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Graduate Program Events

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Events During the Week of July 31st through August 7th, 2022

Monday, August 1st, 2022

No events scheduled

Tuesday, August 2nd, 2022

No events scheduled

Wednesday, August 3rd, 2022

8 week summer session ends
Abstract: *Note: actual end time may vary.* June 20-August 12, 2022
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Thursday, August 4th, 2022

Nanophotonic Systems for Novel Applications: From Spaceflight to Self-Assembled Materials to Thermal Radiation
Time: 1:00 pm
Place: 4274 Chamberlin Hall or
Speaker: Joel Siegel, Physics PhD Graduate Student
Abstract: "The optical properties of a material can be altered by structuring the material with features on the order of the wavelength of interest. This patterning allows for materials to be designed with a targeted optical property, which can be used for any number of potential applications. The focus of this dissertation is a discussion on how the same fundamental principles of light manipulation can be applied to multiple distinct objectives, ranging from interstellar to the nanoscale. In the first section of the dissertation, there will be a discussion on how the microscopic optical forces exerted on a metasurface lightsail propelled by a high-power laser can be engineered via its optical properties to achieve passive self-stabilization, such that the sail is trapped inside the drive beam. In the second section of this dissertation, there will be a discussion on development of a large-scale nanofabrication technique of narrow (< 15 nm) graphene resonators based on block copolymer lithography and how the characteristic scaling laws of resonant graphene plasmons change for these narrow resonators. Additionally, there is a discussion on some potential avenues towards incorporating these into more complex optical designs. In the final section of the dissertation, a method to electronically change the angle of thermal emission from a device based on graphene is discussed."
Host: Victor Brar
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Friday, August 5th, 2022

Improving the performance of quantum computing with neutral atoms
Time: 10:00 am
Place: Chamberlin 4274
Speaker: Xiaoyu Jiang , Physics PhD Graduate Student
Abstract: This thesis reports progress towards implementing quantum computing applications on a 2-dimensional array of neutral atom qubits. While numerous progress has taken place in our lab, here we focus on presenting theoretical analysis on various aspects of the experiment, to help improve the performance of the main experiment.

We finished a thorough analysis on the effect of laser noise on 1- and 2-photon Rabi oscillations, with both theoretical analysis and numerical simulations. We developed a theory to directly match a laser's frequency noise power spectral density to its self-heterodyne spectrum measured in labs. We also predicted the error generated by white noise and spectrums with servo-bumps, and our results have a good match with numerical simulations. A quasi-static theory is also proposed to estimate the error under certain limits, and has demonstrated good match with the numerics.

We design a protocol for multi-qubit neutral atom gates. The protocol implements symmetric adiabatic pulses on the k+1 atoms in the system to implement CkZ gates and CZk gates. Equal Rydberg coupling strengths between all qubits are needed for CkZ gates, and zero coupling between target qubits is needed for CZk gates. We show that fidelity F &gt;0.99 can be achieved for both type of gates, with gate times ~0.5 μs for k&lt;=4. Our analysis is performed with experimentally realistic parameters.
Host: Mark Saffman
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Graduate School Summer 2022: Request for all Master&#39;s and Doctoral Degree Warrants
Time: 4:00 pm
Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu
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