Classical simulation of non-Gaussian bosonic circuits
Beatriz Dias, Robert König · Physical Review A · 2024
The authors present efficient classical algorithms for simulating linear bosonic circuits applied to non-Gaussian states composed of superpositions of Gaussian states. Their approach, based on an augmented covariance matrix formalism, enables exact simulations with polynomial runtime in the number of modes and circuit size, and quadratic runtime in the number of superposition terms. They also present an approximate algorithm whose runtime is linear in the number of superposition terms.