N = 10b = FockBasis(N)alpha = 0.4psi = coherentstate(b, alpha)a = destroy(b)A fock space describes the situation of variable particle number. I.e. the system can have zero particles, one particle, two particles and so on.
To create a basis of a Fock space QuantumOptics.jl provides the FockBasis class which has to be supplied with an integer specifying the maximum number of photons. It is defined as:
struct FockBasis <: Basis shape::Vector{Int} N::IntendSettings
This document was generated with Documenter.jl version 1.19.0 on Friday 11 September 2026. Using Julia version 1.13.0.
FockBasis(N,offset=0)Basis for a Fock space where N specifies a cutoff, i.e. what the highest included fock state is.
coherentstate([T=ComplexF64,] b::FockBasis, alpha)Coherent state for the specified Fock space.
destroy([T=ComplexF64,] b::FockBasis)Annihilation operator for the specified Fock space with optional data type T.
destroy([T=ComplexF64,] mb::ManyBodyBasis, index)Annihilation operator for the i-th mode of the many-body basis b.