Pennylane-cirq

Improvements

* Changed to using `cirq_pasqal` instead of `cirq.pasqal` as per a deprecation
cycle in Cirq.
[(90)](https://github.com/PennyLaneAI/pennylane-cirq/pull/90)

* Changed the requirements of PennyLane-Cirq to only contain `cirq-core` and
`cirq-pasqal`.
[(94)](https://github.com/PennyLaneAI/pennylane-cirq/pull/94)

Contributors

This release contains contributions from (in alphabetical order):

Jay Soni, Antal Száva

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Improvements

* Expectation values are now computed using the `simulate_expectation_values`
function from Cirq for `cirq.simulator` and `cirq.mixedsimulator`.
[(81)](https://github.com/PennyLaneAI/pennylane-cirq/pull/81)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard

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Improvements

We support `Cirq` version `0.12.0`.
[(77)](https://github.com/PennyLaneAI/pennylane-cirq/pull/77)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard

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Breaking changes

We do not support the new `Cirq` version `0.12.0` because of
compatibility problems with `qsim`.
[(73)](https://github.com/PennyLaneAI/pennylane-cirq/pull/73)

Contributors

This release contains contributions from (in alphabetical order):

Romain Moyard

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New features

* Added support for the new `qml.Projector` observable in
PennyLane v0.16 to the Cirq devices.
[(62)](https://github.com/PennyLaneAI/pennylane-cirq/pull/62)

Breaking changes

* Deprecated Python 3.6.
[(65)](https://github.com/PennyLaneAI/pennylane-cirq/pull/65)

Bug fixes

* Fix data type bug for mixed simulator when using `QubitStateVector`.
[(63)](https://github.com/PennyLaneAI/pennylane-cirq/pull/63)

* Fixed issue when using a subset of wires with `BasisState`.
[(61)](https://github.com/PennyLaneAI/pennylane-cirq/pull/61)

Contributors

This release contains contributions from (in alphabetical order):

Theodor Isacsson, Romain Moyard, Vincent Wong

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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`.
[(57)](https://github.com/PennyLaneAI/pennylane-cirq/pull/57)
[(58)](https://github.com/PennyLaneAI/pennylane-cirq/pull/58)

Contributors

This release contains contributions from (in alphabetical order):

Josh Izaac, Chase Roberts

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