WaveguideQED.jl

WaveguideQED.jl is a package for simulating continuous fockstates in waveguides. It expands on QuantumOptics.jl by adding a custom basis and operators for efficiently representing time-binned photon states.

Citing

If you find the package usefull in your research. Please consider citing: https://quantum-journal.org/papers/q-2025-04-17-1710/.

Dev docs

Added functionalities:

• WaveguideBasis for representing the waveguide Hilbert space and the related functions for generating states in this Hilbert space: zerophoton, onephoton, and twophoton. Also see OnePhotonView, TwoPhotonView, and plot_twophoton! for viewing the waveguide states and plotting them. Note that WaveguideBasis can contain multiple waveguides.
• WaveguideOperator are specialized operators allowing efficient annihilation and creation operators at each time-bin in the waveguide. They are created by giving a basis to WaveguideQED.destroy and WaveguideQED.create
• Since the interaction between the waveguide time-bin mode $k$ and cavity/emitter is given as: $a^\dagger w_k - a w_k^\dagger$ there are specially optimized functions for doing these operations called CavityWaveguideOperator which are created using a fockbasis and a waveguide basis and the functions emission and absorption.
• (OBSOLETE. SEE Beamsplitter INSTEAD). Detector, LazyTensorKet, and LazySumKet, together with detect_single_click and detect_double_click allow one to do a beamsplitter interference and subsequent detection of photons coming from two waveguides.