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John Preskill

@preskill

Caltech theoretical physicist

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13.10.2023
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Latest posts by John Preskill @preskill

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What 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 …

In 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...

28.02.2026 20:30 πŸ‘ 17 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0
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One Sum To Rule Them All: A Second Order Master Rate Sum Rule for Charm Decays We 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...

It's nice to find out that I'm still an influencer in particle theory:

"We thank John Preskill for suggesting the phrase β€œOne Sum To Rule Them All,” which inspired the title of this paper."

arxiv.org/abs/2602.22320

27.02.2026 21:16 πŸ‘ 23 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Quantum cartography My 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…

Interesting 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...

22.02.2026 21:07 πŸ‘ 16 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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The Wandering Physicist | Alec Wilkinson Luis 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...

An engaging account of the remarkably rich scientific legacy of physicist Luis Alvarez.
www.nybooks.com/articles/202...

22.02.2026 20:20 πŸ‘ 8 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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Siblings: Three of my scientific "children" (Dariel Mok, Hui Khoon Ng, Hoi-Kwong Lo) gather in Singapore. I've been blessed with many wonderful students.

11.02.2026 17:46 πŸ‘ 11 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
John Preskill on NISQ, FTQC & Quantum's Future
John Preskill on NISQ, FTQC & Quantum's Future YouTube video by The Quantum Revolution

While 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...

02.02.2026 18:04 πŸ‘ 11 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Has quantum advantage been achieved? Part 2: Considering the evidence Welcome 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…

In 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...

25.01.2026 18:33 πŸ‘ 23 πŸ” 3 πŸ’¬ 0 πŸ“Œ 1
Q2B25 Silicon Valley | John Preskill, Professor, California Institute of Technology
Q2B25 Silicon Valley | John Preskill, Professor, California Institute of Technology YouTube video by QC Ware

Here'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...

15.01.2026 18:14 πŸ‘ 15 πŸ” 4 πŸ’¬ 0 πŸ“Œ 1
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Congress Is Reversing Trump’s Steep Budget Cuts to Science

Encouraging news.

www.nytimes.com/2026/01/10/s...

11.01.2026 19:01 πŸ‘ 19 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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Has 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 …

Dominik 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...

06.01.2026 21:15 πŸ‘ 24 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0
Can Quantum Computing Make Robots Smarter?
Can Quantum Computing Make Robots Smarter? YouTube video by The Quantum Kid

Ken Goldberg and I talked to The Quantum Kid about quantum computing and robots.
www.youtube.com/watch?v=hkb-...

05.01.2026 16:37 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Make use of time, let not advantage slip During the spring of 2022, I felt as though I kept dashing backward and forward in time.Β  At the beginning of the season, hay fever plagued me in Maryland. Then, I left to present talks in sou…

It'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...

27.12.2025 21:53 πŸ‘ 9 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Quantum computing in the second quantum century On December 10, I gave a keynote address at theΒ Q2B 2025 ConferenceΒ in Silicon Valley. This is a transcript of my remarks. The slides I presented are here. The first century We are nearing the end …

Every 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...

26.12.2025 23:23 πŸ‘ 28 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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Can 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…

In 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...

14.12.2025 18:16 πŸ‘ 15 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Caltech's Pioneering Quantum Hub Celebrates 25 Years John Preskill reflects on the history and impact of IQIM

The 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...

06.11.2025 01:34 πŸ‘ 27 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0

"... strengthening the quantum innovation ecosystem, accelerating discoveries that power next-generation technologies, and securing American leadership in quantum computing, hardware, and applications."

04.11.2025 18:35 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Energy Department Announces $625 Million to Advance the Next Phase of National Quantum Information Science Research Centers The U.S. Department of Energy today announced $625 million in funding to renew its five National Quantum Information Science Research Centers.

The DOE National Quantum Information Science Research Centers continue their mission.
www.energy.gov/articles/ene...

04.11.2025 18:35 πŸ‘ 19 πŸ” 4 πŸ’¬ 1 πŸ“Œ 2
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The sequel This 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…

"... physicists adore apparent contradictions ..."
Yes we do! Doesn't everyone?
quantumfrontiers.com/2025/10/26/t...

04.11.2025 00:09 πŸ‘ 9 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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The 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.

01.11.2025 20:53 πŸ‘ 22 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Now 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!

29.10.2025 17:13 πŸ‘ 20 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0

We are optimistic about the quantum future, but there's a lot of work to do.

24.10.2025 04:41 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Mind the gaps: The fraught road to quantum advantage Quantum 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...

When 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/2510.19928

24.10.2025 04:40 πŸ‘ 76 πŸ” 9 πŸ’¬ 1 πŸ“Œ 5

This one:
journals.aps.org/prd/pdf/10.1...

19.10.2025 17:54 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Chen Ning Yang, Nobel-Winning Physicist, Is Dead at 103

Aside 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...

19.10.2025 17:52 πŸ‘ 30 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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Rigorous approach quantifies and verifies almost all quantum states Quantum information systems, systems that process, store or transmit information leveraging quantum mechanical effects, could, in principle, outperform classical systems in some optimization, computat...

Thanks, 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...

17.10.2025 16:55 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Building on this achievement, Devoret, Martinis, and many others are constructing quantum computers, powerful tools for exploring quantum science and solving very hard computational problems. Congratulations!

07.10.2025 14:37 πŸ‘ 9 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Nobel Prize in Physics 2025 The 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...

The 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...

07.10.2025 14:35 πŸ‘ 59 πŸ” 7 πŸ’¬ 2 πŸ“Œ 1
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Caltech Team Sets Record with 6,100-Qubit Array The neutral-atom platform shows promise for scaling up quantum computers.

6,100 neutral-atom qubits trapped in a grid by lasers @caltech.edu ... is a lot.

www.caltech.edu/about/news/c...

25.09.2025 20:18 πŸ‘ 73 πŸ” 10 πŸ’¬ 3 πŸ“Œ 3
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John Preskill receives 2025 Quantum Leadership Award The 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…

I’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...

18.09.2025 17:12 πŸ‘ 35 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026.

28.08.2025 23:52 πŸ‘ 24 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0