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Autoregressive Projective Quantum Monte Carlo: From a Hermitian to a Non-Hermitian Perspective
Lavoisier Wah, Remmy Zen, Flore K. Kunst
Accurately determining the ground-state properties of quantum many-body systems remains a central challenge. In this work, we introduce an autoregressive projective quantum Monte C…
Bridging Frustration and Non-Hermiticity via COMPASS: An Adaptive Biorthogonal Neural Quantum State Framework
Lavoisier Wah, Flore K. Kunst, Mohamed Hibat-Allah
In this work, we introduce a complementary optimization method for progressive and adaptive state search (COMPASS) based on biorthogonal adaptive recurrent neural quantum states. O…
Atom-Photon Bound States in Fractal Photonic Lattices: Localization Length and Anomalous Diffusion
Florian Bönsel, Flore K. Kunst, Federico Roccati
We study atom-photon bound states seeded by two-level emitters coupled to self-similar photonic lattices. By expressing the photonic Green's function through the heat kernel, we sh…
Birefringent Curvature Control of Surface Plasmons and Collective Emission
Florian Bönsel, Flore K. Kunst
We present a generic wave equation for surface plasmon polaritons on any macroscopically curved metal-dielectric interface, with isotropic and anisotropic geometric potentials line…
Fibonacci Waveguide Quantum Electrodynamics
Florian Bönsel, Flore K. Kunst, Federico Roccati
Waveguide quantum electrodynamics (QED) provides a powerful framework for engineering quantum interactions, traditionally relying on periodic photonic arrays with continuous energy…
Many-Body Neural Network Wavefunction for a Non-Hermitian Ising Chain
Lavoisier Wah, Remmy Zen, Flore K. Kunst
Non-Hermitian (NH) quantum systems have emerged as a powerful framework for describing open quantum systems, non-equilibrium dynamics, and engineered quantum optical materials. How…
The non-Hermitian skin effect: A perspective
Julius T. Gohsrich, Ayan Banerjee, Flore K. Kunst
The non-Hermitian (NH) skin effect is a truly NH feature, which manifests itself as an accumulation of states, known as skin states, on the boundaries of a system. In this perspect…
Spectral Riemann Sheet Topology of Gapped Non-Hermitian Systems
Anton Montag, Alexander Felski, Flore K. Kunst
We show topological configurations of the complex-valued spectra in gapped non-Hermitian systems. These arise when the distinctive EPs in the energy Riemann sheets of such models a…
Essential implications of similarities in non-Hermitian systems
Anton Montag, Flore K. Kunst
In this paper, we show that three different generalized similarities enclose all unitary and anti-unitary symmetries that induce exceptional points in lower-dimensional non-Hermiti…
Bound states and photon emission in non-Hermitian nanophotonics
Zongping Gong, Miguel Bello, Daniel Malz +1
We establish a general framework for studying the bound states and the photon-emission dynamics of quantum emitters coupled to structured nanophotonic lattices with engineered diss…
Anomalous Behaviors of Quantum Emitters in Non-Hermitian Baths
Zongping Gong, Miguel Bello, Daniel Malz +1
Both non-Hermitian systems and the behaviour of emitters coupled to structured baths have been studied intensely in recent years. Here we study the interplay of these paradigmatic…
Symmetry-protected exceptional and nodal points in non-Hermitian systems
Sharareh Sayyad, Marcus Stalhammar, Lukas Rodland +1
One of the unique features of non-Hermitian~(NH) systems is the appearance of non-Hermitian degeneracies known as exceptional points~(EPs). The extensively studied defective EPs oc…
Realizing exceptional points of any order in the presence of symmetry
Sharareh Sayyad, Flore K. Kunst
Exceptional points~(EPs) appear as degeneracies in the spectrum of non-Hermitian matrices at which the eigenvectors coalesce. In general, an EP of order may find room to emerge…