Quantum computation approaches for modeling photon-mediated operations in quantum information processing

We implement, quantum algorithms compatible with existing NISQ (noisy intermediate state quantum) systems, to solve fundamental quantum optics models describing essential photon-mediated operations in quantum information processing. Such solutions allow us to reliably characterize the validity of conventional approximations that often limit the scope of analytical/numerical solutions. We illustrate the method by assessing spontaneous emission from the Weisskopf-Wigner model when it is applied to a finite number of radiation modes coupled to one or multiple quantum emitters. We further solve the problem of spectral modulation with a pulse sequence and we particularly examine the effect of the rotating wave approximation on the emission spectrum of quantum emitters driven by optical pulses. We find that the quantum algorithms provide a reliable and intuitive characterization of the physical system, alongside a satisfactory agreement with various classical computing algorithms in their regime of validity.