Coherent feedback control and nonlinear optics in cavity QED systems
- In order to capitalize on their promise of high-bandwidth, ultra-low power operation, future nanophotonic devices will have to contend with quantum and coherent effects inherent to the small-volume, few-photon limit. The theoretical development of general, systematic frameworks for describing quantum feedback networks enables us to leverage established optical technologies, from single and multi-atom cavity quantum electrodynamics to ultrafast multimode optics, as an essential test bed for establishing direct contact between coherent-feedback control theory and first generation nanophotonic circuits. For interesting regimes for photonic logic, we want to work where switching energies become on the order of attojoules. Within atomic cavity QED systems, this regime occurs where the number of atoms within the typical cavity is on the order of 1-10. In this regime, each atom is a quantum emitter and must be treated with a full quantum model. As the atom number is increased, a mean field theory can be applied and the dynamics can be modeled using the optical Bloch equations. Full quantum modelling of systems with the atom number $> 10$ are not tractable computationally and a simpler semi-classical model does not fully capture the dynamics correctly. Thus we must investigate an intermediate regime where it may not be necessary to keep track of all quantum degrees of freedom and treat them semi-classically. I will present experimental data showing the effects of coherent feedback on a test cavity QED system alongside switching dynamics and other non-linear behavior in a few atom regime. Studying experimental data to help formulate new models will greatly help in the push towards practical optical non-linear systems for ultra low power photonic logic.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Sanghera, Hardeep Singh
|Stanford University, Department of Applied Physics.
|Bucksbaum, Philip H
|Bucksbaum, Philip H
|Statement of responsibility
|Hardeep Singh Sanghera.
|Submitted to the Department of Applied Physics.
|Thesis (Ph.D.)--Stanford University, 2016.
- © 2016 by Hardeep Singh Sanghera
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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