John Preskill
@preskill.bsky.social
Caltech theoretical physicist
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.
November 1, 2025 at 8:53 PM
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.
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!
October 29, 2025 at 5:13 PM
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!
The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026.
August 28, 2025 at 11:52 PM
The Ginsburg Center for Quantum Precision Measurement @caltech.edu now stands 4 stories high. Opens summer 2026.
Great dinner conversation with SURF students @caltech.edu! (SURF = Summer Undergraduate Research Fellowship).
July 18, 2025 at 3:29 AM
Great dinner conversation with SURF students @caltech.edu! (SURF = Summer Undergraduate Research Fellowship).
Yiyi Cai has done research in our group @caltech.edu for two years, including a senior thesis. She'll be a Gates Cambridge Scholar for a year, followed by PhD studies in computer science at Stanford. Congratulations, Yiyi, you'll be missed!
June 6, 2025 at 5:10 PM
Yiyi Cai has done research in our group @caltech.edu for two years, including a senior thesis. She'll be a Gates Cambridge Scholar for a year, followed by PhD studies in computer science at Stanford. Congratulations, Yiyi, you'll be missed!
The building committee gets a first look at the basement of the Ginsburg Center for Quantum Precision Measurement at Caltech. We're standing where a tunnel will connect Ginsburg labs to labs in neighboring Downs Laboratory. With me are Nick Hutzler, Rana Adhikari, Michelle Effros, and Dave Hsieh.
May 31, 2025 at 6:49 PM
The building committee gets a first look at the basement of the Ginsburg Center for Quantum Precision Measurement at Caltech. We're standing where a tunnel will connect Ginsburg labs to labs in neighboring Downs Laboratory. With me are Nick Hutzler, Rana Adhikari, Michelle Effros, and Dave Hsieh.
A delightful evening at Caltech's Venerable House.
May 3, 2025 at 4:28 AM
A delightful evening at Caltech's Venerable House.
Thanking Ashvin Vishwanath for his brilliant Lauritsen Lecture @Caltech on "The Return of Anyons," with colleagues Hirosi Ooguri, Nai-Chang Yeh, and Lesik Motrunich.
May 2, 2025 at 3:56 AM
Thanking Ashvin Vishwanath for his brilliant Lauritsen Lecture @Caltech on "The Return of Anyons," with colleagues Hirosi Ooguri, Nai-Chang Yeh, and Lesik Motrunich.
Congratulations, Jeongwan Haah, recipient of the New Horizons in Physics Prize "for the discovery of Haah's code, in which fractal conservation laws emerge, and other models bringing discrete mathematical structures to physics"!
breakthroughprize.org/News/91
breakthroughprize.org/News/91
April 6, 2025 at 4:12 PM
Congratulations, Jeongwan Haah, recipient of the New Horizons in Physics Prize "for the discovery of Haah's code, in which fractal conservation laws emerge, and other models bringing discrete mathematical structures to physics"!
breakthroughprize.org/News/91
breakthroughprize.org/News/91
With two of my students from the 1990s who made good: Hoi-Kwong Lo and Daniel Gottesman. #APSSummit25
March 21, 2025 at 11:54 PM
With two of my students from the 1990s who made good: Hoi-Kwong Lo and Daniel Gottesman. #APSSummit25
Six our of eight randomly selected @qip2025.bsky.social attendees have been @caltech.edu as student, postdoc, or professor.
February 26, 2025 at 1:35 PM
Six our of eight randomly selected @qip2025.bsky.social attendees have been @caltech.edu as student, postdoc, or professor.
In 1999, I wrote a paper on "Quantum information and precision measurement" with two brilliant undergrads @caltech.edu, @joerenes.bsky.social and Andrew Childs. Here we are reunited @qip2025.bsky.social . (Former student @nickrhj.bsky.social is in the background.)
February 26, 2025 at 1:29 PM
In 1999, I wrote a paper on "Quantum information and precision measurement" with two brilliant undergrads @caltech.edu, @joerenes.bsky.social and Andrew Childs. Here we are reunited @qip2025.bsky.social . (Former student @nickrhj.bsky.social is in the background.)
Over 900 participants today @qip2025.bsky.social.
February 24, 2025 at 2:06 PM
Over 900 participants today @qip2025.bsky.social.
I'm glad to be at the University of Maryland to celebrate 10 years of exciting scientific contributions from QuICS. And we're proud that 7 of the QuICS Fellows passed through Caltech as students and postdocs.
January 23, 2025 at 2:47 AM
I'm glad to be at the University of Maryland to celebrate 10 years of exciting scientific contributions from QuICS. And we're proud that 7 of the QuICS Fellows passed through Caltech as students and postdocs.
Citation counts continue to defy my expectations.
scholar.google.com/citations?us...
scholar.google.com/citations?us...
January 2, 2025 at 10:26 PM
Citation counts continue to defy my expectations.
scholar.google.com/citations?us...
scholar.google.com/citations?us...
We had so much fun in my first-year seminar “Quantum information science today and tomorrow;” I was blown away by the brilliance and enthusiasm of the students. L to R: Toby, Joel, Mitchell, Hardit, me, Max, Amudhan, Jason, Priyanka, Benjamin (all freshmen @caltech.edu ).
December 8, 2024 at 4:33 PM
We had so much fun in my first-year seminar “Quantum information science today and tomorrow;” I was blown away by the brilliance and enthusiasm of the students. L to R: Toby, Joel, Mitchell, Hardit, me, Max, Amudhan, Jason, Priyanka, Benjamin (all freshmen @caltech.edu ).
On November 15, I spoke about my PhD advisor Steve Weinberg at a conference in his honor at the University of Texas. Slides from my talk are here: preskill.caltech.edu/talks/Preski...
December 6, 2024 at 4:31 AM
On November 15, I spoke about my PhD advisor Steve Weinberg at a conference in his honor at the University of Texas. Slides from my talk are here: preskill.caltech.edu/talks/Preski...
Using tensor network methods, we studied wave-packet collisions in Ising field theory. These pictures depict various processes that occur. Time is on the vertical axis and spatial position is on the horizontal axis. The colors show the energy density relative to the vacuum state.
November 22, 2024 at 9:34 PM
Using tensor network methods, we studied wave-packet collisions in Ising field theory. These pictures depict various processes that occur. Time is on the vertical axis and spatial position is on the horizontal axis. The colors show the energy density relative to the vacuum state.
Among the Ultra-Quantum Matter mavens in Lake Arrowhead, CA with former students Jeongwan Haah and Isaac Kim and current postdoc @Caltech.edu Dan Ranard.
November 22, 2024 at 8:05 PM
Among the Ultra-Quantum Matter mavens in Lake Arrowhead, CA with former students Jeongwan Haah and Isaac Kim and current postdoc @Caltech.edu Dan Ranard.
Future basement of the Ginsburg Center for Quantum Precision Measurement at Caltech.
November 19, 2024 at 2:46 AM
Future basement of the Ginsburg Center for Quantum Precision Measurement at Caltech.