Abstract Quadratic Lindbladians encompass a rich class of dissipative electronic and bosonic quantum systems. which have been predicted to host new and exotic physics. In this study. we develop a Lindblad-Keldysh spectroscopic response formalism for open quantum systems that elucidates their steady-state response properties and dissipative phase transitions via finite-frequency linear... https://foldlyers.shop/product-category/phone-wallplates/