Southwest Quantum Information and Technology

Effects of reservoir correlations in non-Markovian atomic collective decay

Presenting Author: Alberto Del Angel Medina, Universidad Nacional Autonoma de Mexico
Contributing Author(s): Pablo Solano, Pablo Barberis Blostein

The Born and Markov approximations play a central role when deriving the master equations of interacting emitters coupled with waveguides. In this work, we calculate the zero-temperature correlation functions of the fundamental guided mode of an optical nanofiber, which acts as the reservoir of one and two interacting atoms. By numerically solving the atomic evolution equations in the non-Markovian regime, we study how its collective behavior establishes when separated at distances close to their resonant wavelength. We find a significant delay between the onset of the atom-atom interaction and a complete super(sub)radiant decay. We observe slight deviations in these decay rates compared to the predictions given by the Markov approximation. Our results also allow us to identify the regimes for which it's valid to regard the correlation functions as displaced delta distributions, an approximation commonly used in waveguide QED. Our work provides a deeper understanding of the collective interaction mechanism in this platform and the approximations used in its description.

(Session 5 : Thursday from 5:00 pm - 7:00 pm)