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Release 0.40.0-dev

New features since last release

Improvements 🛠

Breaking changes 💔

Deprecations 👋

Documentation 📝

Bug fixes 🐛

Contributors ✍️

This release contains contributions from (in alphabetical order):

Release 0.39.0

Improvements 🛠

  • Make qiskit_session available top-level. Users can now import it as pennylane_qiskit.qiskit_session. (#593)

Breaking changes 💔

  • Remove support for Python 3.9. (#597)

  • Upgrade minimum supported version of PennyLane to 0.38.0. (#599)

Documentation 📝

  • Added warning in the documentation of qiskit_session due to recent reports of unexpected behavior. (#594)

Bug fixes 🐛

  • Fix deprecated import path for QubitDevice. (#584)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Astral Cai Lillian M. A. Frederiksen Austin Huang Mudit Pandey

Release 0.38.1

Bug fixes 🐛

  • Due to the removal of the Session and Backend keywords in the 0.30 release of qiskit-ibm-runtime, the PennyLane-Qiskit plugin now pins to qiskit-ibm-runtime<=0.29. (#587)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Austin Huang Mudit Pandey

Release 0.38.0

New features since last release

  • Added support for converting Qiskit noise models to PennyLane NoiseModels using load_noise_model. (#577) (#578)

  • Qiskit Sessions can now be used for the qiskit.remote device with the qiskit_session context manager. (#551)

Improvements 🛠

  • Qiskit Runtime Primitives are supported by the qiskit.remote device. Circuits ran using the qiskit.remote device will automatically call the SamplerV2 and EstimatorV2 primitives appropriately. Additionally, runtime options can be passed as keyword arguments directly to the qiskit.remote device. (#513)

Breaking changes 💔

  • Support has been removed for Qiskit versions below 0.46. The minimum required version for Qiskit is now 1.0. If you want to continue to use older versions of Qiskit with the plugin, please use version 0.36 of the Pennylane-Qiskit plugin. (#536)

  • The test suite no longer runs for Qiskit versions below 0.46. (#536)

  • The qiskit.basicaer device has been removed because it is not supported for versions of Qiskit above 0.46. (#546)

  • The IBM quantum devices, qiskit.ibmq, qiskit.ibmq.circuit_runner and qiskit.ibmq.sampler, have been removed due to deprecations of the IBMProvider and the cloud simulator "ibmq_qasm_simulator". (#550)

Documentation 📝

  • The Pennylane-Qiskit plugin page has been updated to reflect the changes in both the plugin's capabilities and Qiskit. #563

Contributors ✍️

This release contains contributions from (in alphabetical order):

Utkarsh Azad Lillian M. A. Frederiksen Austin Huang

Release 0.37.0

Improvements 🛠

  • Updated load_qasm to take the optional kwarg measurements which get performed at the end of the loaded circuit and load_qasm can now detect mid-circuit measurements from qasm. (#555)

  • Improvements have been made to load circuits with SwitchCaseOp gates with default case. (#514)

Contributors ✍️

This release contains contributions from (in alphabetical order): Utkarsh Azad Lillian M. A. Frederiksen Austin Huang Mashhood Khan

Release 0.36.0

New features since last release

  • Support is added for using the plugin devices with Qiskit 1.0. As the backend provider qiskit.BasicAer is no longer supported by Qiskit in 1.0, this added support does not extend to the "qiskit.aer" device. Instead, a "qiskit.basicsim" device is added, with the new Qiskit implementation of a Python simulator device, BasicSimulator, as the backend. (#493)

  • Backwards compatibility with Qiskit BackendV2 has now been implemented. Previously, only backends of type BackendV1 were supported but now users can choose to use BackendV2 as well. (#514)

Improvements 🛠

  • Following updates to allow device compatibility with Qiskit 1.0, the version of qiskit-ibm-runtime is no longer capped. (#508)

  • The test suite now runs with the most recent qiskit and qiskit-ibm-runtime, and well as with 'qiskit==0.45' and qiskit-ibm-runtime<0.21 to monitor backward-compatibility. (#508)

Contributors ✍️

This release contains contributions from (in alphabetical order): Lillian M. A. Frederiksen Austin Huang

Release 0.35.1

Bug fixes 🐛

  • Following the 0.21 release of qiskit-ibm-runtime, which requires Qiskit 1.0, the PennyLane-Qiskit plugin pins to qiskit-ibm-runtime<0.21. This prevents pip install pennylane-qiskit from installing Qiskit 1.0 (via the requirements of qiskit-ibm-runtime), which will break any environments that already have a 0.X.X version of Qiskit installed. (#486)

Contributors ✍️

Lillian Frederiksen

Release 0.35.0

Improvements 🛠

  • The UI for passing parameters to a qfunc generated when loading a Qiskit QuantumCircuit into PennyLane is updated to allow passing parameters as args or kwargs, rather than as a dictionary. The old dictionary UI continues to be supported. (#406) (#428)

  • Measurement operations are now added to the PennyLane template when a QuantumCircuit is converted using load. Additionally, one can override any existing terminal measurements by providing a list of PennyLane measurements <https://docs.pennylane.ai/en/stable/introduction/measurements.html>_ themselves. (#405) (#466) (#467)

  • Added the support for converting conditional operations based on mid-circuit measurements and two of the ControlFlowOp operations - IfElseOp and SwitchCaseOp when converting a QuantumCircuit using load. (#417) (#465)

  • Qiskit's classical Expr conditionals can also be used with the supported ControlFlowOp operations. (#432)

  • Added conversion support for more Qiskit gates to native PennyLane operations - Barrier, CYGate, CHGate, CPhase, CCZGate, ECRGate, and GlobalPhaseGate. (#449)

  • Added the ability to convert a Qiskit SparsePauliOp instance into a PennyLane Operator. (#401) (#453)

  • Added a pennylane.io entry point for converting Qiskit operators. (#453)

  • Unused parameters are now ignored when a QuantumCircuit is converted using load. (#454)

Bug fixes 🐛

  • QiskitDevice.batch_execute() now gracefully handles empty lists of circuits. (#459)

  • It is now possible to compute the gradient of a circuit with ParameterVector elements. (#458)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Mikhail Andrenkov Utkarsh Azad Lillian Frederiksen

Release 0.34.0

Bug fixes 🐛

  • The kwargs job_tags and session_id are passed to the correct arguments in the circuit_runner device so that they will be used in the Qiskit backend; these were previously ignored. (#358)

  • The generate_samples method for the IBMQSamplerDevice is updated to get counts from the nearest probability distribution rather than the quasi-distribution (which may contain negative probabilities and therefore raise errors). (#357)

  • The generate_samples method for the IBMQSamplerDevice now avoids raising an indexing error when some states are not populated, and labels states according to the Pennylane convention instead of Qiskit convention. (#357)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Lillian Frederiksen Francesco Scala

Release 0.33.1

Improvements 🛠

  • Stop using the now-deprecated tape.is_sampled property. (#348)

Bug fixes 🐛

  • Update conversion of PennyLane to Qiskit operators to accommodate the addition of Singleton classes in the newest version of Qiskit. (#347)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Lillian Frederiksen, Matthew Silverman

Release 0.33.0

Improvements 🛠

  • Logic updated to support Aer V2 device naming conventions. (#343)

Breaking changes 💔

  • The old return type system has been removed. (#331)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Mudit Pandey, Matthew Silverman

Release 0.32.0

Improvements 🛠

  • Added support for qml.StatePrep as a state preparation operation. (#326)

Breaking changes 💔

  • Support for Python 3.8 has been removed. (#328)

Contributors ✍️

This release contains contributions from (in alphabetical order):

Mudit Pandey, Jay Soni,

Release 0.31.0

New features since last release

  • Added a RemoteDevice (PennyLane device name: qiskit.remote) that accepts a backend instance directly. (#304)

Breaking changes

  • The vqe_runner has been removed, as the Qiskit Runtime VQE program has been retired. (#313)

Bug fixes

  • The list of supported gates is replaced with pennylane.ops._qubit__ops__ so that the CZ gate is included. (#305)

Contributors

This release contains contributions from (in alphabetical order):

Matthew Silverman, Frederik Wilde, Etienne Wodey (Alpine Quantum Technologies GmbH)

Release 0.30.1

Breaking changes

  • vqe_runner has been updated to use IBMQ's VQE program. The first argument, program_id, has now been removed. The upload_vqe_runner and delete_vqe_runner functions have also been removed. (#298)

Improvements

  • Updated many small things across the plugin to match re-works and deprecations in qiskit. The plugin can still be used in the same way as before. However, we suggest you authenticate with qiskit_ibm_provider.IBMProvider instead of qiskit.IBMQ from now on, as the latter is deprecated. (#301)

Contributors

This release contains contributions from (in alphabetical order):

Matthew Silverman

Release 0.30.0

Breaking changes

  • The new return system from PennyLane is adopted in the plugin as well. (#281)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard.

Release 0.29.0

Breaking changes

  • .inv is replaced by qml.adjoint in PennyLane 0.30.0 and therefore the plugin is adapted as well. (#260)

  • The minimum required version of PennyLane is bumped to 0.28. The current plugin does not work with PennyLane v0.27.

Bug fixes

  • The number of executions of the device is now correct. (#259)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee Romain Moyard

Release 0.28.0

Breaking changes

  • Changed the signature of the QubitDevice.statistics method from

    def statistics(self, observables, shot_range=None, bin_size=None, circuit=None):

    to

    def statistics(self, circuit: QuantumScript, shot_range=None, bin_size=None):

    #3421

Improvements

  • Adds testing for Python 3.11. (#237)

Bug fixes

  • Do not try to connect with an IBMQX token if it is falsy. (#234)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee Albert Mitjans-Coma Matthew Silverman

Release 0.27.0

New features since last release

  • Add support for the ISWAP operation. (#229)

Bug fixes

  • Fix Cobyla success bool for VQE runtime. (#231)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard, Matthew Silverman

Release 0.24.0

Improvements

  • Improvement of the different requirements.txt and requirements-ci.txt files. (#212)

  • The plugin now natively supports the adjoint of the S, T, and SX gates. (#216)

Documentation

Bug fixes

  • Defines the missing returns_state entry of the capabilities dictionary for devices. (#220)

Contributors

This release contains contributions from (in alphabetical order):

Mikhail Andrenkov, Christina Lee, Romain Moyard, Antal Száva

Release 0.23.0

New features since last release

  • Add support for the operationsIsingXX, IsingYY, IsingZZ (#209)

Bug fixes

  • Fix runtime sampler due to changes on Qiskit side. (#201)

  • Pin jinja2 to 3.0.3 because of sphinx incompatibility. (#207)

Contributors

This release contains contributions from (in alphabetical order):

Samuel Banning, Romain Moyard

Release 0.22.0

Improvements

  • Changed a validation check such that it handles qubit numbers represented as strings. (#184)

  • Changed the VQE callback function for SciPy optimizers. (#187)

  • Switched from using the deprecated qiskit.circuit.measure.measure function to using a method. (#191)

Bug fixes

  • Changed the access to Hamiltonian terms hamiltonian.terms() as a method. (#190)

Contributors

This release contains contributions from (in alphabetical order):

Thomas Bromley, Andrea Mari, Romain Moyard, Antal Száva

Release 0.21.0

New features since last release

  • Add two devices for runtime programs and one VQE runtime program solver. (#157)

Improvements

  • Improved the login flow when IBMQ tokens are specified as environment variables. (#169)

Documentation

  • Improved the quality of docstrings in the library. (#174)

Contributors

This release contains contributions from (in alphabetical order):

Guillermo Alonso-Linaje, Romain Moyard, Tanner Rogalsky, Jay Soni, Antal Száva

Release 0.20.0

New features since last release

  • Defined the QiskitDevice.batch_execute method, to allow Qiskit backends to run multiple quantum circuits at the same time. This addition allows submitting batches of circuits to IBMQ e.g., when computing gradients internally. (#156) (#163) (#167)

Improvements

  • Added native support for the qml.Identity operation to the Qiskit devices and converters. (#162)

  • Added support for the qml.SX operation to the Qiskit devices. (#158)

  • Added support for returning job execution times. (#160)

  • Added support for Python 3.10. (#170)

Contributors

This release contains contributions from (in alphabetical order):

Guillermo Alonso-Linaje, David Ittah, Romain Moyard, Antal Száva

Release 0.18.0

Improvements

  • Removed adding the verbose option to the arguments passed to the backend such that no warnings are raised. (#151)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Jay Soni, Antal Száva

Release 0.17.0

Improvements

  • Removed a validation check for qml.QubitUnitary that existed in the device and adjusted a related test case. (#144)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Antal Száva

Release 0.16.0

New features since last release

  • Added support for the new qml.Projector observable in PennyLane v0.16 to the Qiskit devices. (#137)

Breaking changes

  • Deprecated Python 3.6. (#140)

Improvements

  • The plugin can now load Qiskit circuits with more complicated ParameterExpression variables. (#139)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Vincent Wong

Release 0.15.0

Breaking changes

  • For compatibility with PennyLane v0.15, the analytic keyword argument has been removed from all devices. Statistics can still be computed analytically by setting shots=None. (#130)

Improvements

  • PennyLane-Qiskit has been upgraded to work with Qiskit version 0.25. (#132)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Olivia Di Matteo, Josh Izaac, Antal Száva

Release 0.14.0

Bug fixes

  • With the release of Qiskit 0.23.3 gate parameters cannot be arrays. The device now converts arrays to lists. (#126)

  • When parsing the IBMQ token and the IBMQ URL, the values passed as keywords take precedence over environment variables. (#121)

  • When loading Qiskit circuits to PennyLane templates using load in converter.py, parameters with requires_grad=False are bound to the circuit. The old version bound objects that were not PennyLane Variable's, but that object class is now deprecated. (#127)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Antal Szava

Release 0.13.0

Improvements

  • The provided devices are now compatible with Qiskit 0.23.1. (#116)

Bug fixes

  • The Aer devices store the noise models correctly. (#114)

Contributors

This release contains contributions from (in alphabetical order):

Olivia Di Matteo, Josh Izaac, Antal Száva

Release 0.12.0

Improvements

  • Qiskit devices are now allowed to pass transpilation options. (#108)

  • The provided devices are now compatible with Qiskit 0.23. (#112)

Bug fixes

  • Removes PySCF from the plugin setup.py and requirements.txt. (#103) (#104)

  • Fixed a bug related to extracting differentiable parameters for the Qiskit converter and PennyLane array indexing. (#106)

Contributors

This release contains contributions from (in alphabetical order):

Josh Izaac, Nathan Killoran, Sagar Pahwa, Antal Száva

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