Subradiant states in waveguide quantum electrodynamics

Waveguide quantum electrodynamics (WQED) is a rapidly developing field of quantum optics that studies the interaction of propagating photons with localized quantum emitters, such as atoms, superconducting qubits, and quantum dots [1]. The emergence of novel experimental platforms with highly coherent and ordered atomic emitter arrays has stimulated a new wave of interest in the classical problem of quantum optics: enhancement and suppression of spontaneous emission via constructive and destructive interference of photons from different emitters. Subradiant states that form because of such destructive interference provide important insights into the collective light-matter interactions and also promise applications for the storage and processing of quantum light.

 In this talk, I will try to review recent theoretical and experimental progress in the study of subradiant states in waveguide setup. I will start with the basic concepts of wave interference that explain the formation of subradiant states in the single-photon regime. Next, I will discuss multiple-excited subradiant states [2,3] and subradiant states in the strongly driven systems [4]. I will demonstrate that the dependence of the lifetime of the correlations on the driving strength and the array period can be strongly nonmonotonous and is rather sensitive to the details of many-body interactions in the array.

 References

           [1]           A.S. Sheremet, M.I. Petrov, I.V. Iorsh, A.V. Poshakinskiy, A.N. Poddubny, Rev. Mod. Phys. 95, 015002 (2023)

          [2]           A.V. Poshakinskiy and A.N. Poddubny, Phys. Rev. Lett. 127, 173601 (2021)

          [3]           J. Shi and A.N. Poddubny, Phys. Rev. A 110, 053707 (2024)

          [4]            A.N. Poddubny, Phys. Rev. A 106, L031702 (2022)