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Events on 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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