Changelog

• Fix installation issue when simulator cannot be built
• Fix bug with auto-generated CNOT coherent error matrix in C++ simulator
• Fix a bug in the async code
• Chinese translation of README
• Changes related with infrastructure (linter, tests, automation) enhancement

• Some minor C++ Simulator bug-fixes
• CMake integration
• QASM improvements
• Mapper optimizer improvements

• Fix parsing U_error matrix in C++ Simulator python helper class
• Fix display of code-blocks on .rst pages

• Fixes several bugs with noise implementations in the simulator.
• Changes some naming conventions for "amp_error" noise parameters to "calibration_error"
• Fixes many spelling mistakes in simulator README.

• We have upgraded some of out external dependencies to:
  • matplotlib >=2.1,<2.2
  • networkx>=1.11,<2.1
  • numpy>=1.13,<1.15
  • ply==3.10
  • scipy>=0.19,<1.1
  • Sphinx>=1.6,<1.7
  • sympy>=1.0

Changelog:

• Fix bug with process tomography reversing qubit preparation order
• Update dependencies to more recent versions

Changelog

• Static compilation has been removed because it seems to be failing while installing Qiskit via pip on Mac.

Changelog

• Minor bug fixing related to pip installation process.

Changelog

• Job handling improvements.
  • Allow asynchronous job submission.
  • New JobProcessor class: utilizes concurrent.futures.
  • New QuantumJob class: job description.
• Modularize circuit "compilation". Takes quantum circuit and information about backend to transform circuit into one which can run on the backend.
• Standardize job description. All backends take QuantumJob objects which wraps qobj program description.
• Simplify addition of backends, where circuits are run/simulated.
  • qiskit.backends package added.
  • Real devices and simulators are considered "backends" which inherent from BaseBackend.
• Reorganize and improve Sphinx documentation.
• Improve unittest framework.
• Add tools for generating random circuits.
• New utilities for fermionic Hamiltonians (qiskit/tools/apps/fermion).
• New utilities for classical optimization and chemistry (qiskit/tools/apps/optimization).
• Randomized benchmarking data handling.
• Quantum tomography (qiskit/tools/qcvv). Added functions for generating, running and fitting process tomography experiments.
• Quantum information functions (qiskit/tools/qi).
  • Partial trace over subsystems of multi-partite vector.
  • Partial trace over subsystems of multi-partite matrix.
  • Flatten an operator to a vector in a specified basis.
  • Generate random unitary matrix.
  • Generate random density matrix.
  • Generate normally distributed complex matrix.
  • Generate random density matrix from Hilbert-Schmidt metric.
  • Generate random density matrix from the Bures metric.
  • Compute Shannon entropy of probability vector.
  • Compute von Neumann entropy of quantum state.
  • Compute mutual information of a bipartite state.
  • Compute the entanglement of formation of quantum state.
• Visualization improvements (qiskit/tools).
  • Wigner function representation.
  • Latex figure of circuit.
• Use python logging facility for info, warnings, etc.
• Auto-deployment of sphinx docs to github pages.
• Check IBMQuantumExperience version at runtime.
• Add QuantumProgram method to reconfigure already generated qobj.
• Add Japanese introductory documentation (doc/ja).
• Add Korean translation of readme (doc/ko).
• Add appveyor for continuous integration on Windows.
• Enable new IBM Q parameters for hub/group/project.
• Add QuantumProgram methods for destroying registers and circuits.
• Use Sympy for evaluating expressions.
• Add support for ibmqx_hpc_qasm_simulator backend.
• Add backend interface to Project Q C++ simulator. Requires installation of Project Q.
• Introduce InitializeGate class. Generates circuit which initializes qubits in arbitrary state.
• Introduce local_qiskit_simulator a C++ simulator with realistic noise. Requires C++ build environment for make-based build. Supported platforms: Linux and Mac.
• Introduce local_clifford_simulator a C++ Clifford simulator. Requires C++ build environment for make-based build. Supported platforms: Linux and Mac.

Bug Fixes

• Fix basis gates (#76).
• Enable QASM parser to work in multiuser environments.
• Correct operator precedence when parsing expressions (#190).
• Fix "math domain error" in mapping (#111, #151).

Backward-incompatible changes

• The standard extension for creating U base gates has been modified to be consistent with the rest of the gate APIs (see #203).
• The silent parameter has been removed from a number of QuantumProgram methods. The same behaviour can be achieved now by using the enable_logs() and disable_logs() methods, which use the standard Python logging.

Changelog:

• Fix issue with passing the hpc parameters to the API.

Changelog:

• support for hpc backend parameters.

Changelog:

• Support for proxies when connecting to the API.

Changelog:

• Bump the default max_credits for a more streamlined usage.

Changelog:

• add support for the IBM Q features.

Changelog:

• Fix error in evaluating Pauli-list style Hamiltonian (#155)

Changelog:

• Fix a bug with the super() call at qiskit/extensions/standard/cxbase.py

Changelog:

• fix a bug with the creation of the auto-generated parsetab.py file in multi-user environments.

Chemistry and optimization tools updated!

Changelog:

• parsertab.py auto-generated file is now being created in the temporary dir