- Qse-grad-students

Wednesday, 5/8 at 2:00pm: Quantum Colloquium - Garnet Chan

by Ploucha, Clare

Quantum Colloquium – Prof. Garnet Chan Wednesday, May 8, 2:00pm Jefferson 250 Garnet Kin-Lic Chan, Bren Professor of Chemistry, Caltech “Simulating the quantum world on a classical computer” Dirac wrote that the laws that govern ordinary matter were known, but that the resulting equations of quantum many-particle systems were too complicated to be soluble. I will describe how, a century later, the situation has very much changed in the classical simulation of molecules and materials. I will draw on examples from our group’s research in the applied physics domain, namely recent work on the simulation of the ground-states of high-temperature superconductors and the modeling of certain kinds of quantum dynamics. Guest presentation will begin promptly at 2:00 PM

10 hours, 34 minutes

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TODAY at 1pm: Quantum Colloquium - Xie Chen

by Ploucha, Clare

Quantum Colloquium – Prof. Xie Chen Wednesday, May 1, 1:00pm Jefferson 250 Xie Chen, Caltech “Quantum circuit as a lens into quantum phases and phase transitions” Quantum systems host fascinating phases like superconductivity, quantum Hall, topological order, etc. that have no classical counterpart. Understanding what quantum phases exist and how phase transitions happen between them is the ultimate goal of condensed matter. But this is notoriously hard, especially in systems with strong interactions. We find that the Quantum Circuit, a tool in quantum computation, provides surprisingly useful insight into the many-body entanglement structure of quantum wavefunctions and correspondingly the structure of the quantum phase diagram. In this talk, we start by reviewing how a decade ago defining gapped quantum phases using finite-depth quantum circuits led us to the systematic construction and classification of Symmetry Protected Topological Phases. Recently, we made another breakthrough by realizing that the transition between different gapped phases can be achieved with sequential quantum circuits. This opens the door to the systematic study of defects in quantum systems, their condensation, and the induced phase transitions in strongly interacting systems. Guest presentation will begin promptly at 1:00 PM

5 days, 16 hours

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Wednesday, 5/1 at 1pm: Quantum Colloquium - Xie Chen

by Ploucha, Clare

Quantum Colloquium – Prof. Xie Chen Wednesday, May 1, 1:00pm Jefferson 250 Xie Chen, Caltech “Quantum circuit as a lens into quantum phases and phase transitions” Quantum systems host fascinating phases like superconductivity, quantum Hall, topological order, etc. that have no classical counterpart. Understanding what quantum phases exist and how phase transitions happen between them is the ultimate goal of condensed matter. But this is notoriously hard, especially in systems with strong interactions. We find that the Quantum Circuit, a tool in quantum computation, provides surprisingly useful insight into the many-body entanglement structure of quantum wavefunctions and correspondingly the structure of the quantum phase diagram. In this talk, we start by reviewing how a decade ago defining gapped quantum phases using finite-depth quantum circuits led us to the systematic construction and classification of Symmetry Protected Topological Phases. Recently, we made another breakthrough by realizing that the transition between different gapped phases can be achieved with sequential quantum circuits. This opens the door to the systematic study of defects in quantum systems, their condensation, and the induced phase transitions in strongly interacting systems. Guest presentation will begin promptly at 1:00 PM

1 week

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TODAY at 11am: Quantum Colloquium - Eugene Demler

by Ploucha, Clare

Quantum Colloquium – Prof. Eugene Demler Thursday, April 25th, 11:00am 60 Oxford Street, Room 301 Eugene Demler, ETH Zurich Title: Illuminating Electron Correlations Developments in optical technology bring new modalities of probing electron systems. This talk will review several examples of the correlated states revealed by novel optical probes with an emphasis on the theoretical models necessary for interpreting experimental results. We will start by discussing recent experiments in the pseudogap phase of the high Tc cuprates that have been interpreted as the light induced Meissner effect. We will approach this phenomenon from the perspective of nonlinear dynamics of the sine-Gordon model triggered by the strong terahertz pump pulse. This interpretation suggests that these experiments reveal strong superconducting correlations in the pseudogap state but do not require photoinduced superconductivity. We will also discuss sensitive light reflection experiments in layered materials used as probes of electronic states. Examples include the observation of the mixed state between an electronic Wigner crystal with an electron liquid as well as the demonstration of a new type of magnetism in moire systems. Guest presentation will begin promptly at 11:00 AM

1 week, 4 days

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[QPC X PRIMUS] TOMORROW Boba Social and Thank You Note Writing Session

by Jorge Garcia Ponce

Hi yall! I hope you're having an amazing Tuesday! This *Wednesday at 4:30 pm *(till 6ish) join us for a *Thank You note writing session to Profs, TFs, etc. (with Boba)* 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 blank Thank You cards, some other crafts, and, of course, bubble tea. Please come join us :)! See you all soon! QPC X PRIMUS [image: Thank You GIFs - Find & Share on GIPHY] ᐧ

1 week, 6 days

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Lunch with Minute Physics & Earth - Tues 4/23 2 PM

by Zhu, Yi

Dear Colleagues, Kate Yoshida, from the family of YouTube channels MinutePhysics <https://www.youtube.com/@MinutePhysics>, MinuteEarth <https://www.youtube.com/@MinuteEarth>, etc. will share highlights of what the Minute team has learned during 10+ years of communicating complex topics ideas to a range of audiences. MinutePhysics alone has over 5 million subscribers and over 500 million total views! This is a great opportunity to learn how to express our research in a more approachable manner! Kate will discuss: understanding your audience, avoiding oversimplification, addressing uncertainty, and dealing with "hot" topics. *Tuesday, April 23, 2 PMScience Center Hall ALunch will be provided!* RSVP <https://minutephysicsearthharvard.splashthat.com/> [image: image.png] *This program is a part of BRIDGE Week, a week of DIB related programming put on by the Office for Diversity Inclusion and Belonging’s student Fellows. Find the full week of events on the SEAS ODIB website <https://seas.harvard.edu/office-diversity-inclusion-and-belonging/programs/…>.* Best, Yi

2 weeks

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Thursday, 4/25 at 11am: Quantum Colloquium - Eugene Demler

by Ploucha, Clare

Quantum Colloquium – Prof. Eugene Demler Thursday, April 25th, 11:00am 60 Oxford Street, Room 301 Eugene Demler, ETH Zurich Title: Illuminating Electron Correlations Developments in optical technology bring new modalities of probing electron systems. This talk will review several examples of the correlated states revealed by novel optical probes with an emphasis on the theoretical models necessary for interpreting experimental results. We will start by discussing recent experiments in the pseudogap phase of the high Tc cuprates that have been interpreted as the light induced Meissner effect. We will approach this phenomenon from the perspective of nonlinear dynamics of the sine-Gordon model triggered by the strong terahertz pump pulse. This interpretation suggests that these experiments reveal strong superconducting correlations in the pseudogap state but do not require photoinduced superconductivity. We will also discuss sensitive light reflection experiments in layered materials used as probes of electronic states. Examples include the observation of the mixed state between an electronic Wigner crystal with an electron liquid as well as the demonstration of a new type of magnetism in moire systems. Guest presentation will begin promptly at 11:00 AM

2 weeks

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SEAS DEAN'S LECTURE: Pushmeet Kohli (VP of Research, Google DeepMind)

by Ploucha, Clare

Please see below for a talk that might be of interest to the HQI Community From: Lane, Michelle <mlane(a)seas.harvard.edu> Subject: SEAS DEAN'S LECTURE: Pushmeet Kohli (VP of Research, Google DeepMind) [cid:image001.png@01DA949C.DB45E190]<https://deanslecturedeepmind.splashthat.com/> Join us next Friday, April 26 from 2-3:30pm for a SEAS Dean’s Lecture featuring Pushmeet Kohli, Vice President of Research at Google DeepMind<https://deanslecturedeepmind.splashthat.com/>. The event will be held at the Harvard Science and Engineering Complex in the Winokur Family Hall (room: SEC 1.321). Registration and HUID are required. Seating may be limited and will be available on a first-come, first-serve basis. RSVP: https://deanslecturedeepmind.splashthat.com More about the speaker: Pushmeet Kohli, Vice President of Research (AI for Science & Safety, Reliability and Security) leads the science program at Google DeepMind, which uses AI to help accelerate scientific progress in areas ranging from genomics to quantum chemistry. Pushmeet's team is responsible for AlphaFold, an AI system for predicting the 3D structure of proteins. The AlphaFold paper is one of most cited AI biology papers ever, with over 15,000 citations. His team is also working on AI systems for materials discovery and nuclear fusion. Before working at Google DeepMind, Pushmeet spent 10 years in research for Microsoft, rising to the director of research at Microsoft’s Cognition group. Pushmeet has won a number of awards including the British Machine Vision Association’s “Sullivan Doctoral Thesis Award”, and is a member of the Association for Computing Machinery's (ACM) Distinguished Speaker Program. He also leads research to ensure AI systems are safe, and was the UK government’s nominee for the Responsible AI working group as part of the Global partnership on AI. --- We hope to see you there! Michelle E. Lane | Program Manager for Industry Partnerships Harvard John A. Paulson School of Engineering and Applied Sciences

2 weeks

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[QMatter Math/Phys April 19, Fri 10:00- 11:30 ET] - Chetan Nayak (Microsoft & UCSB) Fusion Rule Measurement in a Topological Qubit - on Harvard CMSA G10

by Juven Wang

Let us welcome Prof. Chetan Nayak, this upcoming week! —————————————————————————————— *Time: Friday 10:00 am - 11:30 am ET, April 19 * *Location: Harvard CMSA G10* Zoom (Back up only, please join in person): https://harvard.zoom.us/j/977347126 <https://urldefense.proofpoint.com/v2/url?u=https-3A__harvard.zoom.us_j_9773…> Password: cmsa —————————————————————————————— Chetan Nayak (Microsoft & UCSB) Title: Fusion Rule Measurement in a Topological Qubit Abstract: Single-shot Readout of Topological Qubits -------- Subscribe to Harvard CMSA Quantum Matter and other seminar videos (more to be uploaded): https://www.youtube.com/playlist?list=PL0NRmB0fnLJQAnYwkpt9PN2PBKx4rvdup Subscribe to the Harvard CMSA seminar mailing list: https://forms.gle/1ewa7KeP6BxBuBeRA --- Harvard University CMSA, 20 Garden Street, Cambridge, MA 02138

2 weeks, 4 days

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TODAY at 12pm: Quantum Colloquium - Lin Lin

by Ploucha, Clare

Quantum Colloquium – Prof. Lin Lin Wednesday, April 17, 12:00 PM Jefferson 250 Lin Lin, Professor, Department of Mathematics, UC Berkeley Title: Quantum advantage in scientific computation? Abstract: The advent of error-corrected quantum computers is anticipated to usher in a new era in computing, with Shor's algorithm poised to demonstrate practical quantum advantages in prime number factorization. However, cryptography problems are typically not categorized as scientific computing problems. This raises the question: which scientific computing challenges are likely to benefit from quantum computers? I will first discuss some essential criteria and considerations towards realizing quantum advantages in these problems. I will then introduce some recent advancements in quantum algorithms, especially for simulating non-unitary quantum dynamics and open quantum system dynamics. The first half of the presentation is intended to be accessible to a broad audience, including both theoretical and experimental researchers. Guest presentation will begin promptly at noon

2 weeks, 5 days

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2023

2022

Qse-grad-students