John Preskill @preskill.bsky.social · 12hThe head that invented the surface code wears a hat that displays it. 0210
John Preskill @preskill.bsky.social · 03/09/2026Very articulate mathematicians pondering the future of math. www.quantamagazine.org/live-from-ic...quantamagazine.orgLive from ICM 2026: What Is Math For in the Age of AI? | Quanta MagazineIn this special live recording from the International Congress of Mathematicians in Philadelphia, July 2026, the central question discussed was what do mathematicians really value about doing mathemat... 042
John Preskill @preskill.bsky.social · 12/08/2026Interesting chat: Jacob Tsimerman talks to Curt Jaimungal about how AI is changing mathematics. www.youtube.com/watch?v=6uIJ...youtube.comThe Last Generation of MathematiciansYouTube video by Curt Jaimungal 050
John Preskill @preskill.bsky.social · 03/08/2026We're excited @caltech.edu and Oratomic about mitten codes, which we hope will accelerate the journey to practical quantum computing. arxiv.org/abs/2607.28795arxiv.orgHigh-rate qLDPC processorsDespite significant progress on quantum low-density parity-check (qLDPC) codes, building qLDPC processors that are high-rate, high-throughput, hardware-friendly, and fast-to-decode remains a challenge... 1212
John Preskill @preskill.bsky.social · 27/07/2026Thoughtful discussion @simonsinstitute.bsky.social led by Robert Huang on the topic researchers everywhere are talking about: How to respond to the automation of research? www.youtube.com/watch?v=vT5b...youtube.comTalk by Hsin-Yuan Huang (Oratomic, Caltech)YouTube video by Simons Institute for the Theory of Computing 0120
John Preskill @preskill.bsky.social · 18/07/2026My friend Mark Wise quantumfrontiers.com/2026/07/18/m...quantumfrontiers.comMy friend Mark WiseMark Wise, the John A. McCone Professor of High Energy Physics at Caltech, passed away on July 10 at age 72. At a recent memorial service, John Preskill made these remarks. I’m John Preskill, Mark’… 1415
John Preskill @preskill.bsky.social · 13/07/2026Mark Wise 1953-2026. Hero of theoretical particle physics, master of effective field theory, much loved teacher, mentor, and colleague, my best friend for over 40 years. An immeasurable loss. 1240
Reposted by John PreskillCaltech @caltech.edu · 01/07/2026Today, Caltech and JPL welcome renowned astrophysicist, acclaimed author, and transformative leader, Ray Jayawardhana as the Institute’s tenth president! He brings a fierce commitment to building on Caltech’s legacy of discovery and exploration. Welcome to the frontier, RayJay! l1nq.com/uci46q8caltech.eduCaltech Welcomes Ray Jayawardhana as Tenth PresidentA path-breaking scientist propelled by curiosity, Jayawardhana commits to building on the Institute's "unsurpassed legacy of discovery and impact." 0142
John Preskill @preskill.bsky.social · 19/06/2026On Wednesday we dedicated @caltech.edu’s Ginsburg Center for Quantum Precision Measurement. We won’t be moving in for a few more months, but it’s going to be a beautiful facility. We're very grateful to the generous donors who made this possible. It was a great day. www.caltech.edu/about/news/g...caltech.eduGinsburg Center for Quantum Precision Hosts Dedication CeremonyNew building will serve as a hub for the deepest explorations of the quantum realm 0152
John Preskill @preskill.bsky.social · 04/06/2026We thought that Senator Adam Schiff would want to hear about how quantum computing will benefit the world. But actually he is just really, really curious about quantum entanglement (and knows a lot about it)! Thanks for visiting @caltech.edu, Senator. It was fun. www.youtube.com/watch?v=gWhL...youtube.comQuantum for DummiesYouTube video by Sen. Adam Schiff 080
John Preskill @preskill.bsky.social · 09/05/2026I'm quite amazed, and deeply honored, to see my name on this distinguished list of "AI Pioneers." Thank you, Boston Global Forum and AI World Society, for recognizing that quantum science can contribute to "an age of human flourishing." bostonglobalforum.org/publication/...bostonglobalforum.orgAmerica at 250: AI Pioneers – The Leaders Shaping America in the Age of Artificial Intelligence | Boston Global Forum 090
John Preskill @preskill.bsky.social · 30/04/2026From dream to reality: The bridge connecting quantum information and matter to high energy physics @caltech.edu now exists. 1462
John Preskill @preskill.bsky.social · 22/04/2026Wise words from Garnet Chan on quantum computing and chemistry. www.newquantumera.com/podcast/quan...newquantumera.comQuantum Chemistry's Classical Limits with Garnet ChanOne of the most-cited arguments for near-term quantum advantage in chemistry just got a rigorous classical answer — from one of the world's leading quantum chemists. Garnet Chan's group at Caltech sol... 1161
John Preskill @preskill.bsky.social · 19/03/2026I'm looking forward to the Kavli Symposium tomorrow at the APS Global Physics Summit, where I'll speak about "The Road to Quantum Advantage." summit.aps.org/events/MAR-X02summit.aps.orgKavli Foundation Special Symposium: Quantum Science and Technology: Bridging a Shared Future for Physics and Humanity | APS Meeting 1163
John Preskill @preskill.bsky.social · 18/03/2026I'm thrilled that Charlie Bennett and Gilles Brassard have received the A. M. Turing Award for “their essential role in establishing the foundations of quantum information science and transforming secure communication and computing.” Congratulations! www.quantamagazine.org/quantum-cryp...quantamagazine.orgQuantum Cryptography Pioneers Win Turing Award | Quanta MagazineCharles Bennett and Gilles Brassard were recognized for their foundational work in quantum information science. 0283
John Preskill @preskill.bsky.social · 14/03/2026Garnet Chan reflects on recent progress using classical heuristics in computational quantum chemistry—and what it means for quantum computing. The lessons he draws can help to steer both classical and quantum approaches in scientifically productive directions. quantumfrontiers.com/2026/03/12/t...quantumfrontiers.comThe FeMo-cofactor and classical and quantum computingRecently, my coworkers and I put out a preprint “Classical solution of the FeMo-cofactor model to chemical accuracy and its implications’’ (Zhai et al. 2026). It is a bit unusual to write comm… 1273
John Preskill @preskill.bsky.social · 12/03/2026Today was the last meeting of our first-year seminar @caltech.edu: "Quantum information science today and tomorrow." I'm grateful to (from left to right) Andy, Jin, Fan, Ostap, Justin, Idil, Lily, Ella, and Ronald for their sparkling enthusiasm and many perceptive insights. 0120
John Preskill @preskill.bsky.social · 12/03/2026With characteristic attention to detail, @nicoleyh11.bsky.social offers guidance on handling faculty offers. quantumfrontiers.com/2026/03/11/n...quantumfrontiers.comNicole’s guide to navigating faculty-position offersIt’s happening. Your inbox registers an email from the chair of a faculty-hiring committee. With trembling fingers, you click on the message. “We were very impressed…we’re delighted to offer…… 0101
John Preskill @preskill.bsky.social · 28/02/2026In the last post of a 3-part series, Dominik Hangleiter highlights the importance of efficient verification of quantum advantage, and assesses the prospects for achieving it soon. quantumfrontiers.com/2026/02/28/w...quantumfrontiers.comWhat is next in quantum advantage?We are now at an exciting point in our process of developing quantum computers and understanding their computational power: It has been demonstrated that quantum computers can outperform classical … 0176
John Preskill @preskill.bsky.social · 27/02/2026It's nice to find out that I'm still an influencer in particle theory: "We thank John Preskill for suggesting the phrase “One Sum To Rule Them All,” which inspired the title of this paper." arxiv.org/abs/2602.22320arxiv.orgOne Sum To Rule Them All: A Second Order Master Rate Sum Rule for Charm DecaysWe show that within the Standard Model any system of hadronic weak charm decays related by $U$-spin satisfies the following rate sum rule: (sum of CF and DCS CKM-free rates) divided by (sum of SCS CKM... 0230
John Preskill @preskill.bsky.social · 22/02/2026Interesting format for a review article. 24 brief chapters, each offering perspective from a small subset of the 69 authors on a particular topic. quantumfrontiers.com/2026/02/11/q...quantumfrontiers.comQuantum cartographyMy husband and I visited the Library of Congress on the final day of winter break this year. In a corner, we found a facsimile of a hand-drawn map: the world as viewed by sixteenth-century European… 0161
John Preskill @preskill.bsky.social · 22/02/2026An engaging account of the remarkably rich scientific legacy of physicist Luis Alvarez. www.nybooks.com/articles/202...nybooks.comThe Wandering Physicist | Alec WilkinsonLuis Alvarez brought a scientific pragmatism to many of the twentieth century’s greatest mysteries, including the secrets of pyramids, the Kennedy assassination, and the disappearance of the dinosaurs... 073
John Preskill @preskill.bsky.social · 11/02/2026Siblings: Three of my scientific "children" (Dariel Mok, Hui Khoon Ng, Hoi-Kwong Lo) gather in Singapore. I've been blessed with many wonderful students. 0120
John Preskill @preskill.bsky.social · 02/02/2026While attending the Q2B Silicon Valley conference in December, I had this enjoyable conversation with Antonella Navarro, host of The Quantum Revolution podcast. www.youtube.com/watch?v=_Zas...youtube.comJohn Preskill on NISQ, FTQC & Quantum's FutureYouTube video by The Quantum Revolution 0110
John Preskill @preskill.bsky.social · 25/01/2026In part 2 or a 3-part series, Dominik Hangleiter continues his thoughtful assessment of the evidence for quantum advantage in random-circuit-sampling experiments. quantumfrontiers.com/2026/01/25/h...quantumfrontiers.comHas quantum advantage been achieved? Part 2: Considering the evidenceWelcome back to: Has quantum advantage been achieved? In Part 1 of this mini-series on quantum advantage demonstrations, I told you about the idea of random circuit sampling (RCS) and the experimen… 0223
John Preskill @preskill.bsky.social · 15/01/2026Here's the video of my talk on December 10 at Q2B Silicon Valley, reviewing recent progress in quantum computing. www.youtube.com/watch?v=_UoJ...youtube.comQ2B25 Silicon Valley | John Preskill, Professor, California Institute of TechnologyYouTube video by QC Ware 0154
John Preskill @preskill.bsky.social · 11/01/2026Encouraging news. www.nytimes.com/2026/01/10/s...nytimes.comCongress Is Reversing Trump’s Steep Budget Cuts to Science 0193
John Preskill @preskill.bsky.social · 06/01/2026Dominik Hangleiter weighs in with an informative post about a much debated question: Has quantum advantage been achieved? This is the first post in a three-part series. quantumfrontiers.com/2026/01/06/h...quantumfrontiers.comHas quantum advantage been achieved?Recently, I gave a couple of perspective talks on quantum advantage, one at the annual retreat of the CIQC and one at a recent KITP programme. I started off by polling the audience on who believed … 0256
John Preskill @preskill.bsky.social · 05/01/2026Ken Goldberg and I talked to The Quantum Kid about quantum computing and robots. www.youtube.com/watch?v=hkb-...youtube.comCan Quantum Computing Make Robots Smarter?YouTube video by The Quantum Kid 000
John Preskill @preskill.bsky.social · 27/12/2025It's fun to describe quantum teleportation in terms of particles that move both forward and backward in time. And it's more than just fun: the intuition derived from that description can guide us to new applications. quantumfrontiers.com/2025/12/14/m...quantumfrontiers.comMake use of time, let not advantage slipDuring the spring of 2022, I felt as though I kept dashing backward and forward in time. At the beginning of the season, hay fever plagued me in Maryland. Then, I left to present talks in sou… 081
John Preskill @preskill.bsky.social · 26/12/2025Every December since 2017, I've delivered a keynote at Q2B Silicon Valley, commenting on recent progress in quantum computing. Here is what I said this time. It's been a good year for quantum. quantumfrontiers.com/2025/12/26/q...quantumfrontiers.comQuantum computing in the second quantum centuryOn December 10, I gave a keynote address at the Q2B 2025 Conference in Silicon Valley. This is a transcript of my remarks. The slides I presented are here. The first century We are nearing the end … 0264
John Preskill @preskill.bsky.social · 14/12/2025In predicting properties of electronic structure or deciphering signals produced by Nature, will classical artificial intelligence eat quantum's lunch? Here @robbieking1000.bsky.social considers the issue from the perspective of complexity theory. quantumfrontiers.com/2025/12/11/c...quantumfrontiers.comCan AI Predict the Quantum Universe?AI promises to revolutionize the way we do science, which raises a central technological question of our time: Can classical AI understand all natural phenomena, or are some fundamentally beyond it… 0142
John Preskill @preskill.bsky.social · 06/11/2025The Institute for Quantum Information (and Matter) @caltech.edu is celebrating its 25th anniversary. It has been a great run so far, and quantum information science is more fun now than ever! www.caltech.edu/about/news/c...caltech.eduCaltech's Pioneering Quantum Hub Celebrates 25 YearsJohn Preskill reflects on the history and impact of IQIM 1262
John Preskill @preskill.bsky.social · 04/11/2025The DOE National Quantum Information Science Research Centers continue their mission. www.energy.gov/articles/ene...energy.govEnergy Department Announces $625 Million to Advance the Next Phase of National Quantum Information Science Research CentersThe U.S. Department of Energy today announced $625 million in funding to renew its five National Quantum Information Science Research Centers. 1194
John Preskill @preskill.bsky.social · 04/11/2025"... physicists adore apparent contradictions ..." Yes we do! Doesn't everyone? quantumfrontiers.com/2025/10/26/t...quantumfrontiers.comThe sequelThis October, fantasy readers are devouring a sequel: the final installment in Philip Pullman’s trilogy The Book of Dust. The series follows student Lyra Silvertongue as she journeys from Oxford to… 290
John Preskill @preskill.bsky.social · 01/11/2025The annual retreat of @caltech.edu's Institute for Quantum Information and Matter (IQIM) is an opportunity to spend the weekend with some of my favorite scientists. It is always an uplifting and illuminating experience. 0221
John Preskill @preskill.bsky.social · 29/10/2025Now under construction: The bridge connecting research on quantum matter and quantum information in the Ginsburg Center @caltech.edu to the high energy theory group in Downs-Lauritsen Laboratory. Exciting! 2201
John Preskill @preskill.bsky.social · 24/10/2025When and how will quantum computing broadly benefit humanity? Despite exhilarating recent progress, we still don’t know. Here my friend Jens Eisert and I assess the current status and the challenges ahead. arxiv.org/abs/2510.19928arxiv.orgMind the gaps: The fraught road to quantum advantageQuantum computing is advancing rapidly, yet substantial gaps separate today's noisy intermediate-scale quantum (NISQ) devices from tomorrow's fault-tolerant application-scale (FASQ) machines. We ident... 1769
John Preskill @preskill.bsky.social · 19/10/2025Aside from Yang-Mills theory and parity nonconservation, Yang made so many profound contributions to physics! One that deeply impressed me as I was starting grad school: a 1975 paper with T. T. Wu highlighting the role of fiber bundles in gauge theory. www.nytimes.com/2025/10/18/s...nytimes.comChen Ning Yang, Nobel-Winning Physicist, Is Dead at 103 1314
John Preskill @preskill.bsky.social · 17/10/2025Thanks, Ingrid Fadelli, for this nice article about our recently published paper with Robert Huang and Mehdi Soleimanifar. The paper describes a surprisingly simple protocol for verifying that a many-qubit state in the lab matches a desired target state. phys.org/news/2025-10...phys.orgRigorous approach quantifies and verifies almost all quantum statesQuantum information systems, systems that process, store or transmit information leveraging quantum mechanical effects, could, in principle, outperform classical systems in some optimization, computat... 060
John Preskill @preskill.bsky.social · 07/10/2025The pioneering work of Clarke, Devoret, and Martinis showed that very cold electrical circuits behave in ways that exhibit fundamental principles of quantum physics. www.nobelprize.org/prizes/physi...nobelprize.orgNobel Prize in Physics 2025The Nobel Prize in Physics 2025 was awarded jointly to John Clarke, Michel H. Devoret and John M. Martinis "for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an... 2597
John Preskill @preskill.bsky.social · 25/09/20256,100 neutral-atom qubits trapped in a grid by lasers @caltech.edu ... is a lot. www.caltech.edu/about/news/c...caltech.eduCaltech Team Sets Record with 6,100-Qubit ArrayThe neutral-atom platform shows promise for scaling up quantum computers. 2719
John Preskill @preskill.bsky.social · 18/09/2025I’m deeply honored to receive the 2025 Academic Pioneer of the Year Award from the Quantum World Congress. Curiosity-driven fundamental research revealed the promise of quantum science and technology, and will be just as vital for future advances. quantumfrontiers.com/2025/09/18/j...quantumfrontiers.comJohn Preskill receives 2025 Quantum Leadership AwardThe 2025 Quantum Leadership Awards were announced at the Quantum World Congress on 18 September 2025. Upon receiving the Academic Pioneer of the Year Award, John Preskill made these remarks. I’m en… 1351
John Preskill @preskill.bsky.social · 29/08/2025The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026. 0241
John Preskill @preskill.bsky.social · 18/08/2025Useful advice from @nicoleyh11.bsky.social. quantumfrontiers.com/2025/08/10/n...quantumfrontiers.comNicole’s guide to writing research statementsSunflowers are blooming, stores are trumpeting back-to-school sales, and professors are scrambling to chart out the courses they planned to develop in July. If you’re applying for an academic job t… 0194
John Preskill @preskill.bsky.social · 17/08/2025The QEC25 conference hosted by @yaleqi.bsky.social was really excellent, and videos of all talks are available. So much recent progress on quantum error correction! qec25.yalepages.orgqec25.yalepages.orgQEC25 1267
John Preskill @preskill.bsky.social · 11/08/2025We’re excited to propose and validate simple methods for preparing ground states and thermal states of many-particle quantum systems, which might be feasible for early fault-tolerant quantum devices. All the credit goes to my brilliant collaborators Zhiyan, Yongtao, and Lin arxiv.org/abs/2508.05703arxiv.orgEnd-to-End Efficient Quantum Thermal and Ground State Preparation Made SimpleWe propose new quantum algorithms for thermal and ground state preparation based on system-bath interactions. These algorithms require only forward evolution under a system-bath Hamiltonian in which t... 1391
John Preskill @preskill.bsky.social · 11/08/2025The infectious enthusiasm of my wonderful co-authors (Robert Huang, Soonwon Choi, Jarrod McClean) drove this upbeat assessment of “The Vast World of Quantum Advantage.” arxiv.org/abs/2508.05720arxiv.orgThe vast world of quantum advantageThe quest to identify quantum advantages lies at the heart of quantum technology. While quantum devices promise extraordinary capabilities, from exponential computational speedups to unprecedented mea... 1465
John Preskill @preskill.bsky.social · 09/08/2025Talking quantum with Brian. www.youtube.com/watch?v=EKfs...youtube.comThe Quantum Frontier with Brian Greene and John PreskillYouTube video by World Science Festival 0306
John Preskill @preskill.bsky.social · 09/08/2025In our world of (noisy) data, error correction is everywhere, as Mary Wootters eloquently explains. www.quantamagazine.org/how-can-math...quantamagazine.orgHow Can Math Protect Our Data? | Quanta MagazineMary Wootters discusses how error-correcting codes work, and how they are essential for reliable communication and storage. 0236
