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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
X-ORIGINAL-URL:https://qmi.miffanytark.com
X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20240514T130000
DTEND;TZID=America/Vancouver:20240514T140000
DTSTAMP:20240430T172048Z
CREATED:20240430T172048Z
LAST-MODIFIED:20240430T172048Z
UID:7413-1715691600-1715695200@qmi.miffanytark.com
SUMMARY:Special CM Seminar: Étienne Lantagne-Hurtubise – Caltech: Graphene multilayers: from unconventional superconductors to quantum devices
DESCRIPTION:Étienne Lantagne-Hurtubise – Caltech\nTitle: Graphene multilayers: from unconventional superconductors to quantum devices \nAbstract: Crystalline graphene multilayers present a rich playground to explore correlated electronic phenomena in a tunable and ultra-clean setting. For instance\, Bernal bilayer graphene and rhombohedral trilayer graphene host multiple symmetry-broken metallic phases at low temperature\, as well as unconventional superconductors with different pairing symmetries. The rich phase diagram of these systems can further be tuned through proximity to WSe2\, which induces spin-orbit coupling in the graphene layers and leads to a dramatic enhancement of superconductivity that remains poorly understood. I will first discuss the lessons learned from our theoretical exploration of graphene multilayers with induced spin-orbit coupling\, focusing on various types of magnetic and inter-valley coherent ground states and their possible connections to superconductivity. I will then outline a recipe to engineer topological superconductivity in graphene multilayers using gate-defined Josephson junctions. Such a platform provides a promising alternative to traditional architectures for Majorana zero-modes due to its purity\, gate tunability and atomically thin nature.\nSpeaker Bio: Étienne Lantagne-Hurtubise completed his PhD at UBC\, and worked at QMI with Professor Marcel Franz. He is currently a postdoctoral fellow at Caltech.
URL:https://qmi.miffanytark.com/event/special-cm-seminar-etienne-lantagne-hurtubise-caltech-graphene-multilayers-from-unconventional-superconductors-to-quantum-devices/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240530T100000
DTEND;TZID=America/Vancouver:20240530T110000
DTSTAMP:20240514T160912Z
CREATED:20240514T160912Z
LAST-MODIFIED:20240514T160912Z
UID:7454-1717063200-1717066800@qmi.miffanytark.com
SUMMARY:Ultrafast quantum simulation and quantum computing with ultracold atom arrays at quantum speed limit
DESCRIPTION:Abstract: Many-body correlations drive a variety of important quantum phenomena and quantum machines including superconductivity and magnetism in condensed matter as well as quantum computers. Understanding and controlling quantum many-body correlations is thus one of the central goals of modern science and technology. My research group has recently pioneered a novel pathway towards this goal with nearby ultracold atoms excited with an ultrashort laser pulse to a Rydberg state far beyond the Rydberg blockade regime [1-7]. We first applied our  ultrafast coherent control with attosecond precision [2\,3] to a random ensemble 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 arbitrary atom arrays assembled with optical lattices or optical tweezers that develop into a pathbreaking platform for quantum simulation and quantum computing on an ultrafast timescale [4-7]. \nIn this ultrafast quantum computing\, as schematically shown in Fig. 1\, we have recently succeeded in executing a controlled-Z gate\, a conditional two-qubit gate essential for quantum computing\, in only 6.5 nanoseconds at quantum speed limit\, where the gate speed is solely determined by the interaction strength between two qubits [5]. This is faster than any other two-qubit gates with cold-atom hardware by two orders of magnitude. It is also two orders of magnitude faster than the noise from the external environment and operating lasers\, whose timescale is in general 1 microsecond or slower\, and thus can be safely isolated from the noise. Moreover\, this two-qubit gate is faster than the fast two-qubit gate demonstrated recently by “Google AI Quantum” with superconducting qubits [8]. \nFigure 1. Conceptual diagram of the ultrafast twoqubit gate for quantum computing with cold atoms. Two single atoms captured in optical tweezers (red light) with a separation of a micrometer are entangled with an ultrafast laser pulse (blue light) shone for only 10 picoseconds [5]. Image source: Dr. Takafumi Tomita (IMS).\nReferences\n[1] N. Takei et al.\, Nature Commun. 7\, 13449 (2016).\nHighlighted by Science 354\, 1388 (2016); IOP PhyscisWorld.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 (2018).\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 (2023).\n[7] V. Bharti et al.\, arXiv:2311.15575 (2023).\n[8] B. Foxen et al.\, Phys. Rev. Lett. 125\, 120504 (2020). \nSpeaker Bio: Kenji Ohmori is a Chair Professor at the Institute for Molecular Science (IMS)\, National Institutes of Natural Sciences\, Japan. After receiving his Ph.D. from The University of Tokyo in 1992\, he was a Research Associate and an Associate Professor at Tohoku University. In 2003 he was appointed a Full Professor at IMS. \nProfessor Ohmori is currently leading large-scale / long-term national projects on the development of ultrafast quantum simulators and quantum computers (2018-2030) generously supported with priority by the Ministry of Education\, Culture\, Sports\, Science and Technology (MEXT) and Cabinet Office of the government of Japan\, expected as one of the front runners in quantum technologies. \nHe has been celebrated with many honors. Highlights include the Japan Academy Medal (2007)\, Fellow of the American Physical Society (2009)\, Humboldt Research Award from the government of Germany (2012)\, Commendation for Science and Technology by the Minister of MEXT (2018)\, and the Medal with Purple Ribbon by His Majesty the Emperor of Japan for his achievements on quantum physics (2021). The Medal with Purple Ribbon is awarded for inventions and discoveries in science and technology\, and for outstanding achievements in the fields of science\, sports\, art and culture. \nProfessor Ohmori is currently serving as the Chair of the Committee for Quantum Science and Technology Policy\, MEXT\, Japan since 2023\, after serving as the Vice Chair of the same committee from 2015-2022. \nIt was officially announced in February 2024 that Professor Ohmori and his team established the “Commercialization Preparatory Platform” for their “cold (neutral) atom” quantum computer where 13 topnotch industries have joined\, including Development Bank of Japan Inc.\, Hitachi\, Ltd.\, Fujitsu Limited\, NEC Corporation\, and Hamamatsu Photonics K.K. The relevant start-up company will be launched within the Japanese Fiscal Year 2024.
URL:https://qmi.miffanytark.com/event/ultrafast-quantum-simulation-and-quantum-computing-with-ultracold-atom-arrays-at-quantum-speed-limit/
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DTSTART;TZID=America/Vancouver:20240531T100000
DTEND;TZID=America/Vancouver:20240531T110000
DTSTAMP:20240524T231634Z
CREATED:20240524T231634Z
LAST-MODIFIED:20240524T231634Z
UID:7544-1717149600-1717153200@qmi.miffanytark.com
SUMMARY:Special Seminar: Owen Sheekey - UCSB: Inter-valley coherence\, intrinsic and extrinsic spin-orbit coupling in rhombohedral graphene
DESCRIPTION:Abstract: Rhombohedral graphene multilayers provide a clean and highly reproducible platform to explore the emergence of superconductivity and magnetism in a strongly interacting electron system. The high density of states near the van Hove singularities lead to a variety of broken symmetry phases – including exotic forms of spin and valley ferromagnetism [2\, 3]. Because of their combined spin and valley ‘isospin’ degrees of freedom\, these Stoner magnets exhibit an approximate SU(4) symmetry with a near degeneracy in the many body phase diagram. In reality\, this SU(4) symmetry is only approximate\, weak symmetry breaking arises even at the single particle level – in the form of intrinsic spin-orbit coupling. Here\, we use high resolution thermodynamic compressibility measurements and nanoSQUID on tip (nSOT) magnetometry to study the effects that intrinsic spin-orbit coupling has on the magnetic phase diagram in rhombohedral graphene. By supporting rhombohedral graphene on a WSe2 substrate\, ‘extrinsic’ strong spin-orbit coupling can be proximitized\, significantly altering the magnetic phase diagram. We demonstrate the presence of an inter-valley coherent quarter metal which becomes strongly spin-valley locked when supported by WSe2. Our results shed light on the role proximity induced Ising spin-orbit coupling and intrinsic spin-orbit coupling plays in selecting the ground state in correlated graphene systems. \nReferences: \n[1] Zhou\, H.\, Xie\, T.\, Taniguchi\, T. et al. Nature 598\, 434–438 (2021). \n[2] Zhou\, H.\, Xie\, T.\, Ghazaryan\, A.\, et al. Nature 598\, 429–433 (2021). \n[3] Arp\, T.\, et. al. arXiv:2310.03781 (2023).
URL:https://qmi.miffanytark.com/event/special-seminar-owen-sheekey-ucsb-inter-valley-coherence-intrinsic-and-extrinsic-spin-orbit-coupling-in-rhombohedral-graphene/
LOCATION:McLeod 3038\, 2356 Main Mall\, Vancouver\, British Columbia\, V6T 1Z3\, Canada
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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