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loggamma poisson for coherentstate! #239

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loggamma poisson for coherentstate!
ChristophHotter Jul 2, 2026
462a629
using SpecialFunctions
ChristophHotter Jul 2, 2026
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2 changes: 1 addition & 1 deletion src/QuantumOpticsBase.jl
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
module QuantumOpticsBase

using SparseArrays, LinearAlgebra, LRUCache, Strided, UnsafeArrays, FillArrays
using SparseArrays, LinearAlgebra, LRUCache, Strided, UnsafeArrays, FillArrays, SpecialFunctions
import LinearAlgebra: mul!, rmul!
import RecursiveArrayTools

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18 changes: 7 additions & 11 deletions src/fock.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -179,18 +179,14 @@ function coherentstate!(ket::Ket, b::FockBasis, alpha::Number)
T = real(C)
alpha = C(alpha)
data = ket.data
data[1] = exp(-abs2(alpha)/2)

# Compute coefficient up to offset
λ = abs2(alpha)
ϕ = angle(alpha)
offset = b.offset
@inbounds for n=1:offset
data[1] *= alpha/sqrt(T(n))
end

# Write coefficients to state
@inbounds for n=1:b.N-offset
data[n+1] = data[n]*alpha/sqrt(T(n+offset))
display(b.N)
@inbounds for n=offset:b.N
i=n-offset+1
data[i] = sqrt(poisson(n,λ))*exp(1im*ϕ*n)
end

return ket
end
poisson(k,λ) = exp(k*log(λ) - λ - loggamma(k+1))
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