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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-7803
DTSTART:20220805T150000Z
DTEND:20220805T170000Z
DTSTAMP:20260414T113315Z
LAST-MODIFIED:20220726T141816Z
LOCATION:Chamberlin 4274 
SUMMARY:Improving the performance of quantum computing with neutral at
 oms\, Thesis Defense\, Xiaoyu Jiang \, Physics PhD Graduate Student
DESCRIPTION: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 o
 n presenting theoretical analysis on various aspects of the experiment
 \, to help improve the performance of the main experiment.<br>
\n<br>

 \nWe finished a thorough analysis on the effect of laser noise on 1- a
 nd 2-photon Rabi oscillations\, with both theoretical analysis and num
 erical 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 nois
 e and spectrums with servo-bumps\, and our results have a good match w
 ith numerical simulations. A quasi-static theory is also proposed to e
 stimate the error under certain limits\, and has demonstrated good mat
 ch with the numerics.<br>
\n<br>
\nWe design a protocol for multi-qubi
 t neutral atom gates. The protocol implements symmetric adiabatic puls
 es 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 C
 kZ gates\, and zero coupling between target qubits is needed for CZk g
 ates. 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 perf
 ormed with experimentally realistic parameters.
URL:https://www.physics.wisc.edu/events/?id=7803
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