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updating qeye_like and qzero_like. #637

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updating qeye_like and qzero_like. #637

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Optimize `liouvillian_dressed_nonsecular`: avoid O(N⁴) dense filter matrices. ([#627])
- Restrict `CUDA.jl` version compatibility to < 5.9.6 due to breaking changes in that release. ([#630])
- Move from `JuliaFormatter.jl` to `Runic.jl` for code formatting. ([#633])
- Updated `qeye_like` to properly handle `QobjEvo` types.

## [v0.40.0]
Release date: 2025-12-21
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9 changes: 9 additions & 0 deletions src/qobj/arithmetic_and_attributes.jl
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Expand Up @@ -751,3 +751,12 @@ _dims_and_perm(::Operator, dims::SVector{2, SVector{N, Int}}, order::AbstractVec
_order_dimensions(dimensions::Dimensions, order::AbstractVector{Int}) = Dimensions(dimensions.to[order])
_order_dimensions(dimensions::GeneralDimensions, order::AbstractVector{Int}) =
GeneralDimensions(dimensions.to[order], dimensions.from[order])


_find_matrix(A::AbstractArray) = A
_find_matrix(A::MatrixOperator) = A.A
_find_matrix(A::ScaledOperator) = _find_matrix(A.L)
function _find_matrix(A::Union{AddedOperator, ComposedOperator})
idx = findfirst(x -> _find_matrix(x) isa AbstractMatrix, A.ops)
return _find_matrix(A.ops[idx])
end
4 changes: 2 additions & 2 deletions src/qobj/synonyms.jl
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Expand Up @@ -115,7 +115,7 @@ Return a similar [`AbstractQuantumObject`](@ref) with `dims` and `type` are same

Note that this function is same as `one(A)` and only supports for [`Operator`](@ref) and [`SuperOperator`](@ref).
"""
qeye_like(A::AbstractQuantumObject{OpType}) where {OpType <: Union{Operator, SuperOperator}} = one(A)
qeye_like(A::AbstractQuantumObject{OpType}) where {OpType <: Union{Operator, SuperOperator}} = QuantumObject(one(_find_matrix(A.data)), A.type, A.dimensions)

@doc raw"""
qzero_like(A::AbstractQuantumObject)
Expand All @@ -124,4 +124,4 @@ Return a similar [`AbstractQuantumObject`](@ref) with `dims` and `type` are same

Note that this function is same as `zero(A)` and only supports for [`Operator`](@ref) and [`SuperOperator`](@ref).
"""
qzero_like(A::AbstractQuantumObject{OpType}) where {OpType <: Union{Operator, SuperOperator}} = zero(A)
qzero_like(A::AbstractQuantumObject{OpType}) where {OpType <: Union{Operator, SuperOperator}} = QuantumObject(zero(_find_matrix(A.data)), A.type, A.dimensions)