Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 33: Open Quantum Systems
Q 33.1: Talk
Wednesday, March 13, 2024, 14:30–14:45, HS 1199
Multimode-cavity picture of non-Markovian waveguide QED — Luca Ferialdi1, •Dario Cilluffo2, G. Massimo Palma1,3, Giuseppe Calajò4, and Francesco Ciccarello1,3 — 1Università degli Studi di Palermo, Dipartimento di Fisica e Chimica Emilio Segrè, via Archirafi 36, I-90123 Palermo, Italy — 2Institut für Theoretische Physik and IQST, Albert-Einstein-Allee 11, Universität Ulm, 89069 Ulm, Germany — 3NEST, Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, 56127 Pisa, Italy — 4Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Padova, I-35131 Padova, Italy
We introduce a picture to describe and intrepret waveguide-QED problems in the non-Markovian regime of long photonic retardation times (resulting in delayed coherent feedback). The framework is based on an intuitive spatial decomposition of the waveguide into blocks. Among these, the block directly coupled to the atoms embodies an effective lossy multimode cavity leaking into the rest of the waveguide (in turn embodying an effective white-noise bath). The dynamics can be approximated by retaining only a finite number of cavity modes that yet eventually grows with the time delay. The picture allows to explicitly connect emission properties subject to feedback to the standard Purcell effect in a cavity, both in the usual bad-cavity limit and beyond, thus providing an explicit link between waveguide QED and cavity QED.
Keywords: Waveguide QED; Cavity QED; Non-Markovian; Delay