Data and code for Fig. 4 of "Non-diagonal Lindblad master equations in quantum reservoir engineering"

This record contains the data and Julia code used to generate Fig. 4 of the article "Non-diagonal Lindblad master equations in quantum reservoir engineering" by D. N. Bernal-García, L. Huang, A. E. Miroshnichenko, and M. J. Woolley (arXiv:2111.04041). The data are computed from the analytical steady-state covariance matrix of the two-mode optomechanical example of Sec. VI of the article, obtained by solving the algebraic Lyapunov equation. The script computes the Duan quantity and the bosonic logarithmic negativity as functions of the absorption-spectrum asymmetry and the drive asymmetry. Version 2 supersedes version 1. Version 1 assigned the two off-diagonal elements of the decoherence matrix the wrong way round, which makes the matrix indefinite away from the symmetric point, and it used the drive asymmetries of an earlier version of the figure. Version 2 corrects the assignment and uses the drive asymmetries plotted in the revised Fig. 4, G+/G− = 0.3, 0.6, 0.8, 0.9. The README lists the changes. The deposit includes: - fig4_generate_data.jl: Julia script used to generate the data (standard library only). - fig4_data.csv: the generated data plotted in Fig. 4. - README.md: description of the files, the parameters, the changes from version 1, and reproduction instructions.