Physics

Experimental Characterization of Algorithms for Holographic Optical Trapping

Alyssa C. Barlis

We have experimentally characterized three algorithms for holographic optical trapping applications. Previous computational results based on a 10×10 square lattice of optical traps suggest a significant difference in algorithm performance. Our preliminary results, while inconclusive, show differences in mean trap stiffness for holograms calculated using each of the three algorithms. Modifications and improvements to the experimental setup are discussed, along with suggestions for future work.

 

b-philic Particles at the Large Hadron Collider

Dylan P. Gilbert

We estimate the ability of the Large Hadron Collider, the world’s most advanced proton collider, to see fundamental particles that interact most strongly with a peculiar particle called the bottom quark.

 

Observation of Kinetic Processes in Weakly Segregated Diblock Copolymer Films

Mir Henglin

I present an examination the ordering processes of striped diblock copolymer films. It is commonly assumed that all systems which share a common smectic symmetry create order with identical dynamics. Past research performed on strongly segregated diblocks has attempted to characterize such behavior and examine the different ordering processes of such copolymer films.

Measurement of the 7S1/2 Hyperfine Splitting and Isotope Shift in 205Tl and 203Tl

David A. Kealhofer

We report a preliminary measurement of the 205Tl 7P1/2 hyperfine splitting using a twostep excitation in a hot atomic vapor. We find a significant (20 MHz) discrepancy from a previous published value for this splitting. This result is proof that in the main the experimental apparatus works as expected and measurements of the 203Tl 7P1/2 hyperfine

splitting and isotope shift should follow soon. Two laser beams, 378 nm and 1301 nm, are overlapped in a heated vapor cell containing both isotopes of thallium . The 378 nm laser frequency is locked with a controlled feedback loop, and can excite 203Tl, 205Tl, or both isotopes into the intermediate 7S1/2 state. The 1301 nm laser frequency is swept across the 7P1/2 hyperfine levels, and this Doppler-free spectrum is detected with a photodiode and lock-in amplifier.We calibrate the frequency scale with a 500 MHz Fabry-Pérot interferometer and a pair of electro-optic modulators.

 

Entanglement and Bosonic Character of Pairs of Distinguishable Fermions

Christina P. Knapp

All elementary particles can be characterized as bosons or fermions.  I use theoretical physics to investigate when two fermions act like a boson.  In particular, I look at the connection between bosonic behavior and the quantum mechanical property of entanglement.

 

Observation and Modeling of Solar Coronal Structures Using High-Resolution Eclipse Images and Space-based Telescopes with Wide Field of View

Muzhou Lu

In part one, information regarding solar coronal structures and dynamics is extracted from modernized ground-based eclipse observations using high-resolution imaging techniques and computerized processing methods while enhanced space-based observations are used to create a multi-channel view of the corona. In part two, potential magnetic field models are constructed and compared with our observations.

Exploring a Theory of Dark Matter

Alice A. Sady

This thesis studies a particular theoretical framework for dark matter that adds three new particles to the Standard Model of particle physics. We examine how current experimental results constrain the model and how future results could confirm or further constrain the model.

 

A Precise Measurement of the Stark Shift in the Indium 5P1/2 –> 6S1/2 410 nm Transition

Nathan A. Schine

This thesis presents a new high precision measurement of the Stark shift in an indium atomic beam, detailing the unusual measurement method of frequency modulation spectroscopy as well as experimental apparatus and data analysis techniques. This measurement results in a value for the polarizability difference between the 6S1/2 and 5P1/2 states of indium and furthermore provides a model-dependent measurement of the lifetimes of the 6P1/2 and 6P3/2 states.

 

Entangled State Synthesis and Control of Resonators

Roshan Sharma

We investigate and study the optimality of algorithms to generate quantum states in a single resonator coupled to a qubit and two resonators coupled via a qubit.

 

Quantum Fourier Transform and Quantum Schur Transform with Qudits

Qiao Zhang

The thesis explores the potential advantages of implementing quantum algorithms using qudits (quantum digits) over qubits (quantum bits).