SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster III
Q 42.5: Poster
Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof
Rydberg Dark States on an Atom Chain Interacting with a Chiral Waveguide — •Tom von Scheven1, Anne V. Jeschke1, Igor Lesanovsky1,2, and Beatriz Olmos1,2 — 1Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany — 2School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
We consider a laser-driven chain of atoms coupled to a chiral waveguide and investigate the possibility of creating so-called dark states, i.e. eigenstates of the atomic chain where the photons become trapped. Beyond their fundamental interest, atomic systems that host such dark states are nowadays widely investigated due to their potential applications in quantum information processing, e.g., as quantum memories. It has been previously found that, under the right combination of atomic and laser parameters, product states of entangled pairs (so-called dimer states) can be excited in a chain of two-level systems coupled to a chiral waveguide. Here, we analytically and numerically demonstrate the existence of a new class of entangled dark states by exploiting the strong interactions present in a chain of Rydberg atoms close to a waveguide. Compared to the dimer states, the conditions on the laser parameters necessary to excite a dark state (e.g. detuning pattern) are less restrictive. Moreover, these Rydberg dark states possess entanglement that is shared among all atoms are more robust against external perturbations, such as dissipation into unguided modes. Our results demonstrate the potential of using Rydberg atoms in quantum optical many-body systems in order to create dark states.