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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20231012T100000
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SUMMARY:CM Seminar: Lea Nienhaus – Florida State University: Stressing Halide Perovskites
DESCRIPTION:Lea Nienhaus – Florida State University\nTitle: Stressing Halide Perovskites: Nanoscale Investigation of the Properties of Perovskite Thin Films \nAbstract: Solution-processed perovskite thin films consist of small grains with a size of 20 – 2000 nm connected by grain boundaries. As a result\, there is a vast inhomogeneity in the optical and electronic properties of the different grains/GBs within one film\, which can reduce the achievable energy output. In addition\, facile ion movement under external stimuli (light or electric fields) adds additional complexity to the system. However\, solvents can also be used to change the surface doping\, which can have immense impact on energy or charge transfer at the perovskite surface. \nTo gain insight into the optoelectronic and structural response of the perovskite thin film to these external stressors present under operating conditions\, we utilize a combination of scanning tunneling microscopy (STM) and optical spectroscopy. Furthermore\, single molecule absorption STM (SMA-STM) can probe the local inhomogeneity of the surface properties of the perovskite thin film under illumination by locally mapping the additional photogenerated tunneling current. To understand whether the local changes are caused by optoelectronic changes under illumination or structural changes\, we utilize synchrotron X-ray STM (SX-STM). Pump-probe wide-angle X-ray scattering indicates the presence of lattice deformations under optical illumination\, highlighting that the photocarriers distort the lattice\, and thus\, can change the underlying density of states as observed by SMA-STM. \nSpeaker bio: Lea Nienhaus obtained her PhD from UIUC in 2015. Following her postdoc at MIT\, she transitioned to FSU in 2018. Her interests are geared towards pushing the boundaries of optical spectroscopy. Outside of lab\, you can find her playing with her cats\, biking\, swimming or cooking. Additionaly\, she enjoys shining UV lights on household objects.
URL:https://qmi.miffanytark.com/event/cm-seminar-lea-nienhaus-florida-state-university-stressing-halide-perovskites/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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DTSTART;TZID=America/Vancouver:20231019T100000
DTEND;TZID=America/Vancouver:20231019T110000
DTSTAMP:20231013T204741Z
CREATED:20231013T204741Z
LAST-MODIFIED:20231013T204741Z
UID:6467-1697709600-1697713200@qmi.miffanytark.com
SUMMARY:CM Seminar: Marcel Franz – Quantum Matter Institute: d-mon: an improved transmon qubit based on a cuprate Josephson junction
DESCRIPTION:Marcel Franz – Quantum Matter Institute\nTitle: d-mon: an improved transmon qubit based on a cuprate Josephson junction \n  \nAbstract: Transmon qubit\, based on a superconducting Josephson junction shunted by a large capacitance\, is the workhorse component powering the majority of intermediate scale quantum computers currently in operation. I this talk I will describe a theoretical proposal for a novel transmon architecture dubbed “d-mon” that uses unconventional oxide superconductors and is designed to overcome one of the key shortcomings of the conventional transmon. The proposed d-mon architecture is based on a c-axis Josephson junction between a d-wave high-Tc cuprate and a conventional s-wave superconductor. Its chief advantage lies in the large and tunable anharmonicity of its energy spectrum that we predict should enable faster and more reliable gate operation. In contrast to some earlier cuprate-based qubit designs d-mon operates in the regime where quasiparticles are fully gapped and can be therefore expected to achieve long coherence times. \nSpeaker Bio: Marcel Franz is a Professor of Physics at The University of British Columbia and a Deputy Scientific Director of The Blusson Quantum Matter Institute. Franz is a leading expert in theories of topological quantum matter\, unconventional superconductivity and strongly correlated electron systems. His group has made a number of significant advances in these fields including the recent prediction of high-temperature topological superconductivity in twisted bilayers of cuprate superconductors. Franz has received numerous awards and recognitions for his contributions including the A.P. Sloan Fellowship (2002)\, Killam Research Fellowship (2007)\, has been elected Fellow of the APS (2014) and The Royal Society of Canada (2022). He obtained his PhD at The University of Rochester in 1994 and worked as a postdoctoral fellow and McMaster and Johns Hopkins universities before joining the faculty of The University of British Columbia in 2000.
URL:https://qmi.miffanytark.com/event/cm-seminar-marcel-franz-quantum-matter-institute-d-mon-an-improved-transmon-qubit-based-on-a-cuprate-josephson-junction/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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DTSTART;TZID=America/Vancouver:20231026T100000
DTEND;TZID=America/Vancouver:20231026T110000
DTSTAMP:20231006T211631Z
CREATED:20231006T211631Z
LAST-MODIFIED:20231006T211631Z
UID:6423-1698314400-1698318000@qmi.miffanytark.com
SUMMARY:CM Seminar: Lindsay LeBlanc – University of Alberta: Light-matter interactions in cold and ultracold neutral atomic gases
DESCRIPTION:Lindsay LeBlanc – University of Alberta\nTitle: Light-matter interactions in cold and ultracold neutral atomic gases: Applications to quantum memory and holonomic quantum operations \nAbstract: Neutral atomic gases provide fantastic opportunities for studying and controlling quantum phenomena\, ranging from many-body physics to quantum computers. In our research\, we use the well-known interactions between cold gases and electromagnetic radiation to harness various quantum degrees of freedom. Quantum memories\, used for storing and manipulating photonic signals\, will be a key component in quantum communications systems\, especially in realizing critical quantum repeater infrastructure. Cold atoms have significant potential as high performance spin-wave quantum memories\, due to the long storage times associated with low temperature and slow thermal diffusion. In our work\, we demonstrate two memory protocols in ultracold (sometimes Bose-condensed) atoms\, which hold the potential for high-performance light storage: the Autler-Townes splitting (ATS) and superradiant approaches. These methods provide a path towards practical implementations in both ground- and satellite-based quantum communications systems\, and we are working on both increasing performance and developing practical implementations. In a separate direction\, our lab also uses ultracold ensembles to study unconventional quantum gates for quantum computing. In our work on holonomic operations\, we engineer degeneracies into our system through Floquet driving\, with the goal of realizing non-Abelian geometric phases. Our experiments reveal that we indeed rotate quantum states in this degenerate manifold\, though we find that the naive expectation of geometric robustness to fluctuations is less resilient to real experimental issues than expected. We fully characterize our system in terms of its performance in realistic conditions and propose a path forward for working with holonomic operations on a variety of quantum platforms. \nSpeaker bio: Lindsay LeBlanc is an experimental atomic physicist working with ultracold atoms and quantum technologies. Lindsay earned her BSc in Engineering Physics from the University of Alberta in 2003 and her Ph.D. in Physics from the University of Toronto in 2011\, after which she joined the Joint Quantum Institute in Maryland in 2013 as a postdoctoral fellow\, before returning to join the University of Alberta where she is Canada Research Chair in Ultracold Quantum Gases and Associate Professor in Physics.
URL:https://qmi.miffanytark.com/event/cm-seminar-lindsay-leblanc-university-of-alberta-light-matter-interactions-in-cold-and-ultracold-neutral-atomic-gases/
CATEGORIES:CM Seminar
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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