Pennylane-qrack

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