February 2024 - Qse-grad-students

[Queer Physics Collective X PRIMUS] Boba and Crafts Social THURS

by Rain Wang

Hi yall! I hope you're having an amazing Tuesday! This *Thursday at 4:30pm *(till 6ish) we will have a *Boba and Crafts Social* in the *undergrad physics lounge (open to undergrads and grad students!!)*. Feel free to swing by as long or as little as you want. We will have bracelet-making supplies, origami paper, some painting supplies, etc., and, of course, bubble tea. Please fill out this form <https://forms.gle/1t8gLGnfqWKwVUCT7> if you can come :)! See you all soon! [image: snoopy-valentines-day.gif] Best, QPC X PRIMUS _ Rain (Kimberly) Wang *(they/them/theirs)* Bachelor's Candidate in Physics Harvard College | Class of 2025

2 months, 1 week

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Quantum Information Seminar TODAY in NORTHWEST BUILDING B103 - Prof. Henry Yuen

by Cotler, Jordan Saul

Dear all, We are excited to have Prof. Henry Yuen (Columbia University) as our Quantum Information Seminar speaker TODAY from 4:30-5:30 pm in Northwest Building room B103. The details of the talk are as follows: Title: Towards a Complexity Theory for the Quantum Age Abstract: How hard is it to compress a quantum state? To fast-forward the evolution of a local Hamiltonian? To unscramble the Hawking radiation of a black hole? Traditional complexity theory -- which is centered around decision problems and tasks with classical inputs and outputs -- appears inadequate for reasoning about the complexity of such tasks involving quantum inputs and outputs. I'll discuss why we need a "fully quantum" complexity theory, and will describe some facets of such a theory. As a key illustration I'll explain how a "fully quantum" task called the Uhlmann Transformation Problem characterizes the complexity of seemingly unrelated problems, such as decoding noisy quantum channels, performing the Harlow-Hayden black hole radiation decoding task, and breaking the security of quantum bit commitment schemes. I will describe some of the many open problems and directions to explore in the world of fully quantum complexity theory. Bio: Henry Yuen is an Associate Professor of Computer Science at Columbia University. His research focuses on the interplay between quantum computing, complexity theory, cryptography, and information theory. Yuen received a BA in mathematics from the University of Southern California in 2010, and received his PhD in computer science at MIT in 2016. He is a recipient of the NSF CAREER award and a Sloan Fellowship. Sincerely, Jordan Cotler

2 months, 1 week

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FW: Special Seminar - Kaifeng Bu, "Magic: A New Frontier of Quantum Science"

by Ploucha, Clare

Please see the below for a seminar that may be of interest to the HQI community. ________________________________ From: Davis, Jolanta M. <jmdavis(a)fas.harvard.edu> Sent: Wednesday, February 21, 2024 3:39 PM To: physics-faculty(a)lists.fas.harvard.edu <physics-faculty(a)lists.fas.harvard.edu>; Graduate Email Listserve(physics-grads(a)lists.fas.harvard.edu) <physics-grads(a)lists.fas.harvard.edu>; physics-researchers(a)lists.fas.harvard.edu <physics-researchers(a)lists.fas.harvard.edu>; physics-preceptors(a)lists.fas.harvard.edu <physics-preceptors(a)lists.fas.harvard.edu> Subject: Special Seminar - Kaifeng Bu, "Magic: A New Frontier of Quantum Science" Special Seminar Kaifeng Bu "Magic: A New Frontier of Quantum Science" Tuesday, February 27, 1:30pm Jefferson 356 and zoom<https://harvard.zoom.us/j/92173738851?pwd=RTQ0WXVmMWorRlZuVWVYVG1SeWlQQT09> Abstract: Quantum computation is expected to outperform classical computation, yet understanding the origins of this advantage remains a fundamental challenge. In this talk, I will focus on the quantum feature, called magic, which can support the quantum advantage. I will introduce a quantum convolution to test and measure magic. I will also introduce a coarse-graining map, called the “convolution group”, to perform the classification of many-body states. Finally, I will discuss the possible future directions in this framework. Bio: Kaifeng Bu got his B.S. and Ph.D. from Zhejiang University, and is currently a postdoctoral researcher at Harvard University. His research focuses on the advantages of quantum computing and quantum information processing, as well as the interplay of quantum information with physics, computer science, and mathematics.

2 months, 1 week

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FW: LPS Announces the 4th Annual Quantum Computing Summer Short Course

by Ploucha, Clare

Please see below for an opportunity that may be of interest. From: "Pinckney, Kim" <kimpl(a)lps.umd.edu> Date: Monday, February 26, 2024 at 11:58 AM To: "LQC(a)lps.gov" <lqc(a)lps.gov> Cc: "Lundgren, Rex" <rexlundgren(a)lps.umd.edu>, "Mizel, Ari" <ari(a)lps.umd.edu> Subject: LPS Announces the 4th Annual Quantum Computing Summer Short Course Dear Colleague, The Laboratory for Physical Sciences (LPS) Qubit Collaboratory (LQC) is hosting its fourth annual Quantum Computing Summer Short Course from July 8th to July 19th (flyer attached). This virtual 2 week short course provides an introduction to quantum computing to 1st-2nd year graduate students and advanced undergraduates in physics and related fields. We have subject matter experts teaching key topics from algorithms to hardware. Applications<https://forms.gle/WuLmVNsm9uWDXhcYA> are now being accepted! Please share the flyer with anybody who might benefit from the course. Details of Quantum Computing Summer Short Course 2024 * Dates: July 8 – July 19, 2024 * Times: Afternoons 12:30 - 4:30pm EST * Location: Virtual via Zoom * Cost: Free to accepted participants * Deadline to Apply: May 17, 2024 * Application Available: https://forms.gle/WuLmVNsm9uWDXhcYA * Questions?: Contact us at lqc(a)lps.gov<mailto:lqc@lps.gov> Best Regards, Rex Lundgren Ari Mizel LPS Quantum Computing Summer Short Course organizers Kim Pinckney, Ph.D. (she/her) Laboratory for Physical Sciences (LPS) LPS Qubit Collaboratory (LQC) Accelerated Learning Research Thrust | Pathways to Physics (P^3<https://umdphysics.umd.edu/academics/graduate/pathway-to-physics-phd.html>) Liaison NCU Leading Organizations/Udemy Business Support Seeking opportunities in quantum? Visit https://www.qubitcollaboratory.org! This email may contain information that requires protection under the Privacy Act Law. Please handle accordingly.

2 months, 1 week

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Quantum Information Seminar Feb 22 - Kunal Marwaha

by Anshu, Anurag

Dear all, We are excited to have Kunal Marwaha (U Chicago) speak at the next Quantum Information Seminar on Thurs Feb 22, 4:30-5:30 pm in Jefferson 250. Details below. Title: On the promise of quantum advantage for classical optimization Abstract: The holy grail of quantum computing is a practical use for today's machines. A popular suggestion is that quantum computers can approximately solve optimization problems better than classical computers, despite little theoretical evidence. I take this claim seriously, analyzing and comparing average-case algorithms on CSPs of large (but fixed) clause density. It turns out that both algorithms and obstructions from spin glass theory naturally transfer to sparse CSPs, culminating in an optimal algorithm among all bounded-fanout quantum and classical circuits of depth up to ε · log n. This talk surveys several recent works, especially BFMVZ21, JMSS22, and CHM23. With Best Regards, Anurag Anshu

2 months, 2 weeks

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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, 2 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

2 months, 2 weeks

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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

2 months, 3 weeks

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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

2 months, 3 weeks

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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

2 months, 3 weeks

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Qse-grad-students February 2024