@four_form

measurement at the limits of quantum mechanics and gravity (and sometimes both).

 Berkeley, CA
quantum-measurement.lbl.gov/
Joined June 2009
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Researchers have detected individual collisions of Kr, Xe, and SF6 with an optically levitated nanoparticle, validating theoretical predictions and providing a proof-of-principle for primary pressure sensor designs. Read more: go.aps.org/4yXKaKD
At the bottom, the figure displays a plot that charts the z-position of the nanosphere (series of vertical blue lines) and the reconstructed impulse amplitude (series of smaller vertical orange lines) over a 2ms window. Time is on the x-axis, and z position and impulse are on the y-axis. At the top, two smaller graphs show enlarged sections of the main plot, corresponding to two impulse events. The top-left graph displays electrical impulse and the reconstructed wave form. The top-right graph displays the reconstructed wave form from a candidate collision event with a Xenon atom. In both graphs, a dashed black line represents the signal template.

ALT At the bottom, the figure displays a plot that charts the z-position of the nanosphere (series of vertical blue lines) and the reconstructed impulse amplitude (series of smaller vertical orange lines) over a 2ms window. Time is on the x-axis, and z position and impulse are on the y-axis. At the top, two smaller graphs show enlarged sections of the main plot, corresponding to two impulse events. The top-left graph displays electrical impulse and the reconstructed wave form. The top-right graph displays the reconstructed wave form from a candidate collision event with a Xenon atom. In both graphs, a dashed black line represents the signal template.

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We are seeking candidates for the Berkeley Lab Hoffman Postdoctoral fellowships, an experimental nuclear safety-focused position. Specifically, my group can host a postdoc to work on our QuIPS experiment (link below). If interested, please reach out! phxc1b.rfer.us/LBLGOYHSs

Hoffman Distinguished Postdoctoral Fellow — Nuclear Nonproliferation in Bay Area, California,...

The Darleane C. Hoffman Distinguished Postdoctoral Fellowship is a two-year fellowship for early-career scientists who intend to build long-term...

jobs.lbl.gov
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Our experiment: quantum-measurement.lbl.gov/…

QuIPS experiment

QuIPS (Quantum Invisible Particle Sensor) is a project joint between Berkeley and the Moore lab at Yale. We are using quantum-limited optical traps and state-of-the-art electron detectors to measure...

quantum-measurement.lbl.gov
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Very nice work. One small step closer to the gravitational entanglement measurements proposed with levitated diamonds.
沖縄科学技術大学院大学
@OISTjaOct 8
量子スピンが生み出す力だけで数センチメートル規模の物体を動かすことに成功。肉眼で見える大きさの物体が量子力によって動いたのが観測されたのは初めてです。この成果は、巨視的な量子重ね合わせの実現と物理学の統一的理解に向けた重要な一歩となります。@ScienceAdvances oist.jp/ja/news-center/news/…
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Out beyond the convex hull, there is a field. I'll meet you there. When the soul lays down in that grass...
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Here's a sharper version. Genuine question. Are any of these new OAI results not obviously in the "convex hull" of what we already knew? I updated myself six months ago that these things will solve all such problems. If there's anything surprising in here, please tell me...
Daniel Carney@four_formOct 7
Have I entered my AI luddite era? I'm totally unimpressed by this list. So a tool previously used to solve a bunch of math problems solved a bunch more math problems. What bayesian update am I supposed to do with this exactly?
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Have I entered my AI luddite era? I'm totally unimpressed by this list. So a tool previously used to solve a bunch of math problems solved a bunch more math problems. What bayesian update am I supposed to do with this exactly?
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This is my optical table. There are many like it, but this one is mine.
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Berkeley quantum measurement squad, 2026!
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Replying to @KyleCranmer @AnthropicAI
How about finding the first UV divergence in N=8 SUGRA? Is that out of reach? Would be a very cool result and probably more of a milestone in amplitudes
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Given the power of AI I have been studying increasingly complex physics systems, since I am less limited by my personal computational ability. Unfortunately, this appears to mean I am now a condensed matter physicist.
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Daniel Carney retweeted
Andreas Karch
@karch_andreasSep 16
Paper day! arxiv.org/abs/2609.16154 Very proud of this one

Making the Great Desert Bloom

The absence of new physics beyond neutrino masses between the weak scale and the Planck scale is referred to as the great desert. It is often seen as a nightmare scenario for particle physics....

arxiv.org
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Daniel Carney retweeted
Peli Grietzer@peligrietzerSep 12
I think breaking down mathematicians' motivations into like 'wanting to understand math' and 'ego' misses a lot. Ppl value participating in a process where the growth of their individual understanding has a rich two-way relationship to the growth of collective understanding
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science.org/content/article/…

Physicists detect the tiny atomic collisions that give a gas its pressure

Twist on classic Brownian motion experiment could help test bounds of quantum theory and aid search for new particles

science.org
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Pretty close.
Daniel Carney@four_formAug 3
Prediction: the quantum info theory singularity will occur on Sept 8. Monday Sept 7 is a US holiday, therefore the monday listing will merge with tuesday. There will be 200 papers on quant-ph, and I will finally give up trying to read the whole thing
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Welcome to the era of zero-trust math research. You can't even send a preprint of your work to colleagues privately now without having to worry about somebody trying to scoop you with 10k agents on an internal model. Sad times.
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Screenshot from the OAI press release, which I do not feel like linking to
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We built this @BerkeleyLab. It detects electrons from nuclear decays. Could not be more proud of this little machine or the people who made it. Three years of hard work, one paper: arxiv.org/abs/2608.06661
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Laser is on when light is on
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Prediction: the quantum info theory singularity will occur on Sept 8. Monday Sept 7 is a US holiday, therefore the monday listing will merge with tuesday. There will be 200 papers on quant-ph, and I will finally give up trying to read the whole thing
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