BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:5 UID:UW-Physics-Event-8801 DTSTART:20240716T210000Z DTEND:20240716T220000Z DTSTAMP:20260413T184625Z LAST-MODIFIED:20240716T144946Z LOCATION:5310 Chamberlin Hall SUMMARY:Ultrafast quantum simulation and quantum computing with ultrac old atom arrays at quantum speed limit\, R. G. Herb Condensed Matter S eminar\, Kenji Ohmori\, Institute for Molecular Science (IMS)\, Nation al Institutes of Natural Sciences\, Japan DESCRIPTION:Many-body correlations drive a variety of important quantu m phenomena and quantum machines including superconductivity and magne tism in condensed matter as well as quantum computers. Understanding a nd controlling quantum many-body correlations is thus one of the centr al goals of modern science and technology. My research group has recen tly pioneered a novel pathway towards this goal with nearby ultracold atoms excited with an ultrashort laser pulse to a Rydberg state far be yond the Rydberg blockade regime [1-7]. We first applied our ultrafast coherent control with attosecond precision [2\,3] to a random ensembl e of those Rydberg atoms in an optical dipole trap\, and successfully observed and controlled their strongly correlated electron dynamics on a sub-nanosecond timescale [1]. This new approach is now applied to a rbitrary atom arrays assembled with optical lattices or optical tweeze rs that develop into a pathbreaking platform for quantum simulation an d quantum computing on an ultrafast timescale [4-7]. In this ultrafast quantum computing\, as schematically shown in Fig. 1\, we have recent ly succeeded in executing a controlled-Z gate\, a conditional two-qubi t gate essential for quantum computing\, in only 6.5 nanoseconds at qu antum speed limit\, where the gate speed is solely determined by the i nteraction strength between two qubits [5]. This is\, faster than any other two-qubit gates with cold-atom hardware by two orders of magnitu de. It is also two orders of magnitude faster than the noise from the external environment and operating lasers\, whose timescale is in gene ral 1 microsecond or slower\, and thus can be safely isolated from the noise. Moreover\, this two-qubit gate is faster than the fast two-qub it gate demonstrated recently by “Google AI Quantum” with supercon ducting qubits [8]. \nReferences \n[1] N. Takei et al.\, Nature Commun . 7\, 13449 (2016). \nHighlighted by Science 354\, 1388 (2016)\; IOP P hyscisWorld.com (2016). \n[2] H. Katsuki et al.\, Acc. Chem. Res. 51\, 1174 (2018). \n[3] C. Liu et al.\, Phys. Rev. Lett. 121\, 173201 (201 8). \n[4] M. Mizoguchi et al.\, Phys. Rev. Lett. 124\, 253201 (2020). \n[5] Y. Chew et al.\, Nature Photonics 16\, 724 (2022). (Front Cover Highlight) \n[6] V. Bharti et al.\, Phys. Rev. Lett. 131\, 123201 (202 3). \n[7] V. Bharti et al.\, arXiv:2311.15575 (2023). \n[8] B. Foxen e t al.\, Phys. Rev. Lett. 125\, 120504 (2020). URL:https://www.physics.wisc.edu/events/?id=8801 END:VEVENT END:VCALENDAR