Simulation methods for non-Gaussian states in coherent state decomposition

Abstract: In this project, we present a numerical library for the simulation of continuous-variable circuits that incorporate both Gaussian and non-Gaussian elements, as well as Gaussian noise channels. The library pairs the sum-of-Gaussian methods in strawberryfields with new developments in state representation, namely that arbitrary superpositions of Fock states can be approximated by superposition of coherent states on a small ring in phase space [Marshall and Anand (2023)]. Our simulation package provides a fast alternative to photon number basis simulations of multi-mode mixed states. The utility of the package is demonstrated with a couple of use-cases, namely i) optimisation of circuits for optical GKP preparation, ii) simulation of noisy squeezed cat breeding.
 
Jeffrey Marshall and Namit Anand, "Simulation of quantum optics by coherent state decomposition," Optica Quantum 1, 78-93 (2023)

This seminar is part of a visit sponsored by WACQT’s Guest Researcher Programme (GRP).