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Release 0.5.1

Bug fixes

  • Fixed a bug where backend keyword arguments, such as backend_options and noise_model, were being passed to backends that did not support it. #51

Contributors

This release contains contributions from (in alphabetical order):

Josh Izaac

Release 0.5.0

This is a significant release, bringing the plugin up to date with the latest PennyLane and Qiskit features.

New features since last release

  • The plugin and the tests have been completely re-written from scratch, to ensure high quality and remove technical debt. #44 #43

  • Samples and variance support have been added to all devices. #46

  • Multi-qubit hermitian observables are now supported, due to support being added in Qiskit version 0.12.

  • Support has been added for IBM Q Experience 2.0. #44

Improvements

  • Hardware and software devices are now treated identically, with expectations, variance, and samples computed via the probability, not the amplitudes. This has several consequences:

    • It makes the code cleaner and simpler, as there is now one defined way of computing statistics.

    • It is faster in most cases, as this does not require computing large matrix-vector products, or Kronecker products. Instead, eigenvalues of single- and multi-qubit observables are computed using dyanamic programming.

    • It reduces the number of tests required.

  • Test suite now includes tests against the IBM Q Experience, in addition to the local simulators.

Bug fixes

  • Due to the move to IBM Q 2.0 credentials, users remaining with IBM Q v1.0 now must pass an additional URL argument to the service. The plugin has been modified to allow the user to pass this argument if required. #44

Contributors

This release contains contributions from:

Shahnawaz Ahmed, Josh Izaac

Release 0.0.8

New features since last release

  • Added noise model and backend options to the devices as well as new observables.
  • Added support for all PennyLane observables for calculating expectation values.
  • Added (copied & adjusted from pennylane-forest) test for the expectation values.
  • Added the necessary DefaultQubit device for comparison.
  • Added logging.

Improvements

  • Changed expval_queue to obs_queue and expectations to observables as per latest pennylane.
  • Reversed qregs to match the default qubit device behavior.
  • Renamed devices correctly.
  • Made wires explicit. If num_wires of operation is 0 then use the whole system as wires!
  • Renamed the IBMQ device from qiskit.ibm to qiskit.ibmq.

Fixed

  • Fixed the Unitary gate.
  • Fixed the token loading and the shots.
  • Fixed and updated to qiskit v0.10.1
  • Fixed the valid expectation values of all devices. Along with it tests where fixed.

Removed

  • Removed the IBMQX_TOKEN import and replace with the correct args.
  • Removed the unconditional make coverage.
  • Removed default qubit device, this is not tested in this package!

Release 0.0.7

Removed

  • Removed the LegacySimulatorsQiskitDevice as this isn't supported in qiskit anymore.

Improvements

  • updated to qiskit version 0.10.*.

Release 0.0.6

Added

  • Added the noise model to BasicAerQiskitDevice and AerQiskitDevice with unit tests (#13)
  • Added unit tests for the docs (#7/#20)

Fixed

  • Fixed the ''multiple'' backends keyword bug (#13).
  • Fixed the par_domain of the operations (real valued parameters) in pos.py (#21)
  • Fixed documentation problems
  • Started to 'fix' ''low'' code quality due to type hints with codacy (#15)
  • Small typos and code cleanups

Release 0.0.5

New features

  • AerQiskitDevice and LegacySimulatorQiskitDevice with tests

Fixed

  • Readme & documentation
  • setup.py
  • Code style clean-ups & code cleaning.
  • Build setup with travis CI
  • Removed unsied num_runs kwargs
  • Fixed the overlapping kwargs with
  • Better tests taken from the ProjectQ plugin
  • remove the sleep after computation.

Release 2018-12-23

New features

  • The device IbmQQiskitDevice now can load the ibmqx_token from the environment variabe IBMQX_TOKEN

Improvements

  • Renamed psops to qisktops
  • The setup/build requirements are now read from requirements.txt. The file is included now in the distribution file.
  • Due to changes in qiskit (0.7.0) the Device AerDevice must be correctly termed to BasicAerDevice
  • Due to the removal of qiskit.unroll.CircuitBackend the complete plugin logic needed an overhaul. Now the QuantumCircuit is used in conjunction with the new converters dag_to_circuit and circuit_to_dag as well as the usage of the base class Instruction. We hope that this change will work for most cases.

Fixed

  • The Readme: links and the usage of device instead of provider, to stay in PennyLane-lingo
  • Update to qiskit 0.7.0 made changes necessary: import location have changes