add num_iterations param to grover.
  • Graph partition ising model added.
  • F2 finite field functions and find_Z2_symmetries function.
  • Added packages preferences array for client custom pluggable packages.

Changed

  • Clean up use_basis_gates options.
  • Change Qiskit registering for Qiskit 0.5.5.

Fixed

  • GUI - Windows: new line appears when text view dismissed.
  • Update test_grover to account for cases where the groundtruth info is missing.
  • Qconfig discovery - Fix permission denied error on list folders.
  • UI Fix Popup cut/copy/paste/select all behavior in mac/windows/linux.
  • Fix typo grouped paulis.
  • Fix numpy argmax usage on potentially complex state vector.
  • Fix/use list for paulis and update helper function of ising model.

0.1.1 - 2018-06-13

Changed

  • Changed short and long descriptions in setup.py.

0.1.0 - 2018-06-13

Changed

  • Changed package name to dashes in setup.py.
  • Updated qiskit minimum version in setup.py.
  • Fixed links in readme.me.