BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Drupal iCal API//EN X-WR-CALNAME:Events items teaser BEGIN:VEVENT UID:6483441ca3393 DTSTART;TZID=America/Toronto:20230531T120000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20230531T130000 SUMMARY:IQC Student Seminar featuring Sainath Motlakunta CLASS:PUBLIC DESCRIPTION:Summary \n\nPRESERVING A QUBIT DURING ADJACENT MEASUREMENTS AT A FEW MICROMETERS\nDISTANCE  \n\nAbstract:\n\nProtecting a quantum objec t against irreversible accidental\nmeasurements from its surroundings is n ecessary for controlled quantum\noperations. This becomes especially chal lenging or unfeasible if one\nmust simultaneously measure or reset a nearb y object's quantum state\,\nsuch as in quantum error correction. \n\nIn a tomic systems - among the most established quantum information\nprocessing platforms - current attempts to preserve qubits against\nresonant laser-d riven adjacent measurements\, waste valuable\nexperimental resources such as coherence time or extra qubits and\nintroduce additional errors. We p reserve the quantum state of an\n'asset' ion qubit with high fidelity\, wh ile a neighbouring qubit at a\nfew microns distance is reset/measured. We achieve < 1 x\n10-3 probability of accidental measurement of the asset qu bit during\na neighbouring qubit reset and < 4 x 10-3 while applying a de tection\nbeam on the same neighbour\, for 11 μs\, at a distance of 6 μ m or 4\ntimes the addressing Gaussian beam waist (permitted by the numeric al\naperture).\n\nThese low probabilities correspond to the preservation o f the quantum\nstate of the qubit with fidelities above 99.90% (state-rese t) and\n99.6% (state-measurement). Our results are enabled by precise\nwa vefront control of the addressing optical beams\, while utilizing a\nsin gle ion as a quantum sensor of optical aberrations.\n\nOur work demonstra tes the feasibility of in-situ state-reset and\nmeasurement operations\, building towards enhancements in the speed and\ncapabilities of quantum pr ocessors such as in simulating\nmeasurement-driven quantum phases and real izing quantum error\ncorrection.\n DTSTAMP:20230609T152412Z END:VEVENT END:VCALENDAR