Pennylane-qulacs

Improvements

* Adds the compatibility tag for Python 3.10 and removed it for 3.6.
[(31)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/31)

Bug fixes

* Defines the missing `returns_state` entry of the `capabilities` dictionary of
the device.
[(36)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/36)

* Updates the plugin to be compatible with the use of `Operator.eigvals` as a method.
[(35)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/35)

Contributors

This release contains contributions from (in alphabetical order):

Christina Lee, Antal Száva

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Improvements

* Adds the compatibility tag for Python 3.9.
[(28)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/28)

Bug fixes

* Fixed an issue where the wrong results are returned when passing non-consecutive wires to `QubitStateVector`.
[(25)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/25)

* Fixed issue where a state cannot be loaded into a Qulacs circuit when using a subset of wires with `BasisState`.
[(26)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/26)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Romain Moyard

Breaking changes

* Removed the `analytic` argument to reflect the [shots
refactor](https://github.com/PennyLaneAI/pennylane/pull/1079) in PennyLane. Analytic expectation
values can still be computed by setting `shots=None`.
[(21)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/21)

Contributors

This release contains contributions from (in alphabetical order):

Maria Schuld

Bug fixes

* Adjusted the matrix for the `CRZ` operation used internally.
[(18)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/18)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Antal Száva

Improvements

* Speeds up the computation of expectation values by using native Qulacs methods.
[(12)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/12)

Documentation

* Updates the installation instructions, to indicate how to install the PennyLane-Qulacs
plugin with either the CPU or GPU version of Qulacs.
[(14)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/14)

* Adds note to the documentation showing how to use multiple OpenMP threads by setting the
`OMP_NUM_THREADS` environment variable.
[(14)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/14)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Maria Schuld.

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Initial public release.

Contributors

This release contains contributions from:

Theodor Isacsson, Steven Oud, Maria Schuld, Antal Száva