Digital Quantum Simulation of the Nonlinear Lindblad Master Equation Based on Quantum Trajectory Averaging

Abstract: Since precisely controlling dissipation in realistic environments is challenging, digital simulation of the Lindblad master equation (LME) is of great significance for understanding nonequilibrium dynamics in open quantum systems. However, achieving long-time simulations for complex systems with multiple dissipation channels remains a major challenge, both theoretically and experimentally. Here, we propose a 2-dilation digital simulation scheme for the non-linear Lindblad master equation (NLME) based on quantum trajectory averaging. The NLME continuously interpolates between full LME and the dynamical equation governed by the effective non-Hermitian Hamiltonian. Remarkably, for standard LMEs, our scheme reduces to a 1-dilation method that enables deterministic realizations without postselection. This deterministic nature overcomes a key limitation in some existing simulation methods, where repeated postselections lead to exponentially vanishing implementation probabilities. Consequently, our scheme allows efficient long-time simulations of LMEs with multiple jump operators. As a demonstration, we present numerical experiments simulating novel theoretical predictions in open quantum systems, including localization in open quantum systems and the postselected skin effect.