Identical emitters of light in open quantum systems
Doktorsavhandling, 2024

The development of quantum mechanics has drastically changed the perspective on how we perceive the world. This has created a world that is now racing for the next new quantum technology. Accompanying this racing is an explosion of technological advancements that have facilitated experimental studies of light and matter interactions with unprecedented control down to the nanoscale. Improved experimental control and resolution, as well as the demonstration of strong light-matter interactions in new platforms, open the possibility of discovering unconventional phenomena that previously have been overlooked.

This thesis explores light and matter phenomena with identical emitters of light and light confined in a cavity. The work is divided into two parts. The first part looks at the correlations that can arise between two-level emitters and a cavity field, and the complex behaviors arising from the competition between coherent driving, collective coupling, and dissipation. The second part revolves around the intriguing properties of polaritons formed due to the interaction between a microcavity and the collective bright mode in an array of harmonic nanoresonators, sustaining surface plasmon modes.
The effects of dissipation are an important recurring theme.

Quantum Plasmonics

Collective effects

Hopfield Model

Open Quantum Systems


Strong Coupling

Cavity QED

Ultrastrong Coupling

Tavis--Cummings model

Nonequilibrium Critical Phenomena

Quantum Optics


Therese Karmstrand

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Unconventional saturation effects at intermediate drive in a lossy cavity coupled to few emitters

Physical Review A,; Vol. 108(2023)

Artikel i vetenskaplig tidskrift

Characterization of the output field in the driven-dissipative Tavis–Cummings model, Therese Karmstrand, Maryam Khanahmadi, Zeidan Zeidan, and Göran Johansson

Successive quasienergy collapse and breakdown of photon blockade in the few-emitter limit, Therese Karmstrand, Göran Johansson and Ricardo Gutierrez-Jauregui, J. Opt. Soc. Am. B 41, C38-C47 (2024)

Polaritonic linewidth asymmetry in the strong and ultrastrong coupling regime

Nanophotonics,; Vol. 12(2023)p. 4073-4086

Artikel i vetenskaplig tidskrift

In the fast-evolving landscape of quantum technologies, the interaction between light and matter is at the forefront of exploration. ``Identical Emitters of Light in Open Quantum Systems'' delves into this captivating realm where quantum emitters, ranging from atoms to excitons and metallic nanoparticles, engage in an intricate interplay with confined light within cavities. Inspired by state-of-the-art experiments, this thesis's theoretical work navigates two distinct pathways of inquiry. First, it explores the intricate correlations that emerge when small groups of quantum emitters are coupled to a single cavity mode, probing their collective behavior.
Secondly, the thesis investigates the phenomenon of strong and ultrastrong coupling with plasmonic nanoresonators within a microcavity, giving rise to hybridized light-matter states known as polaritons.
In an era where quantum technologies intersect with the inevitable influence of the environment, the works in this thesis concern open quantum systems. While traditionally viewed as sources of decoherence, the interactions with the environment are reconsidered as sources for stabilization of quantum states, with potential for engineering. By unraveling the delicate interplay between quantum systems and their surroundings, this work illuminates pathways toward novel quantum technologies, and deepens our understanding of the fundamental processes that settle the behaviors of complex interacting systems of light and matter.


Nanovetenskap och nanoteknik


Grundläggande vetenskaper


Atom- och molekylfysik och optik

Annan fysik



Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5521



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