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DTSTART:20230312T070000
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DTSTART:20221106T060000
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DTSTART;TZID=America/Toronto:20230531T120000
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-sainath-motlakunta
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 1201 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:IQC Student Seminar featuring Sainath Motlakunta
CLASS:PUBLIC
DESCRIPTION:PRESERVING A QUBIT DURING ADJACENT MEASUREMENTS AT A FEW MICROM
 ETERS\nDISTANCE  \n\nAbstract:\n\nProtecting a quantum object against ir
 reversible accidental\nmeasurements from its surroundings is necessary for
  controlled quantum\noperations. This becomes especially challenging or u
 nfeasible if one\nmust simultaneously measure or reset a nearby object's q
 uantum state\,\nsuch as in quantum error correction. \n\nIn atomic system
 s - among the most established quantum information\nprocessing platforms -
  current attempts to preserve qubits against\nresonant laser-driven adjace
 nt measurements\, waste valuable\nexperimental resources such as coherence
  time or extra qubits and\nintroduce additional errors. We preserve the 
 quantum state of an\n'asset' ion qubit with high fidelity\, while a neighb
 ouring qubit at a\nfew microns distance is reset/measured. We achieve < 1 
 x\n10-3 probability of accidental measurement of the asset qubit during\n
 a neighbouring qubit reset and < 4 x 10-3 while applying a detection\nbea
 m on the same neighbour\, for 11 μs\, at a distance of 6 μm or 4\ntime
 s the addressing Gaussian beam waist (permitted by the numerical\naperture
 ).\n\nThese low probabilities correspond to the preservation of the quantu
 m\nstate of the qubit with fidelities above 99.90% (state-reset) and\n99.6
 % (state-measurement). Our results are enabled by precise\nwavefront cont
 rol of the addressing optical beams\, while utilizing a\nsingle ion as a
  quantum sensor of optical aberrations.\n\nOur work demonstrates the fea
 sibility of in-situ state-reset and\nmeasurement operations\, building tow
 ards enhancements in the speed and\ncapabilities of quantum processors suc
 h as in simulating\nmeasurement-driven quantum phases and realizing quantu
 m error\ncorrection.
DTSTAMP:20260407T053903Z
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