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Q: Fachverband Quantenoptik und Photonik

Q 69: Collective Effects and Disordered Systems

Q 69.1: Vortrag

Freitag, 6. März 2026, 11:00–11:15, P 2

Spontaneous symmetry breaking in nonlinear superradiance — •Nikolai Klimkin¹ and Mikhail Ivanov^1,2,3 — ¹Max Born Institute, Max-Born Straße 2A, 12489 Berlin, Germany — ²Institute of Physics, Humboldt University Berlin, 12489 Berlin, Germany — ³Technion - Israel Institute of Technology, 3200003 Haifa, Israel

Creation and manipulation of non-classical states of light is rapidly becoming the focus of modern attosecond science. Here, we demonstrate numerically how such states can arise by considering a modification of the well-known problem of superradiance encountered already by Dicke. Similarly to him, we investigate photon emission by ensembles of indistinguishable atoms. In contrast to him, however, we leverage symmetry-based selection rules to suppress emission of single photons by single atoms. A steady state is therefore only reached following a spontaneous transition into a collective symmetry-broken state of atoms and photonic modes. The novel non-Markovian, non-perturbative method applied allows us to observe a large quantum state of light form and exhibit drastically non-classical statistics once the system undergoes a symmetry-breaking transition.

Keywords: superradiance; Fock states; cavity QED; spin-boson model; spontaneous symmetry breaking