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URL:/institute-for-quantum-computing/events/sainath-mot
 lakunta-phd-thesis-defence
SUMMARY:Sainath Motlakunta PhD Thesis Defence
CLASS:PUBLIC
DESCRIPTION:Summary \n\nDEVELOPING A LARGE-SCALE\, PROGRAMMABLE TRAPPED ION
  QUANTUM SIMULATOR\nWITH IN SITU MID-CIRCUIT MEASUREMENT AND RESET\n\nQuan
 tum simulators are a valuable resource for studying complex\nmany-body sys
 tems. With their ability to provide near-term advantages\,\nanalog quantum
  simulators show great promise. During the course of my\nPhD\, my aim was 
 to construct a large-scale trapped-ion based analog\nquantum simulator wit
 h several objectives in mind: controllability\,\nminimal external decohere
 nce\, an expandable toolkit for quantum\nsimulations\, enhanced stability 
 through robust design practices\, and\npushing the boundaries of error cor
 rection.\n\nOne of my key achievements is the demonstration of high-fideli
 ty\npreservation of an “asset” ion qubit while simultaneously\nresetti
 ng or measuring a neighboring “process” qubit located a few\nmicrons a
 way. My results show that I achieve a probability of\naccidental measureme
 nt of the asset qubit below 1×10−3 while\nresetting the process qubit. 
 Similarly\, when applying a detection beam\non the same neighboring qubit 
 to achieve fast detection times\, the\nprobability remains below 4 × 10
 −3 at a distance of 6 μm. These\nlow probabilities correspond to the pr
 eservation of the quantum state\nof the asset qubit with fidelities above 
 99.9% for state reset and\n99.6% for state measurement.\n\nAdditionally\, 
 I successfully conduct a dissipative many-body cooling\nexperiment based o
 n reservoir engineering by leveraging site-selective\nmid-circuit resets. 
 I propose and optimize a protocol utilizing\nreservoir engineering to effi
 ciently cool the spin state of a\nsubsystem coupled to a reservoir with co
 ntrolled dissipation. Through\nanalog quantum simulation of this protocol\
 , I am able to demonstrate\nthe lowering of energy within the subsystem.\n
 \nFurthermore\, I thoroughly discuss the design\, fabrication\, and\nassem
 bly of a large-scale trapped ion quantum simulator called the\nBlade trap 
 as part of my PhD work. I highlight the specific design\nconsiderations ta
 ken to isolate the trapped ions from external\ndisturbances that could int
 roduce errors. Comprehensive testing\nprocedures are presented to evaluate
  the performance and stability of\nthe Blade trap\, which are crucial for 
 assessing the effectiveness of\nthe design. An important milestone I achie
 ve is reaching a base\npressure below 9E-13 mbar\, demonstrating the succe
 ssful implementation\nof techniques to maintain an extremely low-pressure 
 environment ideal\nfor quantum simulation.\n 
DTSTAMP:20250519T224719Z
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