Optimizing dynamical blockade via a particle-swarm-optimization algorithm

Photon blockade in weak nonlinear regime is an exciting and promising subject that has been extensively studied in the steady state. However, how to achieve dynamic blockade in a single bosonic mode with weak nonlinearity using only pulsed driving field remains unexplored. Here, we propose to optimize the parameters of the pulsed driving field to achieve dynamic blockade in a single bosonic mode with weak nonlinearity via the particle swarm optimization (PSO) algorithm. We demonstrate that both Gaussian and rectangular pulses can be used to generate dynamic blockade in a single bosonic mode with weak nonlinearity. Based on the Fourier series expansions of the pulsed driving field, we identify that there are many paths for two-photon excitation in the bosonic mode, even only driven by pulsed field, and the dynamic blockade in a weak nonlinear regime is induced by the destructive interference between them. Our paper not only highlights the effectiveness of PSO algorithm in optimizing dynamical blockade but also opens a probable way to optimize the parameters for other quantum effects, such as quantum entanglement and quantum squeezing.