pennylane

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[lie_closure1] Add qml.dla.VSpace class for keeping track of linearly independent vectors

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This class enables easy implementation for `qml.dla.lie_closure` realized in the follow-up PR. The class VSpace is currently not (yet) user-facing and acts as a utility to lie_closure. We could consider...

Qottmann

qutrit mixed state sampling

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**Context:** Necessary next step in `qutrit_mixed` device development, allows for sampling a quantum circuit on the mixed state. This will be necessary to simulate sampling a qutrit device. **Description of...

Gabriel-Bottrill

Qutrit mixed simulate

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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...

Gabriel-Bottrill

[lie_closure2] Add `qml.dla.lie_closure` function

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[WIP] - [x] Basic functionality - [x] Basic tests - [x] compatibility with PauliWord + tests - [x] compatibility with Operators + tests - [ ] Figure out normalization standard...

Qottmann

[BUG] Issue calculating `qml.qinfo.transforms.quantum_fisher`

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### Expected behavior Hello! I’m currently trying to use `qml.qinfo.transforms.quantum_fisher` to calculate the quantum Fisher information matrix (QFIM) of a certain circuit called `U1_qfi`. However, I’m having an issue with...

NickGut0711

### Expected behavior `Snapshot` should return the measurement result or raise an error if the device is not compatible. ### Actual behavior If the device is `dafault.mixed`, `Snapshot` will return...

ludmilaasb

Add grouping functionality to `Sum`

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

mudit2812

Entanglement entropy of pure bipartite states

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**Context:** [Quantifying the entanglement](https://www.quantiki.org/wiki/entanglement-measure) for example by determining the [entropy of entanglement](https://en.wikipedia.org/wiki/Entropy_of_entanglement) of bipartite quantum states can be useful for applications of quantum information (e.g., in quantum cryptography). One way...

astralcai

### 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...

Gabriel-Bottrill

This PR integrates `draw` and `draw_mpl` with `qml.workflow.construct_batch`. It does so by adding a `level` keyword that can be a special string, int, `None` or `slice`. Note that currently `None`...

albi3ro