Two-level tunneling system analysis using brillouin spectroscopy

Martinez Lopez, Verenise (2023) Two-level tunneling system analysis using brillouin spectroscopy. Masters thesis, Northern Arizona University.

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Abstract

Being able to sustain quantum states for long periods of time in a laboratory setting can enable a new era of fast performing computing and secure communication. However, decoherence induced from low-energy defects limits quantum states to relatively short lifetimes and poses critical challenges for wide-scale application of quantum technology [1; 2; 3] . The core mechanism of this challenge has to do with noise induced from two-level tunneling states (TLS) at low-cryogenic temperature. The dissipation and noise is induced by interactions between TLS’s and phonons found in amorphous materials. Recent theories show that TLS dynamics can be radically altered in reduced dimensional structures such as waveguides, nano electro-mechanical systems (NEMS), or nano resonators [4; 5; 6; 7; 8]. In our studies we conduct detailed noise measurements arising from TLS phonon dissipation via Brillouin spectroscopy. By looking at phonon dissipation rates at various cryogenic temperatures and comparing their trend with the expected TLS phonon attenuation rate we uncover the temperature scaling laws for dissipative and dispersive shifts in frequency in optical fibers. Our results show expected temperature dependence in TLS acoustic attenuation in a UHNA7 fiber and form the building blocks for uncovering the impact phonon confinement has on TLS physics.

Item Type:	Thesis (Masters)
Publisher’s Statement:	© Copyright is held by the author. Digital access to this material is made possible by the Cline Library, Northern Arizona University. Further transmission, reproduction or presentation of protected items is prohibited except with permission of the author.
Keywords:	Brillouin Scattering; Photonics
Subjects:	Q Science > QC Physics
NAU Depositing Author Academic Status:	Student
Department/Unit:	Graduate College > Theses and Dissertations College of the Environment, Forestry, and Natural Sciences > Physics and Astronomy
Date Deposited:	19 May 2025 17:32
Last Modified:	19 May 2025 17:32
URI:	https://openknowledge.nau.edu/id/eprint/6161

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