ewin @ewintang
postdoc in theory, UC Berkeley EECS & Miller Institute ewintang.com Joined November 2018-
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After all this hard work... finally presenting your brilliant results at FOCS, but only 12 people are in the audience? Want to reach a wider audience? Come to our FOCS'23 Wiki-edit-a-thon! W/ Shuchi Chawla, @DivyarthiMohan, and @ewintang. sites.google.com/view/tcs-edit-…
Do you know what q-means? And what about k-means? We (João Doriguello, @ewintang and I) improved by several order of magnitude the "old" #quantum k-means algorithm that we (Kerenidis, Landman, Prakash, and I) did in 2019. We also show a dequantized algo. arxiv.org/abs/2308.09701
Thanks for the kind words! See also my lecture notes & problem sets at ewintang.com/pcmi/
Thanks for the kind words! See also my lecture notes & problem sets at ewintang.com/pcmi/
Jens Eisert @jenseisert
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John Preskill @preskill
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Clément Canonne @ccanonne_
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Andreas Wallraff @AndreasAtETH
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Graeme Smith @quantum_graeme
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Isaac Kim @Isaac__kim
4K Followers 452 Following Working on quantum information, computation, and many-body physics. Assistant Professor of Computer Science @ UC Davis.
Tom Gur @TomGur
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Olivia Lanes @Liv_Lanes
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Zlatko Minev @zlatko_minev
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ieva @HyperboIeva
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Felix Leditzky 🏳�.. @felix_led
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Thomas Lin @7homaslin
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d @d_everyt
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wenjie 文捷 @wenjieda
141 Followers 244 Following PhD student @ MIT Physics | Harvard ‘22 | @PDSoros @HertzFoundation Fellow ‘22
Sun Woo Kim @SunWooPKim
124 Followers 96 Following PhD candidate in theoretical condensed matter physics, King's College London
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John Preskill @preskill
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Clément Canonne @ccanonne_
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Anthony Leverrier @letonyo
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Graeme Smith @quantum_graeme
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Gautam Kamath @thegautamkamath
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Isaac Kim @Isaac__kim
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Tom Gur @TomGur
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Earl T Campbell @earltcampbell
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Alvaro M. Alhambra @AlhambraAlvaro
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3K Followers 1K Following Assistant Professor at @UofIllinois (Math) & @IllinoisQuantum member | Quantum information theorist | Vienna native | He/Him
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Xueyue(Sherry) Zhang @XueyueZ
379 Followers 253 Following Miller Postdoc Fellow @UCBerkeley in Quantum devices | Ph.D. @Caltech
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286 Followers 111 Following science, mostly quantum. currently @utaustin, previously @stanford @perimeter @caltech
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239 Followers 660 Following CS theory PhD at @CarnegieMellon. Previously quant trader at @AkunaCapital. Favorite vegetable: cabbage
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167 Followers 225 Following Cybersecurity researcher, interested in microarchitectural and hardware security. Currently PhD student at UW. @[email protected]
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389 Followers 190 Following @CNRS Research Director at @IRIF_Paris (@CNRSinformatics, @Univ_Paris_Cite) working on randomized and quantum algorithms
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Retraction Watch @RetractionWatch
92K Followers 20 Following Daily newsletter https://t.co/T4dNEAd2zy Database https://t.co/Wx3LmYCtGk Tips [email protected] (better than @ replies) Donate https://t.co/qh4sIBw1uU
Noah @NoahSD@mathstod.. @NoahSD
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517 Followers 319 Following
Yihui Quek @quekpottheories
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Anna Go @_anna_go
525 Followers 106 Following Research Fellow at IAIFI @iaifi_news, PhD in Theoretical Physics from @Perimeter and @UWaterloo, PSI 2016/2017
Zhengfeng Ji @jizhengfeng
64 Followers 159 Following
Alex Bredariol Grilo @abgrilo
769 Followers 823 Following Researcher at @LIP6_Lab (@CNRS/@Sorbonne_Univ_) working on quantum complexity theory and quantum cryptography. he/him 🏳️🌈🇧🇷
Victor Zhong @hllo_wrld
4K Followers 450 Following ML+NLP assistant prof @UWCheritonCS. Formerly @MSFTResearch @MetaAI, @SFResearch via @MetamindIO, @uwnlp, @StanfordNLP, @eceuoft.
Justin Thaler @SuccinctJT
5K Followers 73 Following Research Partner @ a16z crypto Associate Professor of CS at Georgetown.
Maxim Raginsky @mraginsky
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New paper: IQP circuit sampling, a leading test of quantum supremacy, turns out to be classically simulatable for noisy circuits beyond an O(1) depth! Really excited about this work with @joelrajakumar and Yi-Kai Liu! scirate.com/arxiv/2403.146…
Maybe this is why the government is investing so much in quantum computing. Get @ewintang on the case!
New paper today! We analyzed a recent Gibbs sampling algorithm based on a new kind of Lindbladian operator by Chen, Kastoryano and Gilyén arxiv.org/abs/2311.09207, and found that you can do some pretty interesting things with it. @CambyseRouze @dsfranca (arxiv.org/abs/2403.12691)
Check out our new paper out today about efficient quantum Gibbs sampling at high temperatures and universal quantum computation with Gibbs states at log(n) temperatures! And thanks to @AlhambraAlvaro and @CambyseRouze for the fun collaboration!
New paper today! We analyzed a recent Gibbs sampling algorithm based on a new kind of Lindbladian operator by Chen, Kastoryano and Gilyén arxiv.org/abs/2311.09207, and found that you can do some pretty interesting things with it. @CambyseRouze @dsfranca (arxiv.org/abs/2403.12691)
@ewintang @AineshBakshi Noob question: do we care about unentangled systems?
@ewintang @AineshBakshi Is this a revival of the sudden death of entanglement?
@ewintang Nice work @ewintang ! This old work from Braunstein et al. Might be related journals.aps.org/prl/abstract/1…
@ewintang I'd say this is related, as for high-enough temperature one is close to the maximally mixed state and thus unentangled (in your case the threshold temperature seems to be independent of the size, at a quick glance, and I am not sure how it compares) arxiv.org/abs/quant-ph/0…
I think a fine-grained understanding of the complexity and structure landscape of Gibbs state preparation is ripe for future work.
Our algorithm also implies there’s no quantum advantage for preparing Gibbs states above a constant temperature. Below a different constant, this problem becomes NP-hard, even for classical spin systems (Sly-Sun'14).
In contrast, for any local Hamiltonian, entanglement (quantum correlations) exists at low temperature, and entirely disappears at constant temperature. This sudden death of entanglement is particularly surprising to me (s/o to @AlhambraAlvaro for pointing us to ESD lit)
Consider instead, classical spin systems. At low temperature, they exhibit long-range correlations, and as the temperature increases, the strength of these correlations decays gracefully. In particular, at constant temperature, they exhibit short-range correlations.
In this new preprint, Allen Liu, Ankur Moitra, @ewintang and I showed that quantum systems at thermal equilibrium at any temperature higher than a fixed constant must have *zero* entanglement.
Consider a system of locally interacting qubits in thermal equilibrium. We show: above a fixed constant temperature, these states are *fully unentangled* and *easy to prepare*! Joint work with @AineshBakshi, Allen Liu, and Ankur Moitra. I find the entanglement result surprising;
New game: cookie clicker, but you have to solve math problems bigprimes.org/idlepi
I’m so excited to post my first paper in graduate school! Also, happy Lunar New Year to everyone! 🎉
Together with Jeongwan and Yunchao @lyc1178, we propose a simple construction of approximate unitary t-designs on n qubits using random Pauli rotations in circuit depth O(t^2 n log n). This improves the previous best brickwall random quantum circuit construction of depth O(t^5 n)
Hamiltonian learning at low temperatures in poly time. Plenary by Allen Liu. QIP Best student paper award winner.
a very good sign for our field that so many of the plenaries at QIP are given by grad students and postdocs.
At least 3 of the 5 long plenaries have student/postdoctoral presenters. It might be 4/5, I’m not sure.
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