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X-WR-CALDESC:Events for Quantum Initiative
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UID:10000452-1743775200-1743778800@quantum.ncsu.edu
SUMMARY:Effective Theory for Strongly Attractive One-Dimensional Fermions
DESCRIPTION:Abstract\nI discuss how to effectively describe a one-dimensional system of two-component fermions in the regime of strong attractive particle-particle interactions. First\, we examine scattering in the corresponding few-body problem\, which can be solved analytically using the Bethe ansatz. This approach enables us to engineer effective interactions between the system’s relevant degrees of freedom: fermions and bosonic dimers (tightly bound pairs of fermions). We argue that\, despite the strength of these interactions\, the resulting effective problem can be mapped onto a weakly interacting one\, thereby facilitating the use of techniques such as perturbation theory. This insight simplifies the study of many-fermion systems under confinement\, which are otherwise beyond the reach of state-of-the-art numerical methods. \nSpeaker Bio\n\n\n\n\n\n\n\n\nTimothy George Backert \nTimothy George Backert received his M.Sc. in Physics from Technische Universität Darmstadt in 2023\, where he also earned his B.Sc. in Physics in 2021. Currently\, he is pursuing a PhD in Physics at Technische Universität Darmstadt under the guidance of Prof. Dr. Hans-Werner Hammer\, focusing on the “Continuum Structure of the Four-Neutron System.” Timothy’s research interests include effective field theories of nuclear structure\, cold quantum gases\, and ab initio methods\, particularly in lower-dimensional systems. Prior to his PhD\, Timothy’s research primarily centered on one-dimensional Bose and Fermi gases.
URL:https://quantum.ncsu.edu/event/effective-theory-for-strongly-attractive-one-dimensional-fermions/
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241122T130000
DTEND;TZID=America/New_York:20241122T140000
DTSTAMP:20260504T085008
CREATED:20241108T050315Z
LAST-MODIFIED:20241108T050315Z
UID:10000315-1732280400-1732284000@quantum.ncsu.edu
SUMMARY:Quantum process learning and variational quantum computing
DESCRIPTION:Abstract\nParameterized quantum circuits serve as ansätze for solving variational problems and provide a flexible paradigm for programming near-term quantum computers. Here we discuss three fundamental criteria for this paradigm to be effective: expressibility\, trainability and generalizability. We will introduce these concepts and present recent analytic progress quantifying to what extent these criteria can be achieved. While more generally applicable\, the discussion will be framed around the example of trying to variationally learn an unknown quantum process. We will end with some more open-ended dreaming about the applications of these ideas for experimental quantum physics and quantum compilation. \nSpeaker Bio\n\n\n\n\n\n\n\n\nZoë Holmes  \nZoë Holmes received in 2015 her MPhil degree in Physics and Philosophy from the University of Oxford. In 2016 she obtained her MRes (Master of Research) from the Imperial College London\, where in 2019 she got her PhD in quantum thermodynamics. In 2020 she started as a Postdoctoral Researcher at Los Alamos National Laboratory (USA) working on quantum algorithms and quantum machine learning methods for Noisy Intermediate-Scale Quantum (NISQ) computers. In 2021 she became the Mark Kac Fellow at Los Alamos National Lab. Since August 2022 she is Tenure Track Assistant Professor of Physics at EPFL.
URL:https://quantum.ncsu.edu/event/triangle-quantum-computing-seminar-series-talk-8/
LOCATION:Virtual
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241115T130000
DTEND;TZID=America/New_York:20241115T140000
DTSTAMP:20260504T085008
CREATED:20241113T163800Z
LAST-MODIFIED:20241116T041910Z
UID:10000314-1731675600-1731679200@quantum.ncsu.edu
SUMMARY:How to Make an Ion Trap
DESCRIPTION:Abstract\nAmong the principal challenge facing scalability in ion trap quantum computers is the full integration of optics\, digital electronics\, and through-wafer vias into the trap chip. I will discuss Oxford Ionics’ strategy for developing ion trap quantum computers with 100s-1000s of ions\, then describe some of the methodologies for designing large-scale ion trap electrode structures and waveforms. \nSpeaker Bio\n\n\n\n\n\n\n\n\nCurtis Volin \nDr. Curtis Volin is Principal Ion Trap Designer with Oxford Ionics. Prior to joining Oxford Ionics in 2024\, he co-founded the Quantum Systems Group at the Georgia Tech Research Institute (GTRI) in 2005 and was Chief Scientist for Ion Trap Design at Quantinuum. He holds a B.S. in Applied and Engineering Physics from Cornell and a Ph.D. in Optical Sciences from The University of Arizona. He specializes in design and modeling of ion traps and ion trapping waveforms as well as planning and implementation of optics in experimental quantum systems.
URL:https://quantum.ncsu.edu/event/triangle-quantum-computing-seminar-series-talk-9/
LOCATION:Virtual
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241004T130000
DTEND;TZID=America/New_York:20241004T140000
DTSTAMP:20260504T085008
CREATED:20240927T012835Z
LAST-MODIFIED:20240928T001707Z
UID:10000308-1728046800-1728050400@quantum.ncsu.edu
SUMMARY:Progress and Challenges in Quantum Algorithms for Quantum Chemistry: Hard Lessons from the Field
DESCRIPTION:Abstract\nOne of the standard arguments for building a quantum computer is that we might profitably use the entanglements between qubits to simulate the correlations between electrons and thus solve a myriad of important chemical and material design problems. While this is surely an elegant and effective one-line funding justification\, the devil is very much in the details. This talk will provide an overview of some significant progress made over the last five years in this area by both the field and in a few examples by the team I work with at QC Ware\, and will also discuss some serious challenges that remain for us to achieve practical quantum advantage for quantum chemistry. On the positive side\, some specific topics to be discussed are quantum number preserving gate fabrics that finally provide a clean mapping of electrons to qubits\, quantum symmetry adapted perturbation theory as a desperate riposte to the problem of subtractive cancellation in NISQ algorithms\, and quantum Krylov methods that might provide a compelling alternative to the variational quantum eigensolver. On the negative side\, we will look at the relentless progress of classical quantum chemistry methods for solving the average-case chemical problem\, the obvious difficulty of parameter optimization in variational quantum algorithms\, and the current state of performance of real hardware experiments. The resultant picture is that quantum chemistry remains a highly compelling target for practical quantum advantage\, but that urgent attention is needed to remove some dangerous remaining uncertainties in the field. \nSpeaker Bio\nRob Parrish leads the quantum chemistry technology mission at QC Ware. Rob has spent the bulk of his early career learning how to use many types of hardware to accelerate quantum chemistry codes\, including CPUs\, GPUs\, and even some forays into forthcoming QPUs. He has key interests in getting either more detailed or more complete information out of quantum chemistry codes\, as exemplified by his efforts to robustly decompose interaction energies with “F-SAPT” methodology or to provide complete workflows for experimental observables like spectroscopies and conformer distributions. Rob operates under the strong hypothesis that quantum chemistry is imminently due to provide the same digital transformation to chemistry that computational fluid dynamics did for aeronautical engineering\, and works daily to be a small part of that transformation.
URL:https://quantum.ncsu.edu/event/triangle-quantum-computing-seminar-series-talk-3/
LOCATION:Virtual
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240913T130000
DTEND;TZID=America/New_York:20240913T140000
DTSTAMP:20260504T085008
CREATED:20240829T174726Z
LAST-MODIFIED:20240909T205739Z
UID:10000322-1726232400-1726236000@quantum.ncsu.edu
SUMMARY:Quantum Simulation of Spin-Boson Models with Structure Bath
DESCRIPTION:Abstract\nThe spin-boson model\, involving spins interacting with a bath of quantum harmonic oscillators\, is a widely used representation of open quantum systems that describe many dissipative processes in physical\, chemical and biological systems. Trapped ions present an ideal platform for simulating the quantum dynamics of such models\, by accessing both the high-quality internal qubit states and the motional modes of the ions for spins and bosons\, respectively. We demonstrate a fully programmable method to simulate dissipative dynamics of spin-boson models using a chain of trapped ions\, where the initial temperature and the spectral densities of the boson bath are engineered by controlling the state of the motional modes and their coupling with qubit states. Our method provides a versatile and precise experimental tool for studying open quantum systems. \n  \nSpeaker Bio\nDr. Ke Sun received his B.S. in Physics from Shanghai Jiao Tong University in 2018. He received his PhD in Physics from Duke University in 2024. His thesis was titled “Quantum simulation of electron transfer dynamics using a trapped ion quantum system.”
URL:https://quantum.ncsu.edu/event/triangle-quantum-computing-seminar-series-talk-2/
LOCATION:Virtual
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