Pennylane-rigetti

Improvements

* Remove the use of the deprecated function `qml.map` in the tests
[(129)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/129)

* Update logic in the tests to reflect the new PennyLane return type system
[(129)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/129)

Contributors

This release contains contributions from (in alphabetical order):

Matthew Silverman

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Breaking changes

* `pennylane-rigetti` no longer supports `python3.7`. A newer python version is required.
[(121)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/121)

Improvements

* Build dependency specification is now solely in `requirements.txt`, which is read by `setup.py`.
[(120)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/120)

* Removed the use of in-place inversion for PennyLane operations.
[(122)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/122)

Bug fixes

* A missing comma has been added to the version bounds on `qcs-api-client`.
[(120)](https://github.com/PennyLaneAI/pennylane-rigetti/pull/120)

Contributors

This release contains contributions from (in alphabetical order):

Albert Mitjans Coma
Graham Enos
Mudit Pandey

---

New features since last release

Re-introduction of the Rigetti Quantum Proccessing Unit (QPU) device

This release uses the latest version of [pyQuil](https://github.com/rigetti/pyquil)
to connect to [Rigetti Quantum Cloud Services (QCS)](https://docs.rigetti.com/qcs/)
and enables the use of the latest [Rigetti QPUs](https://qcs.rigetti.com/qpus)
as a PennyLane device.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

Breaking changes

* The package has been renamed to `pennylane-rigetti`. The top level import is now
`pennylane_rigetti`. In addition, the prefix for device short names have been
changed to `rigetti`. For example, `rigetti.qpu`.
[110](https://github.com/PennyLaneAI/pennylane-forest/pull/110)

* A new version of the QCS CLI is required if you want to use your QCS account
to run your workloads on a live Rigetti QPU. See
[Using the QCS CLI](https://docs.rigetti.com/qcs/guides/using-the-qcs-cli) for
details.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

* The `forest_url` parameter has been removed, as it is now managed by the QCS CLI.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

* The `compiler_url` and `qvm_url` device parameters have been removed. The default
URLs can be overridden using the `QCS_SETTINGS_APPLICATIONS_PYQUIL_QUILC_URL`
and `QCS_SETTINGS_APPLICATIONS_PYQUIL_QVM_URL` environment variables,
respectively.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

* The `timeout` parameter for all devices has been renamed to
`compiler_timeout`.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

* There is now a default execution timeout of 10 seconds. This can be configured
for a device by using the new `execution_timeout` parameter.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

* The `S`, `T`, `CSWAP`, `ISWAP`, and `CCNOT` operations have been removed.
Import them directly from `pennylane` instead.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

Improvements

* Improves the computation of the expectation value when using `QPUDevice` by
skipping the `Device.generate_samples` method.
[108](https://github.com/PennyLaneAI/pennylane-forest/pull/108)

Bug fixes

* The QPU device now correctly sets the number of shots when parametric
compilation is disabled.
[107](https://github.com/PennyLaneAI/pennylane-forest/pull/107)

Contributors

This release contains contributions from (in alphabetical order):

Albert Mitjans Coma, Antal Szava, Marquess Valdez.

---

Bug fixes

* Defines the missing `state` method and `returns_state` entry of the
`capabilities` dictionary for `forest.wavefunction` and
`forest.numpy_wavefunction`.
[(101)](https://github.com/PennyLaneAI/pennylane-forest/pull/101)

Contributors

This release contains contributions from (in alphabetical order):

Antal Száva.

---

Bug fixes

* Fix a bug where array parameters where not accepted when building circuits on
pyQuil side.
[(90)](https://github.com/PennyLaneAI/pennylane-forest/pull/90)

Improvements

* Added support for Python 3.10.
[(96)](https://github.com/PennyLaneAI/pennylane-forest/pull/96)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard.

---

Breaking changes

* Deprecated Python 3.6.
[(85)](https://github.com/PennyLaneAI/pennylane-forest/pull/85)

Improvements

* Removed a validation check for ``QubitUnitary`` that is now in PennyLane
core.
[(74)](https://github.com/PennyLaneAI/pennylane-forest/pull/74)

Bug fixes

* Pins the PyQuil version to use as `pyquil>=2.16,<2.28.3` due to API
deprecations in PyQuil version 3.0.
[(73)](https://github.com/PennyLaneAI/pennylane-forest/pull/77)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Romain Moyard, Antal Száva.

---