Dr
Anita
Dąbrowska
Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdańsk, Poland
The evolution of an open quantum system can be effectively studied using the repeated interaction model, also referred to in the literature as the collision model. In this approach, the system’s environment-represented by a propagating electromagnetic field-is modeled as a chain of qubits or harmonic oscillators that interact sequentially with the quantum system. Starting from a discrete-time description of the composite system's evolution, one ultimately arrives at a continuous-time model.
This framework can be applied to both classical and non-classical field states. The properties of the output field-that is, the field after interacting with the system-can be determined using stochastic methods. During the seminar, I will present results for the case in which the field is prepared in a two-photon state. I will show how stochastic tools can be used to determine both the state of the open system and the properties of the output field.
In the second part, I will show how quantum trajectories can be applied to compute the probability of two-photon absorption. I will also present results concerning the optimal excitation of a three-level atom using two-photon light, and show how time-frequency-entangled photons can be utilized in this process. The presentation is based on the results of two publications.
[1] A. Dąbrowska and G. Sarbicki, arXiv:2409.07428
[2] M. Valipour, G. Sarbicki, K. Słowik, and A. Dąbrowska Phys. Rev. A 111, 033709, 2025.
This is a hybrid event:
Room D, the Institute of Physics PAS, Al. Lotników 32/46
Online: Zoom Link, (Passcode: 134595, Meeting ID: 823 8038 0442)
