- Qse-grad-students

HQI undergraduate summer research fellowship announcement

by Gallagher, Claire M.

The Harvard Quantum Initiative (HQI) is inviting applications for undergraduate summer research fellows. This competitive program will select around 10 undergraduate researchers performing research in quantum science and engineering, encompassing theory, materials, devices, and systems research. Please see the attached flyer for more information. Sincerely, Claire M. Gallagher Staff Assistant III Harvard Quantum Initiative 33 Oxford Street, MD 351 Cambridge, MA 02138 P. (617) 496-2361

2 months, 4 weeks

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[QMatter in Math/Physics Feb 16, Fri 10:30 - 12 ET] Susanne Yelin (Harvarc) Programmable Simulations of Molecules and Materials with present-day Reconfigurable Quantum Processors - Harvard CMSA G10

by Juven Wang

Reminder: Tomorrow on Friday. https://cmsa.fas.harvard.edu/events-archive/category/quantum-matter-seminar/ ----- Time: Friday 10:30 - 12 am ET, Feb 16 Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa ————————————————————————————————— Warmly welcome Prof. Susanne Yelin! Susanne Yelin (Harvard) Programmable Simulations of Molecules and Materials with present-day Reconfigurable Quantum Processors Simulations of quantum chemistry and quantum materials are believed to be among the most important potential applications of quantum information processors, but realizing practical quantum advantage for such problems is challenging. We introduce a simulation framework for strongly correlated quantum systems that can be represented by model spin Hamiltonians. Our approach leverages reconfigurable qubit architectures to programmably simulate real-time dynamics and introduces an algorithm for extracting chemically relevant spectral properties via classical co-processing of quantum measurement results. We develop a digital-analog simulation toolbox for efficient Hamiltonian time evolution utilizing digital Floquet engineering and hardware-optimized multi-qubit operations to accurately realize complex spin-spin interactions, and as an example present an implementation proposal based on Rydberg atom arrays. Then, we show how detailed spectral and other relevant chemical information can be extracted from these dynamics through snapshot measurements and single-ancilla control, enabling the evaluation of excitation energies and finite-temperature susceptibilities from a single-dataset. To illustrate the approach, we show how this method can be used to compute key properties of a polynuclear transition-metal catalyst and 2D magnetic materials. -------- Subscribe to Harvard CMSA Quantum Matter and other seminar videos (more to be uploaded): https://www.youtube.com/playlist?list=PL0NRmB0fnLJQAnYwkpt9PN2PBKx4rvdup Subscribe to Harvard CMSA seminar mailing list: https://forms.gle/1ewa7KeP6BxBuBeRA --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

3 months

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Wednesday, Feb. 14. Quantum Colloquium. Prof. Heinrich

by Gallagher, Claire M.

HQI Colloquium - Prof. Andreas Heinrich Wednesday, February 14, 2024 Jefferson 250 Andreas Heinrich, IBS Center for Quantum Nanoscience, Ewha Womans University Title: "Towards Quantum Computing with Spins on Surfaces" There is a strong international research effort in the area of quantum information science. Here, the concepts of quantum coherence, superposition and entanglement of quantum states are exploited. These concepts were originally shown with photons as well as atoms and ions in vacuum traps. Over the past two decades, many advances at studying such quantum coherence in solid-state and molecular architectures have evolved [1]. In this talk we will focus on quantum-coherent experiments in Scanning Tunneling Microscopy (STM). STM enables the study of surfaces with atomic-scale spatial resolution and offers the ability to study individual atoms and molecules on surfaces. Here at Ewha, we have one of the world's best facilities for such studies. STM can also be used to move atoms with atomic-scale precision, which enables us to build engineered nanostructures where each atom is in the exactly correct place. In order to study qubits with STM, we recently learned how to combine STM with electron spin resonance [2,3]. Spin resonance gives us the means to quantum-coherently control an individual atomic or molecular spin on a surface. Using short pulses of microwave radiation further enables us to perform qubit rotations and learn about the quantum coherence times of our spins [4]. Finally, we will finish with recently published results on multi-qubit operations with spins on surfaces. Mengke Liu, Hoffman Group Title: "Visualizing momentum-dependent Kondo coupling in a correlated van der Waals heavy fermion system" In systems containing f-orbitals, the exchange interaction between localized f-electron moments and itinerant electrons, known as Kondo coupling, is the key concept in understanding the complex phase diagrams of heavy fermions. In a newly discovered 2D van der Waals system, UOTe, we employed scanning tunneling microscopy/spectroscopy and quasi-particle interference to directly visualize this Kondo coupling behavior. This includes the observation of flat bands originating from the 5f electrons and an avoided crossing between these flat bands and the conduction bands. Additionally, we identified distinct avoided crossing behaviors along the Gamma-M and Gamma-X/Y directions. This study establishes UOTe as a unique system for investigating momentum-dependent Kondo interactions. Student presentation by Mengke Liu at 4:00 PM Coffee break from 4:10-4:30 PM Guest Presentation will begin at 4:30 PM Claire M. Gallagher Staff Assistant III Harvard Quantum Initiative 33 Oxford Street, MD 351 Cambridge, MA 02138 P. (617) 496-2361

3 months

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[QMatter Math/Phys Feb 13, Wed 4 - 5:30 pm] Sen Hu (SIMIS) - Quantum Algebra of Chern-Simons Matrix Model and Large N Limit - Harvard CMSA G10

by Juven Wang

Warmly welcome Prof. Sen Hu! https://cmsa.fas.harvard.edu/event_category/quantum-matter-seminar/ ----- Time: Wed 4 pm - 5:30 pm ET, Feb 14 Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa ————————————————————————————————— Sen Hu (Shanghai Institute for Mathematics and Interdisciplinary Study) Title: Quantum Algebra of Chern-Simons Matrix Model and Large N Limit Abstract: In this talk we discuss the algebra of quantum observables of the Chern-Simons matrix model which was originally proposed by Susskind and Polychronakos to describe electrons in fractional quantum Hall effects. We establish the commutation relations for its generators and study the large N limit of its representation. We show that the large N limit algebra is isomorphic to the uniform in N algebra studied by Costello, which is conjecturally isomorphic to the deformed double current algebra studied by Guay. Under appropriate scaling limit, we show that the large N limit algebra degenerates to a Lie algebra which admits a surjective map to the affine Lie algebra of u(p). This leads to a complete proof of the large N emergence of the u(p) current algebra as proposed by Dorey, Tong and Turner. This also suggests a rigorous derivation of edge excitation of a fractional quantum Hall droplet. This is a joint work with Si Li, Dongheng Ye and Yehao Zhou (arXiv: 2308.14046). --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

3 months

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[QMatter Math/Phys Feb 16, Fri 10:30 - 12 ET] Susanne Yelin (Harvarc) Programmable Simulations of Molecules and Materials with present-day Reconfigurable Quantum Processors - Harvard CMSA G10

by Juven Wang

Warmly welcome Prof. Susanne Yelin! https://cmsa.fas.harvard.edu/event_category/quantum-matter-seminar/ ----- Time: Friday 10:30 - 12 am ET, Feb 16 Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa ————————————————————————————————— Susanne Yelin (Harvard) Title: Programmable Simulations of Molecules and Materials with present-day Reconfigurable Quantum Processors Abstract: Simulations of quantum chemistry and quantum materials are believed to be among the most important potential applications of quantum information processors, but realizing practical quantum advantage for such problems is challenging. We introduce a simulation framework for strongly correlated quantum systems that can be represented by model spin Hamiltonians. Our approach leverages reconfigurable qubit architectures to programmably simulate real-time dynamics and introduces an algorithm for extracting chemically relevant spectral properties via classical co-processing of quantum measurement results. We develop a digital-analog simulation toolbox for efficient Hamiltonian time evolution utilizing digital Floquet engineering and hardware-optimized multi-qubit operations to accurately realize complex spin-spin interactions, and as an example present an implementation proposal based on Rydberg atom arrays. Then, we show how detailed spectral and other relevant chemical information can be extracted from these dynamics through snapshot measurements and single-ancilla control, enabling the evaluation of excitation energies and finite-temperature susceptibilities from a single-dataset. To illustrate the approach, we show how this method can be used to compute key properties of a polynuclear transition-metal catalyst and 2D magnetic materials. --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

3 months

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[QMatter in Math/Physics Feb 9, Fri 9:30 - 11 am ET] Soonwon Choi (MIT) Quantum Algorithms to Recognize Phases of Matter and Exactly Solvable 2D Models with Anomalous Entanglement Entropy - Harvard CMSA G10

by Juven Wang

Quantum Matter in Mathematics and Physics! https://cmsa.fas.harvard.edu/events-archive/category/quantum-matter-seminar/ Let us warmly welcome Prof. Soonwon Choi (MIT). ----- Time: Friday 9:30 - 11 am ET, Feb 9 Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa ————————————————————————————————— *Soonwon Choi (MIT)* Title: Quantum Algorithms to Recognize Phases of Matter and Exactly Solvable 2D Models with Anomalous Entanglement Entropy Abstract: In this talk, I will report my two recent results at the intersection of quantum information and strongly interacting phases of matters. In the first half of the talk, we describe exact quantum algorithms that recognize a class of 1D gapped phases, namely symmetry protected topological phases or spontaneous symmetry breaking phases protected by abelian internal symmetry. The key idea is to observe the conceptual similarity between renormalization group (RG) flow and error correction, and to implement the latter as unitary circuits emulating the RG flow. Our algorithm guarantees faithful recognition of a target phase with a small number of input quantum state samples. In the second half, we present a class of 2D Hamiltonians, where the exact ground state wavefunctions can be exactly evaluated and shown to exhibit anomalous entanglement properties. One class of our models exhibit area-law scaling entanglement entropy, but this is mostly due to non-local correlation: one finds that the topological entanglement entropy also scales with the size of subsystem choices. By making simple modifications, we can also devise 2D models with volume-law scaling bipartite entanglement entropy. Our results can be understood as a generation of the 1D Motzkin model to 2D systems. Based on: Work done with Ethan Lake and Shankar Balasubramanian https://arxiv.org/abs/2211.09803 https://arxiv.org/abs/2305.07028 --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

3 months, 1 week

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[Harvard-quantum-initiative] FW: CQIQC Conference at the Fields, August 2024

by Harvard Quantum Initiative

Please see below for an announcement that may be of interest to the HQI Community. From: Quantum Centre <quantum(a)utoronto.ca> Date: Tuesday, February 6, 2024 at 3:39 PM To: Chemistry Communications <chem.comms(a)utoronto.ca> Subject: CQIQC Conference at the Fields, August 2024 Hello! I am writing in my capacity as Communications Officer for the Center for Quantum Information and Quantum Control (CQIQC) at the University of Toronto, where we and the Fields Institute for Research in Mathematical Sciences are deep into planning the 2024 iteration of the CQIQC conference. Scheduled for August 26-30, this gathering will continue the tradition of highlighting excellence and innovation in quantum research, as well as fostering collaboration within the quantum community worldwide. The full list of speakers is available on the conference website<http://www.fields.utoronto.ca/activities/24-25/CQIQC>. We are reaching out to you in hopes that you will help us spread the word about the upcoming meeting. In addition to the invited speakers, we incorporate a range of contributed talks and posters, many delivered by junior scientists, PDFs and graduate students. The abstract submission for contributed talks and posters<https://survey.alchemer.com/s3/7408116/CQIQC-X-abstract-submission> is now live on our site; conference registration will open in March. NOTE: We have extended the deadline for abstract submissions to February 25th at 11:59 p.m. We would be grateful if you could reach out to your members and students, pointing out the call for abstracts. Thank you for your help, and please let us know if you have any questions. ALYX DELLAMONICA (they/them) Communications Officer CQIQC University of Toronto 80 St George Street, Rm 151 Toronto, Ontario, M5S 3H6 Office: 416-978-1630 chem.comms(a)utoronto.ca<mailto:chem.comms@utoronto.ca> chemistry.utoronto.ca<https://www.chemistry.utoronto.ca/> [2Q==] _______________________________________________ Harvard-quantum-initiative mailing list -- harvard-quantum-initiative(a)lists.fas.harvard.edu To unsubscribe send an email to harvard-quantum-initiative-leave(a)lists.fas.harvard.edu

3 months, 1 week

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[QMatter Math/Phys Feb 6th, Tue 4 - 5:30 pm] Yuta Hamada (KEK) - Flavor hierarchy from smooth confinement & Towards a complete classification of 6d supergravities - Harvard CMSA G10

by Juven Wang

Let us warmly welcome Prof. Yuta Hamada (KEK, Tsukuba) in person (who is also visiting the Swampland Program)! https://cmsa.fas.harvard.edu/series/quantum-matter-in-mathematics-and-physi… ----- Time: Tue 4 pm - 5:30 pm ET, Feb 6 Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa ————————————————————————————————— Yuta Hamada (KEK, Tsukuba) Title: Flavor hierarchy from smooth confinement & Towards a complete classification of 6d supergravities Abstract: The talk consists of two independent parts. In the first part, I will talk about a new model to explain the Standard Model flavor hierarchy. Our model is based on explicit smooth confinement. The smallness of the first- and second-family fermion masses is explained by the exponential hierarchy via dimensional transmutation. In the second part, I will talk about a classification of 6D supergravities. We make progress towards a complete classification of 6D supergravities with minimal supersymmetry and non-abelian gauge group. -------- Subscribe to Harvard CMSA Quantum Matter and other seminar videos (more to be uploaded): https://www.youtube.com/playlist?list=PL0NRmB0fnLJQAnYwkpt9PN2PBKx4rvdup Subscribe to Harvard CMSA seminar mailing list: https://forms.gle/1ewa7KeP6BxBuBeRA --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

3 months, 1 week

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Note about QSE journal club

by Sule, Nishant V.

Dear all, I don’t know about you, but to me it feels like a lot is already happening in this semester. I hope yours is off to a good start! I am writing to suggest a small change to the QSE journal club with the intention of making it easier and better for everyone. In order to increase interactions between all QSE students as well as a stronger community between the cohorts, we think that it would help if the QSE journal club were to be co-led by both the G1 and G2 cohorts. Not only will this help share the organizational burden but will hopefully also initiate more interactions between your cohorts. We leave the organizational details for you all to decide, but some potential options to consider are, say a.) each cohort collectively takes turns in leading the weekly discussion, or b.) two new volunteers (one G1 and one G2) together lead the club each week, or perhaps c.) each cohort (G1 and G2) appoints their club QSE czar who take charge and organize through out the semester. Of course you are welcome to find your own creative solutions. (Notice how I have subtly made the transition from QSE journal club to club QSE :). This is to say that perhaps you may want to think broader and not limit yourselves to discussions of journal papers in these meetings. Maybe you are already going beyond papers… as some of you have heard Evelyn and me mention this in the previous QSE301– as long as these discussions benefit your academic journey in QSE, you should feel free to explore the ideas, topics, themes etc. that you all find engaging. You can also invite individuals in the broader HQI community to interact with you in these settings.) If there are any questions or if any of you would like to chat about this in more detail or anything else on your mind, please don’t hesitate to reach out. Best, Nishant

3 months, 1 week

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[Harvard-quantum-initiative] FW: Reminder: 2024 Dalgarno Memorial Lectures - Prof. Jun Ye (JILA)

by Harvard Quantum Initiative

Please see below for a talk series that may be of interest to the HQI Community From: "Donahue, Jaclyn" <jaclyn.donahue(a)cfa.harvard.edu> Date: Friday, February 2, 2024 at 2:00 PM Subject: Reminder: 2024 Dalgarno Memorial Lectures - Prof. Jun Ye (JILA) Dear Everyone: I am sending a friendly reminder about the 2024 Dalgarno Memorial Lectures given by Prof. Jun Ye (JILA) next week. with regards, Jaclyn Dalgarno Memorial Lectures (https://lweb.cfa.harvard.edu/itamp-lectures/dalgarno-memorial-lectures) 4:30 pm Monday February 5 - Physics Colloquium, Jefferson 250 Celebrating Dalgarno’s Serendipitous Journey – Building atomic clocks for fundamental physics 1:30 pm Tuesday February 6 - Center for Astrophysics Colloquium, Phillips Auditorium Quantum degenerate gas of polar molecules 10:00 am Thursday February 8 - 301 Pierce Hall Molecules under new light -- Jaclyn Donahue Administrative Coordinator The Institute for Theoretical Atomic, Molecular and Optical Physics 60 Garden Street, MS 14 Cambridge MA 02138 617-495-9524 | http://www.cfa.harvard.edu/itamp/ -- You received this message because you are subscribed to the Google Groups "itampannounce" group. To unsubscribe from this group and stop receiving emails from it, send an email to itampannounce+unsubscribe(a)cfa.harvard.edu<mailto:itampannounce+unsubscribe@cfa.harvard.edu>. To view this discussion on the web visit https://groups.google.com/a/cfa.harvard.edu/d/msgid/itampannounce/CAKVYK6xJ…<https://groups.google.com/a/cfa.harvard.edu/d/msgid/itampannounce/CAKVYK6xJ…>. For more options, visit https://groups.google.com/a/cfa.harvard.edu/d/optout. _______________________________________________ Harvard-quantum-initiative mailing list -- harvard-quantum-initiative(a)lists.fas.harvard.edu To unsubscribe send an email to harvard-quantum-initiative-leave(a)lists.fas.harvard.edu

3 months, 2 weeks

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Qse-grad-students