pennylane

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MCM - tree-traversal implementation of native MCM execution

1

### 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...

vincentmr

[BUG] Uncompatibility between "qml.density_matrix" and "default.mixed" in jax.jit

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### Expected behavior Works without problems. ### Actual behavior Error. More info below. ### Additional information As you can see in the source code; tracing out qubits, the mixed device...

erikrecio

`QNode` defers diff method validation to the device

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[sc-56106] **Context:** The new device interface allows devices to support a variety of device gradient methods, each with different requirements on the circuit. For example, backprop is considered `"best"` for...

albi3ro

Implement SpectralNormError

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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...

AmintorDusko

[BUG] Default qubit measure tests include expression missing negative (works because n_wires is even)

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### Expected behavior In test/devices/qubit/test_measure.py TestSumOfTermsDifferentiability.expected(scale, coeffs, n_wires) with n_wires not even should give: ```phase = offset + scale * qml.math.asarray(range(n_wires), like=like) cosines = qml.math.cos(phase) sines = -qml.math.sin(phase) return coeffs[0]...

Gabriel-Bottrill

Possibility of Qubit, Qutrit and Qudit(when qudit device added) Interaction

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### Feature details I know that for now we don't have qudit devices, but we already have qubit and qutrit devices, but we can only use qubits interacting with qubits...

ArturDomingues

Compute expectation value

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**Context:** It would be nice to have a function to calculate the expectation values of an operator $A$ given a state vector $\vert\psi\rangle$. This can be also used for computing...

ludmilaasb

Update measurement process constructor function signatures

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**Context:** Measurement process constructor functions (`qml.sample`, `qml.probs`, etc) are inconsistent with respect to the order of the arguments given to them, which causes problems like potentially using observables as wires....

mudit2812

[BUG] string wires do not work with qml.measure

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### Expected behavior This toy example should return [1,0] ```python import pennylane as qml dev = qml.device("default.qubit") @qml.qnode(dev) def circuit(): qml.measure(wires = "my wire") return qml.probs(wires = "my wire") circuit()...

KetpuntoG

`defer_measurements` improvements

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**Context:** `defer_measurements` had some restrictions added to it due to the changes needed for the new features that have been added. This includes not supporting custom wire labels, and some...

mudit2812