Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Delay and Feedback Dynamics

DY 33.7: Talk

Tuesday, March 13, 2018, 15:30–15:45, BH-N 334

Feedback enhanced quantum beating due to resonant dipole-dipole coupling — •Manuel Kraft¹, Tymoteusz Tula², Kisa Barkemeyer¹, Anja Metelmann³, Andreas Knorr¹, and Alexander Carmele¹ — ¹TU Berlin, Institute of Theoretical Physics — ²Wroclaw University of Science and Technology, Faculty of Fundamental Problems of Technology — ³Princeton University, Department of Electrical Engineering

We investigate the propagation of few-photon Fock-states in a one-dimensional waveguide scattered by two dipole-dipole coupled atoms. Using a scattering method based on the Lippmann-Schwinger equation [1], we study photon-photon correlations of the photons in the reflected and transmitted field. Depending on the dipole-dipole interaction strength, we observe highly damped oscillations in the second-order correlation function. To increase the visibility, we introduce quantum coherent time-delayed feedback [2] by terminating one end of the waveguide by a resonator, acting as a mirror. Our results clearly show that the dipole-dipole induced quantum beats can be intensified and stabilized where the long-time beating frequency is sensitive to the dipole-dipole interaction strength. Since the interaction strength depends strongly on the separation of the emitters, our method may provide a way to probe interatomic coupling and distances on a deep subwavelength scale.

[1] Zheng et al., Phys. Rev. Lett. 110, 113601 (2013)
[2] Carmele, et al. Phys. Rev. Lett. 110, 013601 (2013)