Alexander Poddubny Group

Research

In recent years, the quantum physics landscape has been reshaped by the emergence of diverse artificial quantum optical systems. In these systems, photons interact with multiple emitters—be it atoms, superconducting qubits, solid-state defects, or quantum dots. An intriguing aspect of these interactions is the reabsorption of emitted photons by remote emitters, initiating a photon-mediated coupling across significant distances. This long-range, collective coupling introduces unique properties to atom-photon systems.

We study theoretically various phenomena found within arrays of photon emitters, including both natural and artificial atoms, lasers, and particularly within topologically complex lattices. Our main setup is an array of emitters coupled to waveguide as in the video above. Our mission is two-fold: to advance the fundamental understanding of intricate quantum systems from the perspectives of quantum optics, nonlinear and many-body physics, and to provide a solid theoretical foundation for the development of emerging quantum technologies. We actively collaborate with experimental groups both at Weizmann and across the globe.

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News

August 7, 2026

Two new preprints on non-Hermitian physics

August 7, 2026

Informal talk at the Technion by Ma'ayan

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Latest Publications

No oscillating subradiant correlations in a strongly driven quantum emitter array

Shi J., Leppenen N., Tessler R. & Poddubny A. N. (2026) Physical Review A. 113, 6, 063702.

We theoretically study time-dependent correlations in a strongly driven array of N two-level atoms collectively coupled to photons. We focus on the spectrum {lambda} of the Liouvillian superoperator. Our main finding is the suppression of subradiant oscillating correlations between atomic states by a strong coherent drive: The correlation decay rates-Re lambda are lower bounded by thresholds proportional to their oscillation frequencies Im lambda and are larger than half of the single-atom decay rate. We demonstrate this limit numerically for various one-, two-, and three-dimensional arrays. In the one-dimensional case of atoms coupled to the waveguide we also provide a rigorous proof based on the analytical decomposition of the Liouvillian using spectral theory of simplicial complexes and partially ordered sets. This limit is independent of the number of atoms N; it holds both for small arrays and in the macroscopic limit.

Parametric resonant enhancement of motional entanglement under optimal control: An analytical study

Horovitz G. & Poddubny A. N. (2026) Physical Review A. 113, 5, 053521.

We present a theoretical study of entanglement between the continuous motional degrees of freedom of two massive, optically trapped particles coupled via the Coulomb interaction in the presence of optimal control. We analytically investigate the effect of temporal modulation on the entanglement strength and derive closed-form expressions for the conditional entanglement. These expressions not only reproduce the numerical results, but also explicitly reveal that entanglement emerges from the competition between parametric gain and decoherence.

Persistent subradiant correlations in a disordered ensemble of collectively driven quantum emitters

Leppenen N. & Poddubny A. N. (2026) Physical Review A. 113, 2, 023709.

We theoretically study the driven-dissipative dynamics of an array of two-level emitters coupled to a single photonic mode in the presence of disorder in the resonant frequencies. We introduce the notion of subradiant correlations in the dynamics, corresponding to the eigenstates of the Liouvillian with a low decay rate, that can also oscillate in time. While the usual collective subradiant states do not survive under emitter resonant frequency fluctuations, these subradiant correlations are immune to this type of disorder. We employ the group representation theory to find the number of nontrivial oscillating subradiant correlations in the system. These long-living correlations exist in finite-size systems, when their lifetime is parametrically longer than in the socalled Dicke time crystal phase.

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