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