December 2023 - Qse-grad-students

by Zhu, Yi

Hi everyone! We are a group of grad students in HQI interested in sharing the quantum science research happening here at Harvard to the broader public, and in particular high school and college students. We are excited to share a preview of the HQI Blog <https://www.hqi-blog.com>, where we hope to break down research articles into accessible summaries and demystify quantum mechanics through tutorials—among many other things! Our group is also eagerly crafting content to offer everyone an engaging glimpse into the world of scientific research. For starters, check out our playful 2023 Holiday Gift Guide <https://www.hqi-blog.com/comics/holiday-gift-guide-2023>and feel free to share with family and friends! Stay tuned for upcoming content (including fun interviews with new HQI faculty!) and opportunities to contribute to the website in the new year! Cheers, Binhan, Dom, Haley, Lizette, Danilo, Andrew, Albert, Yi

4 months, 2 weeks

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Today. 1-1:30pm. Margarita Davydova Talk (HQI Quantum Fest 2023)

by Gallagher, Claire M.

Margarita Davydova Talk - (HQI Quantum Fest 2023) Today. 1pm-1:30pm via Zoom. Please see below for the log-in information. Title: Floquet codes, automorphisms, and quantum computation Abstract: In my talk, I will introduce our recent generalizations of Floquet codes, which are a new kind of quantum error-correcting codes defined by periodic measurement sequences. In particular, we propose a new kind of measurement-based quantum computation inspired by these codes. In this model, the quantum logical gates are implemented by short sequences of low-weight (namely, two- and rarely, three-qubit) measurements which simultaneously encode logical information and enable error correction. Our model for quantum computation can be viewed as a nontrivial dynamics of quantum information that is both induced and protected by the same set of measurements. We introduce a new class of quantum error-correcting codes which we call dynamic automorphism codes. We construct explicit examples, called dynamic automorphism color codes, that can implement the full Clifford group in 2+1d and a non-Clifford gate in 3+1d, making the first step towards universal quantum computation in this model. The talk is based on recent work with Nathanan Tantivasadakarn, Shankar Balasubramanian, and David Aasen [PRX Quantum 4, 020341 (2023)]; [arxiv: 2307.10353]. Join Zoom meeting https://harvard.zoom.us/j/91759704175?pwd=S1JZVWI2NHNuTmpvWGJlcEkva2N5dz09 Password: 659850 Join by telephone (use any number to dial in) +1 929 436 2866 +1 301 715 8592 +1 305 224 1968 +1 309 205 3325 +1 312 626 6799 +1 646 931 3860 +1 386 347 5053 +1 507 473 4847 +1 564 217 2000 +1 669 444 9171 +1 669 900 6833 +1 689 278 1000 +1 719 359 4580 +1 253 205 0468 +1 253 215 8782 +1 346 248 7799 +1 360 209 5623 International numbers available: https://harvard.zoom.us/u/acXdtzngVi One tap mobile: +19294362866,,91759704175# US (New York) Join by SIP conference room system Meeting ID: 917 5970 4175 91759704175.659850(a)zoomcrc.com<mailto:91759704175.659850@zoomcrc.com> Claire M. Gallagher Staff Assistant III Harvard Quantum Initiative 33 Oxford Street, MD 351 Cambridge, MA 02138 P. (617) 496-2361

4 months, 3 weeks

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[Quantum Matter Joint seminar Dec 8, Friday 2:30 - 4 pm] Da-Chuan Lu (UCSD) - Fermi surface symmetric mass generation and its application in nickelate superconductor @ Harvard CMSA G10 and zoom 977347126

by Juven Wang

[Quantum Matter Joint seminar: Quantum Matter in Mathematics and Physics & Topological Quantum Matter, Dec 8 Friday 2:30 - 4 pm] Let us welcome Da-Chuan! -------------------- This seminar will be in person! Time: Dec 8 Friday 2:30 - 4 pm ET Location: Harvard CMSA G10 Zoom: https://harvard.zoom.us/j/977347126 Password: cmsa —————————————————— Da-Chuan Lu (UCSD) Title: Fermi surface symmetric mass generation and its application in nickelate superconductor Abstract: Symmetric mass generation (SMG) is a novel interaction-driven mechanism that generates fermion mass without breaking symmetry, unlike the standard Anderson-Higgs mechanism. SMG can occur in the fermion system without quantum anomalies. In this talk, I will focus on the SMG for the systems with finite fermion density, i.e., the Fermi surface. I will discuss the Fermi surface anomaly and Fermi surface SMG. Lastly, I will talk about its application in the newly found nickelate superconductors, where the superconductivity emerges without a nearby spontaneous symmetry-breaking phase. -------------------- 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 https://cmsa.fas.harvard.edu

5 months