Neill Lambert

Taking more than one gradient fails with default RecursiveCheckpointAdjoint

2

I am a total beginner with Jax and diffrax, not sure if this is a bug or expected, but if i try to find the second or higher derivative of...

### Bug Description The function `negativity() ` is currently broken because of a broken import of `partial_transpose()`. This is probably an easy fix and good first issue, but more importantly...

Enforce CoreOptions(default_dtype) more broadly?

10

### Bug Description When setting `CoreOptions(default_dtype)` I expect all quantum objects to inherit the specified dtype. States and operators defined in states.py and operators.py do so but some functions return...

ENR states errors with v5 solvers

4

### Bug Description ENR states and operators produce an error when used with v5 solvers (mesolve and mcsolve at least, sesolve seems ok). Key feature of ENR states is that...

Counting statistics functions bug fixing and extensions

3

Measuring the statistics of electron transport though nanostructures has been found to be a powerful experimental tool to gather information about such structures. The functions in countstat.py return the first...

saving a circuit with latex method as a PDF fails

1

If a user wants to call `circuit.draw(renderer="latex", file_type="pdf", file_name="circuit")` it fails with `TypeError: TeXRenderer._convert_pdf() takes 1 positional argument but 2 were given` This is because https://github.com/qutip/qutip-qip/blob/7633f6e4dbae7e6931eda800df21d42016df8431/src/qutip_qip/circuit/texrenderer.py#L267C4-L267C33 is called with a...

Add first drafts of tutorial notebooks for HEOM input output feature. These require https://github.com/qutip/qutip/pull/2590 to function. Todo list: - [ ] Improve and expand explanation of both notebooks (the Markovian...

Add Input-Output HEOM feature

1

**Checklist** - [ ] Complete tests (partially done) - [ ] Add documentation - [ ] Change log **Description** This is a first attempt at adding support for what is...

histogram animations are animated incorrectly

1

### Bug Description When making an animation with the histogram function the result is very strange, it plots each bar or block separately, while leaving the rest of the frame...

### Bug Description When calling 'steadystate()' for large Hilbert space sizes with operators built out of DIA, we often hit a memory error. This line: https://github.com/qutip/qutip/blob/dbabe79ddcb5e50d97ec75dee77e93498c57a96c/qutip/solver/steadystate.py#L225 Seems to be the...