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Type promotion between MixedDestabilizer, Stabilizer and others, also used in ⊗ #354

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merged 10 commits into from
Sep 27, 2024
Merged

Type promotion between MixedDestabilizer, Stabilizer and others, also used in ⊗ #354

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7da1f9c
Bug fix to StackOverflowError for md ⊗ SX where typeof(md) is MixedDe…
Fe-r-oz Sep 7, 2024
bbb12df
Merge branch 'QuantumSavory:master' into i339
Fe-r-oz Sep 14, 2024
0435a8b
add code review suggestions
Fe-r-oz Sep 14, 2024
a06f66e
improve code formatting
Fe-r-oz Sep 14, 2024
be8ce6f
minor formatting
Fe-r-oz Sep 14, 2024
066d7c2
further polish
Fe-r-oz Sep 15, 2024
a30997b
remove nonsense code
Fe-r-oz Sep 15, 2024
cc5b84d
add code review suggestions: cut down on power_rules, simplify conver…
Fe-r-oz Sep 16, 2024
11376fd
revamp promote rules
Fe-r-oz Sep 17, 2024
99ab972
remove redundant comments and add back an incorrectly removed TODO
Krastanov Sep 27, 2024
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10 changes: 10 additions & 0 deletions src/QuantumClifford.jl
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Expand Up @@ -989,6 +989,16 @@ function _apply!(stab::AbstractStabilizer, p::PauliOperator, indices; phases::Va
stab
end

##############################
# Conversion and promotion
##############################

Base.promote_rule(::Type{<:Destabilizer{T}} , ::Type{<:MixedDestabilizer{T}}) where {T<:Tableau} = MixedDestabilizer{T}
Base.promote_rule(::Type{<:MixedStabilizer{T}}, ::Type{<:MixedDestabilizer{T}}) where {T<:Tableau} = MixedDestabilizer{T}
Base.promote_rule(::Type{<:Stabilizer{T}} , ::Type{<:S} ) where {T<:Tableau, S<:Union{MixedStabilizer{T}, Destabilizer{T}, MixedDestabilizer{T}}} = S

Base.convert(::Type{<:MixedDestabilizer{T}}, x::Union{Destabilizer{T}, MixedStabilizer{T}, Stabilizer{T}}) where {T <: Tableau} = MixedDestabilizer(x)

##############################
# Helpers for binary codes
##############################
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6 changes: 4 additions & 2 deletions src/linalg.jl
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Expand Up @@ -161,8 +161,10 @@ julia> tensor(s, s)
See also [`tensor_pow`](@ref)."""
function tensor end

function tensor(ops::AbstractStabilizer...) # TODO optimize this by doing conversion to common type to enable preallocation
foldl(⊗, ops[2:end], init=ops[1])
function tensor(ops::AbstractStabilizer...) # TODO optimize by pre-allocating one large tableau instead of the current quadratic fold
ct = promote_type(map(typeof, ops)...)
conv_ops = map(x -> convert(ct, x), ops)
return foldl(⊗, conv_ops)
end

"""Repeated tensor product of an operators or a tableau.
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6 changes: 6 additions & 0 deletions test/test_stabs.jl
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Expand Up @@ -55,6 +55,12 @@
stabs = [s[1:i] for s in [random_stabilizer(n) for n in [32,16,16,64,63,65,129,128,127]] for i in rand(1:10)];
mdstabs = MixedDestabilizer.(stabs);
@test canonicalize!(⊗(stabs...)) == canonicalize!(stabilizerview(⊗(mdstabs...)))
md = MixedDestabilizer(random_destabilizer(n))
s = random_stabilizer(n)
mds = md⊗s
@test mixed_destab_looks_good(mds)
estab = stabilizerview(md)⊗s
@test canonicalize!(copy(stabilizerview(mds))) == canonicalize!(estab)
end
end

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