Events Calendar

Physics Colloquium - Graduate Student Presentations (Turner / Simonson)

This is a past event.

Thursday, January 26, 2023, 4 pm– 5 pm

Event Details

This is a past event.

Please join physics graduate students, Rhiannon Turner and Lucas Simonson, for their in-person presentations Thursday, January 19th at 4 PM - Fisher Hall 139.

 

Disentangling Very-High-Energy Gamma-Ray Emission from SNR G106.3+2.7 Using the HAWC Observatory

Rhiannon Turner [Advisor: Dr. Petra Huentemeyer]

Supernova remnant (SNR) G106.3+2.7 has two distinct regions, the head and tail. The head region is home to a pulsar (J2229+6114) and its pulsar wind nebula (G106.65+2.95) dubbed the “Boomerang” nebula, while the tail region contains the diffuse ejecta from the SN event. This SNR has been long thought to be a prime candidate for accelerating cosmic-rays up to PeV energies, a source otherwise known as a PeVatron, but the complex nature of the region makes it difficult to determine if one, or both, of the regions are a Pevatron. Both regions have recently been separated in the very-high-energy gamma-ray regime by the MAGIC and Fermi-LAT observatories. However, due to poor angular resolution of higher energy detectors, the head and tail have not been separately identified above 30 TeV, making it difficult to distinguish a hadronic production mechanism over a leptonic mechanism. With more data and new reconstruction algorithms, including better angular resolution, the HAWC Observatory is now able to distinguish the head and tail regions of this SNR. We present the multi-wavelength modeling of both regions, as well as possible sources for CR acceleration.

 

 

Quantum Noise in Optical Amplifiers Operating at Exceptional Points

Lucas Simonson [Advisor: Dr. Ramy El-Ganainy]

The concept of exceptional points-based optical amplifiers (EPOAs) has been recently proposed as a new paradigm for miniaturizing optical amplifiers while simultaneously enhancing their gain-bandwidth product. While the operation of this new family of amplifiers in the classical domain provides a clear advantage, their performance in the quantum domain has not yet been evaluated. Particularly, it is not clear how the quantum noise introduced by vacuum fluctuations will affect their operation. We investigate this problem by considering two archetypal EPOAs structures and use the Heisenberg-Langevin formalism to calculate the added quantum noise in each of these devices. Our analysis reveals several interesting results: (1) The output noise level exceeds that of quantum-limited amplifiers; (2) The noise level does not follow a universal dependence on the order of the exceptional point but rather varies from one implementation to another.

 

 

 

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  • 1400 Townsend Drive

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