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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-chung-you-gilbert-shih
SUMMARY:IQC Student Seminar Featuring Chung-You (Gilbert) Shih
CLASS:PUBLIC
DESCRIPTION:Summary \n\nPROGRAMMABLE INDIVIDUAL OPTICAL ADDRESSING FOR TRAP
 PED-ION QUANTUM\nINFORMATION PROCESSORS \n\nTrapped ions are among the mos
 t advanced platforms for quantum\ncomputation and simulation. Programmable
 \, arbitrary\, and precise\ncontrol—usually through laser-induced light-
 matter interaction—is\nrequired to tune ion-ion interactions. These inte
 ractions translate\ninto diverse parameters of the system under study. Cur
 rent\ntechnologies grapple with scalability issues in large ion chains and
 \nwith \"crosstalk\" due to micron-level inter-ion separation. \n\nIn this
  talk\, we present our development of two optical addressing\nsystems opti
 mized for non-coherent and coherent quantum controls\,\nrespectively. \n\n
 The first addressing system employs a reprogrammable hologram to\nmodulate
  the wavefront of the addressing beam\, thereby engineering the\namplitude
  and phase profile of light across the ion chain. Our\nimplementation comp
 ensates for optical aberrations in the system down\nto λ/20 RMS and exhib
 its less than 10−4 intensity cross-talk error.\nThis results in more tha
 n 99.9% fidelity when resetting the state or\n99.66% when reading out the 
 state of an individual ion without\ninfluencing adjacent ions. This scheme
  can be readily extended to over\na hundred ions and adapted to other plat
 forms\, such as neutral atom\narrays. \n\nAdditionally\, we introduce anot
 her addressing design\, tailored for\ncoherent quantum operations through 
 Raman transitions. This design\nuses a mirrored acoustic-optical deflector
  (AOD) setup to optimize\noptical power scaling and sidestep the undesired
  site-dependent\nfrequency shift commonly observed in AOD-based setups. \n
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DTSTAMP:20250516T224833Z
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