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DTSTART;TZID=America/Toronto:20230913T120000
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-chung-you-gilbert-shih
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 1201 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:IQC Student Seminar Featuring Chung-You (Gilbert) Shih
CLASS:PUBLIC
DESCRIPTION:PROGRAMMABLE INDIVIDUAL OPTICAL ADDRESSING FOR TRAPPED-ION QUAN
 TUM\nINFORMATION PROCESSORS \n\nTrapped ions are among the most advanced p
 latforms for quantum\ncomputation and simulation. Programmable\, arbitrary
 \, and precise\ncontrol—usually through laser-induced light-matter inter
 action—is\nrequired to tune ion-ion interactions. These interactions tra
 nslate\ninto diverse parameters of the system under study. Current\ntechno
 logies grapple with scalability issues in large ion chains and\nwith \"cro
 sstalk\" due to micron-level inter-ion separation. \n\nIn this talk\, we p
 resent our development of two optical addressing\nsystems optimized for no
 n-coherent and coherent quantum controls\,\nrespectively. \n\nThe first ad
 dressing system employs a reprogrammable hologram to\nmodulate the wavefro
 nt of the addressing beam\, thereby engineering the\namplitude and phase p
 rofile of light across the ion chain. Our\nimplementation compensates for 
 optical aberrations in the system down\nto λ/20 RMS and exhibits less tha
 n 10−4 intensity cross-talk error.\nThis results in more than 99.9% fide
 lity when resetting the state or\n99.66% when reading out the state of an 
 individual ion without\ninfluencing adjacent ions. This scheme can be read
 ily extended to over\na hundred ions and adapted to other platforms\, such
  as neutral atom\narrays. \n\nAdditionally\, we introduce another addressi
 ng design\, tailored for\ncoherent quantum operations through Raman transi
 tions. This design\nuses a mirrored acoustic-optical deflector (AOD) setup
  to optimize\noptical power scaling and sidestep the undesired site-depend
 ent\nfrequency shift commonly observed in AOD-based setups. \n\nADD EVENT 
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DTSTAMP:20260406T221450Z
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