David Wierichs

Add test of broadcasting support to device test suite

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This PR adds a test to the `devices/tests` suite that makes sure that 1. Broadcasted QNode executions can be handled 2. If the device claims to support broadcasting, `broadcast_expand` is...

Enable parameter broadcasting in embedding templates

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Here we introduce broadcasting to the embedding templates - `AmplitudeEmbedding` - `AngleEmbedding` - `IQPEmbedding` - `QAOAEmbedding` For `BasisEmbedding`, detection of broadcasting based on hyperparameters instead of parameters would be required,...

The Rotosolve demo should cite all four of the independently inventing papers: [Vidal and Theis, 2018](https://arxiv.org/abs/1812.06323) [Nakanashi, Fujii and Todo, 2019](https://arxiv.org/abs/1903.12166) (or [PRResearch](https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.043158)) [Parrish, Iosue, Ozaeta and McMahon, 2019](https://arxiv.org/abs/1904.03206) [Ostaszewski,...

This is a demo on the updated `RotosolveOptimizer`, complementary to `tutorial_rotoselect` (which also contains Rotsolve for Pauli rotations) and `tutorial_general_parshift` (which details the function reconstruction for more general gates).

Incorporate DOI links to arxiv articles

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Recently, the arxiv introduced automatic DOI links to all it's preprints. The quantum bibstyle could be adapted to use these links automatically. This is mostly a formality, in order to...

[BUG] `QuantumTape.diagonalizing_gates` returns wrong result when observables include `Hamiltonian`

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### Expected behavior The property `QuantumTape.diagonalizing_gates` always either returns the correct diagonalizing gates or raises an error (warning) if they are unknown. ### Actual behavior When measuring, say, the expectation...

Add `has_decomposition` and `has_adjoint` attributes

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Here we add the `Operator` attributes `has_decomposition` and `has_adjoint` in analogy to `has_matrix`. They allow faster decisions of whether a decomposition/adjoint is available than calling `decomposition/adjoint` and catching exceptions. Similar...

Hessian diagonal via adjoint method

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### Before submitting Please complete the following checklist when submitting a PR: - [x] All new features must include a unit test. If you've fixed a bug or added code...

Allow different degrees for different parameters in Fourier tools

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### Before submitting Please complete the following checklist when submitting a PR: - [x] All new features must include a unit test. If you've fixed a bug or added code...

### Feature details As of #2810, embedding templates support parameter broadcasting, including `AmplitudeEmbedding` except for usage with Tensorflow, which is raising a dedicated error currently. To reach feature parity, one...