Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Effects I

Q 16.3: Talk

Tuesday, March 15, 2022, 11:00–11:15, Q-H13

Quantum pulses in non-Markovian waveguide QED — •Kisa Barkemeyer, Andreas Knorr, and Alexander Carmele — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

Waveguide quantum electrodynamics (QED) systems, where emitters interact with the electromagnetic field confined to a one-dimensional geometry, are a promising platform for the implementation of quantum networks. If memory effects cannot be neglected, non-Markovian approaches have to be employed. In this regime, coherent time-delayed feedback allows controlling the system dynamics while preserving quantum coherence, and characteristic features such as the formation of bound states in the continuum can be observed.

In this talk, we discuss the strongly entangled system-reservoir state in waveguide QED systems with coherent time-delayed feedback. Thereby, we focus on the role of quantum pulses to describe the transmission of quantum information in a fully quantized manner. We employ different methods, an approach based on the time evolution with matrix product states [1,2] and a Heisenberg-picture approach [3], which complement each other and allow an in-depth study of various aspects of non-Markovian waveguide QED with multiphoton pulses.

[1] K. Barkemeyer, A. Knorr, and A. Carmele, Phys. Rev. A 103, 033704 (2021).

[2] S. Arranz Regidor, G. Crowder, H. Carmichael, and S. Hughes, Phys. Rev. Research 3, 023030 (2021).

[3] K. Barkemeyer, A. Knorr, and A. Carmele, arXiv:2111.02816.