BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Sasha Geim (Harvard) DTSTART:20260303T210000Z DTEND:20260303T220000Z DTSTAMP:20260423T021030Z UID:MathPic/145 DESCRIPTION:Title: A fault-tolerant neutral-atom architecture for universal quantum computa tion\nby Sasha Geim (Harvard) as part of Mathematical Picture Language Seminar\n\nLecture held in Jefferson 256 and Zoom https://harvard.zoom.us /j/779283357?pwd=MitXVm1pYUlJVzZqT3lwV2pCT1ZUQT09.\n\nAbstract\nQuantum er ror correction enables coherent computation on encoded logical qubits whil e simultaneously removing errors from the underlying physical qubits. Here we utilize reconfigurable arrays of up to 448 neutral atoms to experiment ally explore the key elements of a fault-tolerant quantum processing archi tecture\, including below-threshold correction\, fault-tolerant gate opera tions\, universality\, and physical error removal during deep-circuit comp utation. We first demonstrate performance of 2.14(13)x below-threshold in a four-round characterization circuit on individual surface codes\, levera ging loss detection and machine learning decoding. We further explore the physics of repeated error correction in logical entanglement based on tran sversal gates and lattice surgery and extend to universal logic using tran sversal teleportation with 3D color codes for analog-angle synthesis. Fina lly\, we demonstrate a method for mid-circuit qubit re-use\, increasing th e experimental cycle rate by two orders of magnitude and implementing deep -circuit protocols involving hundreds of logical teleportations while main taining constant internal entropy. These results establish foundations for scalable\, universal error-corrected processing and its practical impleme ntation with neutral atom systems.\n\nPasscode: 657361\n LOCATION:https://researchseminars.org/talk/MathPic/145/ END:VEVENT END:VCALENDAR