Add keyword argument assume_hermitian to liouvillian

[ytdHuang]

Checklist

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Description

Start from QuTiP v5.2.1, they have generalize the definition of liouvillian as

$$\mathcal{L} [\cdot] =-i\left(\hat{H}[\cdot] - [\cdot]\hat{H}^\dagger\right)$$

see also the PR in qutip: qutip/qutip#2658

That is, we should at least allow users to disable the assumption that the Hamiltonian is Hermitian. This could be beneficial for people working on non-Hermitian physics.

[ytdHuang]

I think we need to set compat SciMLOperators = "1.10", otherwise the dynamical solver will not work after this PR.

[albertomercurio]

Ok, I made a PR in SciMLOperators.jl

SciML/SciMLOperators.jl#323

This fixes all the benchmark regressions. I don't understand if the Zygote and Enzyme autodiff are also fixed. We should see it once we re-trigger the benchmarks.

[Copilot]

Pull Request Overview

This PR adds a keyword argument assume_hermitian to the liouvillian function, aligning with QuTiP v5.2.1's generalized Liouvillian definition. This allows users working with non-Hermitian physics to disable the Hermitian assumption for Hamiltonians.

• Modified the liouvillian function to accept assume_hermitian parameter (default: Val(true))
• Updated internal _liouvillian implementations to handle both Hermitian and non-Hermitian Hamiltonians
• Upgraded SciMLOperators dependency from 1.4 to 1.11 to support updated operator representations

Reviewed Changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/qobj/superoperators.jl	Core implementation of assume_hermitian parameter for Liouvillian construction, including updated documentation and optimized tuple handling for collapse operators
src/time_evolution/mesolve.jl	Updated to use QuantumObjectEvolution constructor for consistency
src/time_evolution/time_evolution_dynamical.jl	Adapted to SciMLOperators 1.11 changes (MatrixOperator → ScaledOperator), updating field access from .A to .L
test/core-test/quantum_objects_evo.jl	Added comprehensive tests for assume_hermitian parameter, including operator structure verification and type inference tests
test/core-test/time_evolution.jl	Added integration tests for assume_hermitian = Val(false) with time-dependent Hamiltonians; updated operator type assertions for SciMLOperators 1.11
test/ext-test/cpu/autodiff/autodiff.jl	Extended autodiff tests (Zygote and Enzyme) to verify compatibility with non-Hermitian Liouvillians
Project.toml	Bumped SciMLOperators version requirement from 1.4 to 1.11
CHANGELOG.md	Documented the new assume_hermitian feature
src/settings.jl	Minor whitespace cleanup

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