Therese Karmstrand, MC2
Title: Cavity quantum electrodynamics in driven, strongly dissipative Tavis-Cummings systems
Therese is a PhD student at the Applied Quantum Physics Laboratory
Discussion leader: Dr. Neill W Lambert, senior research scientist, RIKEN, Japan
Main supervisor: Prof. Göran Johansson
Examiner: Prof. Mikael Fogelström
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Over the last few decades, great advancements in quantum technology have made quantum-by-quantum control of light fields an attainable goal on many different material platforms. The manipulation of light fields on the single-quantum level and the generation of nonclassical states of light lies at the heart of quantum optics and are important for many emerging quantum technologies including: Quantum information processing, computing, imaging and metrology.
One of the underlying motivations for the investigations in the appended paper to this thesis, is the growing interest for cavity quantum electrodynamics with lossy, hybrid light-matter cavities that utilizes surface-plasmon polaritons as the carrier of the light component. But also other platforms such as nitrogen-vacancy centers in diamond and localized excitons in hexagonal boron nitride could be suitable for our findings.
The aim of this thesis is to give an introduction to quantum-optical effects that could be exploited with cavity-emitters systems described by the Tavis--Cummings model. This introduction gives an extended background to the appended paper that investigates quantum-effects in a driven, strongly dissipative Tavis--Cummings system and in which an uncommon nonlinear effect is found in the intermediate drive regime. The observed effect shows a strong ensemble-size dependence in the resonant scattering properties of the coupled cavity-emitter system, where an emitter-ensemble of size N facilitates (N+1)-photon processes in the nonlinear regime. This strongly N-dependent effect could be used for characterization of cavity-emitter systems where the number of emitters is unknown. In the paper, it is also found that the emitter-ensemble of size N can be seen as a saturable mirror that can only reflect photon states up to order N. This additionally suggests that the studied systems have potential for quantum state engineering. The strong ensemble-size dependence is discussed in detail in the paper. To give a deeper context to this discussion, some of the fundamental differences for different number of emitters in the Tavis--Cummings model are also addressed in this thesis.
Kollektorn, lecture room, Kemivägen 9, MC2-huset