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Release 0.12.0-dev

New features since last release

Breaking changes

Improvements

Documentation

Bug fixes

Contributors

This release contains contributions from (in alphabetical order):

Release 0.11.0

New features since last release

  • Qiskit devices now support custom wire labels. (#99) (#100)

    One can now specify any string or number as a custom wire label, and use these labels to address subsystems on the device:

    dev = qml.device('qiskit.ibmq', wires=['q1', 'ancilla', 0, 1])

def circuit():
  qml.Hadamard(wires='q1')
  qml.CNOT(wires=[1, 'ancilla'])

Improvements

  • Adds support for Qiskit v0.20. (#101)

Bug fixes

  • When converting QASM or Qiskit circuit to PennyLane templates, the CU1 gate is now natively supported and converted to a QubitUnitary. (#101)

Contributors

This release contains contributions from (in alphabetical order):

Maria Schuld, Antal Száva

Release 0.9.0

New features since last release

Breaking changes

  • Now supports Qiskit version 0.19.1. As a result of breaking changes within Qiskit, version 0.18 and below are no longer supported. (#81) (#85) (#86)

Improvements

  • Ported the QiskitDevice class to inherit from the QubitDevice class defined in PennyLane to use unified qubit operations and ease development. (#83)

  • Added a test for returning probabilities when using the IBMQDevice. (#82)

Documentation

  • Major redesign of the documentation, making it easier to navigate. (#78) (#79)

Bug fixes

  • Added a type conversion of parameters for parametrized gates, and renamed various gates for Qiskit version 0.18.0 support. (#81)

  • Renamed QiskitDevice.probabilities to QiskitDevice.probability to overload pennylane.Device.probability. This fixes a bug that raises NotImplementedError when a QNode is used to compute probabilities on a IBMQ device. (#80)

Contributors

This release contains contributions from (in alphabetical order):

Rafael Haenel, Josh Izaac, Maria Schuld, Antal Száva

Release 0.8.2

Bug fixes

  • Fixed a bug where users with IBMQ tokens linked to multiple providers would experience an error. (#74)

Contributors

This release contains contributions from (in alphabetical order):

Antal Száva

Release 0.8.1

Bug fixes

  • Fixed a bug where gradient computations always returned 0 when loading a parametrized Qiskit circuit as a PennyLane template. (#71)

Contributors

This release contains contributions from (in alphabetical order):

Josh Izaac

Release 0.8.0

Bug fixes

  • Removed v1 IBMQ credentials, disallowed unitary_simulator backend to have memory=True and discontinuing support for QubitStateVector on the unitary_simulator backend due to Qiskit's 0.14.0 version. #65

Contributors

This release contains contributions from (in alphabetical order):

Antal Száva

Release 0.7.1

Bug fixes

  • Set analytic=False as default, since by default warnings are raised for hardware simulators. #64

Contributors

This release contains contributions from (in alphabetical order):

Antal Száva

Release 0.7.0

New features since last release

  • Added the ability to automatically convert Qiskit QuantumCircuits or QASM circuits directly into PennyLane templates. The loaded operations can be used directly inside PennyLane circuits. #55

  • Updated the list of operations such that each operation is now used from PennyLane. Added capability to specify the inverses of operations. #58

Improvements

  • Added integration tests for converting objects from Qiskit using PennyLane. #57

  • Added warnings for hardware simulators using analytic==True when calculating expectations and variances. #59

Bug fixes

  • Removed gates.py including operations Rot and BasisState such that these operations are decomposed by PennyLane and no errors arise for the BasisState initialized with all-zero states. #60

Contributors

This release contains contributions from (in alphabetical order):

Antal Száva

Release 0.6.0

New features since last release

  • All Qiskit devices now support tensor observables using the return expval(qml.PauliZ(0) @ qml.Hermitian(A, [1, 2])) syntax introduced in PennyLane v0.6.

Contributors

This release contains contributions from (in alphabetical order):

Josh Izaac

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