Tootfinder

Frequency Differences between Clocks on the Earth and the Moon
Mingyue Zhang, J\"urgen M\"uller, Sergei M. Kopeikin
https://arxiv.org/abs/2506.16377

Frequency Differences between Clocks on the Earth and the Moon
Based on general relativity, clock comparisons enable the determination of the gravity potential relative to a stable reference. Lunar surface clocks, owing to the Moon's low-noise conditions, high orbital stability, and broad Earth visibility, are promising reference clocks for global-scale comparisons between terrestrial clocks. Meanwhile, the need for an independent lunar time system-driven by future lunar navigation-requires maintaining links to terrestrial standards. This Letter simulates …

Trump Scores DOGE Win in Senate; Clock's Ticking in House (Ed Morrissey/HotAir)
https://hotair.com/ed-morrissey/2025/07/17/trump-gets-win-as-senate-agrees-to-cut-spending-clocks-ticking-in-house-n3804871
http://www.memeorandum.com/250717/p67#a250717p67

A spacetime-covariant approach to inertial and accelerated quantum clocks in first-quantization
Eduardo A. B. Oliveira, Andre G. S. Landulfo
https://arxiv.org/abs/2508.05897 htt…

A spacetime-covariant approach to inertial and accelerated quantum clocks in first-quantization
It is expected that a quantum theory of gravity will radically alter our current notion of spacetime geometry. However, contrary to what was commonly assumed for many decades, quantum gravity effects could manifest in scales much larger than the Planck Scale, provided that there is enough coherence in the superposition of geometries. Quantum Clocks, i.e. quantum mechanical systems whose internal dynamics can keep track of proper-time lapses, are a very promising tool for probing such low-energy…

Some serious #Milwaukee content in this tune. I remember the burgers in 1987, back before I hit double digits. That was probably the last time I believed the #Brewers might win something. The only thing missing is a reference to Webb's two clocks.

Replaced article(s) found for physics.atom-ph. https://arxiv.org/list/physics.atom-ph/new
[1/1]:
- SI-Traceable Temperature Calibration Based on Optical Lattice Clocks
Jin Cao, Xiaotong Lu, Benquan Lu, Hong Chang

Remember the good old days when you could send an letter to the US Gov't at Fort Collins, Colorado. You'd include a self-addressed stamped envelope and a cassette tape and they would return the cassette with a recording of WWV so that you could set your clocks.
You think that is silly? Is it any more silly than that the maga-klan is trying to make US citizens buy weather (data that was acquired via US assets and taxes) from private dealers such as Accuweather?

from my link log —
Graham: synchronizing clocks by measuring server temperature.
https://www.usenix.org/conference/nsdi22/presentation/najafi
saved 2025-04-17

Natural Ultralight Dark Matter: The Quadratic Twin
C\'edric Delaunay, Michael Geller, Zamir Heller-Algazi, Gilad Perez, Konstantin Springmann
https://arxiv.org/abs/2507.12514 …

Natural Ultralight Dark Matter: The Quadratic Twin
Scalar ultralight dark matter (ULDM) is uniquely accessible to tabletop experiments such as clocks and interferometers, and its search has been the focus of a vast experimental effort. However, the scalar ULDM mass is not protected from radiative corrections, and the entirety of the parameter space within reach of experiments suffers from a severe naturalness problem. In this paper, we propose a new twin mechanism that protects the mass of the scalar ULDM. Our scalar ULDM is a pseudo-Nambu-Gold…

🇺🇦 Auf radioeins läuft...
Coldplay:
🎵 X & Y
#NowPlaying #Coldplay
https://y4enn.bandcamp.com/track/coldplay-clocks-techno
https://open.spotify.com/track/7LVHVU3tWfcxj5aiPFEW4Q

Hybrid-Locked Kerr Microcombs for Flexible On-Chip Optical Clock Division
Andrei Diakonov, Konstantin Khrizman, Liron Stern
https://arxiv.org/abs/2508.07258 https://

Hybrid-Locked Kerr Microcombs for Flexible On-Chip Optical Clock Division
Optical atomic clocks deliver unrivaled precision, yet their size and complexity still confine them to specialized laboratories. Frequency combs provide the crucial optical-to-microwave division needed for clock readout, but conventional fiber- or bulk-laser combs are far too large for portable use. The advent of chip-integrated microcombs, frequency combs generated in micron-scale resonators, has revolutionized this landscape, enabling fully miniaturized, low-power clocks that bridge optical a…

🎰 Blinding lights: The hidden science behind gambling's glow
#gambling

Blinding lights: The hidden science behind gambling's glow
There's a reason casinos rarely have windows or clocks, they're engineered to make you lose track of time. But what if it's not just time you're losing? New research suggests that the lighting used in gambling environments could be quietly altering how we make decisions, making us more prone to take risks.

Multi-point local time penalizations with various clocks for one-dimensional L\'{e}vy processes
Kohki Iba
https://arxiv.org/abs/2507.00457 https://

Multi-point local time penalizations with various clocks for one-dimensional Lévy processes
We study the penalization problem with various clocks where the weight is given as the exponential functional of multi-point local times for one-dimensional Lévy processes. The limit processes may vary according to the choice of random clock, and are singular to the original process.

#PhantastikPrompts 02.08.2025: What were your favorite stories as a child?
Many. But high on the list (in order of age suitability) were
A. A. Milne's Winnie the Pooh and sequels;
James Thurber's The Thirteen Clocks;
John Masefield's Midnight Folk and The Box of Delights;
Alan Garner's Weirdstone of Brisingamen and sequels;
anything by…

Ok a little pet peeve about Roman numerals on watches and clocks.
I regularly read "smart" comments on watch related Reddit threads and watch reviews that state that dials on some watches are misprinting the 4 as IIII, rather than IV. Maybe this is some long running joke but in case it is not, let me point out that the people saying this are actually the ones who are wrong. The use of IIII is intentional.

'22 MPH at 260 pounds': Former Cowboys' 2nd-round pick on fast track to return from injury https://cowboyswire.usatoday.com/story/sports/nfl/cowboys/2025/07/25/cowboys-de-sam-williams-clo…

Effects of Small-Chain Superexchange Dynamics on Spin-Orbit Coupled Clock Spectroscopy
Mikhail Mamaev, Ana Maria Rey, William R. Milner
https://arxiv.org/abs/2507.11433

Effects of Small-Chain Superexchange Dynamics on Spin-Orbit Coupled Clock Spectroscopy
Optical lattice clocks have set records in clock precision and accuracy. Continuing to advance their performance, via probing as many atoms for the longest interrogation time affordable, requires experimentally and theoretically studying a many-body lattice system. Motivated by recent experimental results on a Fermi-degenerate three-dimensional optical lattice clock, we present a theoretical overview of Ramsey and Rabi spectroscopy in one-dimensional chains. At realistic experimental temperatur…

Finally got the x25519 accelerator to build for a Trion T20 (with REGFILE_OUT_REG=1, MULT_AREA_OPT=2).
It's pretty full (12356 / 19728 LE, 112/204 RAM, 34/36 mult), but fits. Fmax in C4 speed grade is 97.8 MHz and one crypto_scalarmult takes 756703 clocks which comes out to 7.73 ms. A scalarbase() is slightly slower but I don't have that number handy right now.
I'm not sure how practically useful this config is, because the FPGA is 62% full logic wise so I can't c…

A comparative study of time on Mars with lunar and terrestrial clocks
Neil Ashby, Bijunath R. Patla
https://arxiv.org/abs/2507.21388 https://arxiv.org/pdf/…

A comparative study of time on Mars with lunar and terrestrial clocks
As space exploration extends into cislunar space and further towards Mars, understanding the relativistic effects on clocks on Mars, particularly in relation to multibody gravitational influences, becomes increasingly important for accurate clock synchronization. This study estimates clock rates on Mars and compares them to those on the Moon and Earth. We find that, on average, clocks on Mars tick faster than those on the Earth's geoid by 477 microseconds per day, with a variation of 226 micros…

Highly efficient nuclear population transfer through physics-informed neural networks
Jing Liu, Fu-Quan Dou
https://arxiv.org/abs/2508.11546 https://arxiv.…

Highly efficient nuclear population transfer through physics-informed neural networks
Nuclear coherent population transfer (NCPT) offers numerous potential applications, particularly in next-generation nuclear clocks and nuclear batteries. However, the realization of high fidelity, fast operation, and low energy consumption in NCPT remains so far challenging. Here, we employ physics-informed neural networks (PINNs) to the population transfer in an open three-level nuclear system with spontaneous emission. The method embeds the system's control equations and boundary conditions i…

This https://arxiv.org/abs/2503.17248 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Einstein's Cat -- A Thought Experiment Against Anti-Relativist Claims
When faced with overwhelming evidence supporting the reality of time dilation, confirmed in particular by the Hafele-Keating experiment, some anti-relativists reluctantly concede that time dilation applies to light clocks. However, they argue that the Theory of Relativity remains flawed, claiming that time dilation applies to light clocks only, not to massive objects. They assert that atomic clocks, which operate based on microwave radiation, merely create the illusion that the Hafele-Keating e…

Deciding the Value of Two-Clock Almost Non-Zeno Weighted Timed Games
Isa Vialard
https://arxiv.org/abs/2508.00014 https://arxiv.org/pdf/2508.00014

Deciding the Value of Two-Clock Almost Non-Zeno Weighted Timed Games
The Value Problem for weighted timed games (wtgs) consists in determining, given a two-player weighted timed game with a reachability objective and a rational threshold, whether or not the value of the game exceeds the threshold. When restrained to wtgs with non-negative weight, this problem is known to be undecidable for weighted timed games with three or more clocks, and decidable for one-clock wtgs. The Value Problem for two-clock non-negative wtgs, which remained stubbornly open for a decad…

Exploiting complex 3D-printed surface structures for portable quantum technologies
Nathan Cooper, David Johnson, Benjamin Hopton, Matthew Overton, David Stupple, Alexandra Bratu, Edward Wilson, John Robinson, Laurence Coles, Manolis Papastavrou, Lucia Hackermueller
https://arxiv.org/abs/2507.01476

Exploiting complex 3D-printed surface structures for portable quantum technologies
Portable quantum technologies require robust, lightweight apparatus with superior performance. For techniques dependent upon high-vacuum environments, such as atom interferometers and atomic clocks, 3D-printing enables new avenues to tailor in-vacuum gas propagation dynamics. We demonstrate intricate, fine-scale surface patterning of 3D-printed vacuum components to increase the rate at which gas particles collide with the surface. By applying a non-evaporable getter coating for use as a surface…

Kalpa clocks in at around 930Mb for a Wayland KDE 6.3.4 session. That's neatly low. I think htop, fastfetch, git and mc should be included in the main image, as should Okular and Gwenview be (although they are available as a flatpak). The inclusion of Falkon ootb is amusing at best; I know no one who uses that browser. And Firefox is installed as a Flatpak, so why bother.
Anyway a solid, fully functional but minimal spin. As I like it 😎

Replaced article(s) found for math.CO. https://arxiv.org/list/math.CO/new
[1/1]:
- Clocks are $e$-positive
L. Chen, Y. T. He, David G. L. Wang
https://

'22 MPH at 260 pounds': Former Cowboys' 2nd-round pick on fast track to return from injury https://cowboyswire.usatoday.com/story/sports/nfl/cowboys/2025/07/25/cowboys-de-sam-williams-clo…

MmBack: Clock-free Multi-Sensor Backscatter with Synchronous Acquisition and Multiplexing
Yijie Li, Weichong Ling, Taiting Lu, Yi-Chao Chen, Vaishnavi Ranganathan, Lili Qiu, Jingxian Wang
https://arxiv.org/abs/2507.01360

MmBack: Clock-free Multi-Sensor Backscatter with Synchronous Acquisition and Multiplexing
Backscatter tags provide a low-power solution for sensor applications, yet many real-world scenarios require multiple sensors-often of different types-for complex sensing tasks. However, existing designs support only a single sensor per tag, increasing spatial overhead. State-of-the-art approaches to multiplexing multiple sensor streams on a single tag rely on onboard clocks or multiple modulation chains, which add cost, enlarge form factor, and remain prone to timing drift-disrupting synchroni…

Stereo Reproduction in the Presence of Sample Rate Offsets
Srikanth Korse, Andreas Walther, Emanuel A. P. Habets
https://arxiv.org/abs/2507.05402 https://

Stereo Reproduction in the Presence of Sample Rate Offsets
One of the main challenges in synchronizing wirelessly connected loudspeakers for spatial audio reproduction is clock skew. Clock skew arises from sample rate offsets ( SROs) between the loudspeakers, caused by the use of independent device clocks. While network-based protocols like Precision Time Protocol (PTP) and Network Time Protocol (NTP) are explored, the impact of SROs on spatial audio reproduction and its perceptual consequences remains underexplored. We propose an audio-domain SRO comp…

Muochrony: Exploring Time and Frequency Applications of Cosmic Muons
G. Cerretto, E. Cantoni, M. Sellone, C. E. Calosso, I. Gnesi, H. K. M. Tanaka
https://arxiv.org/abs/2505.24606

Muochrony: Exploring Time and Frequency Applications of Cosmic Muons
This study outlines the progress of a collaborative effort between INRIM and MUOGRAPHIX-The University of Tokyo, focusing on using muons from cosmic-ray-induced Extensive Air Showers (EAS) to synchronize atomic clocks and disseminate atomic time references. The approach, known as the Cosmic Time Synchronizer (CTS), proposed by the University of Tokyo, serves as the foundation for a new field of study called Muochrony. The paper details the CTS technology, underlying principles, and the prototyp…

Atomic thermometry in optical lattice clocks
Irene Goti, Tommaso Petrucciani, Stefano Condio, Filippo Levi, Davide Calonico, Marco Pizzocaro
https://arxiv.org/abs/2508.08164 htt…

Visible Brillouin-quadratic microlaser in a high-Q thin-film lithium niobate microdisk
Xiaochao Luo, Chuntao Li, Xingzhao Huang, Jintian Lin, Renhong Gao, Yifei Yao, Yingnuo Qiu, Yixuan Yang, Lei Wang, Huakang Yu, Ya Cheng
https://arxiv.org/abs/2506.08615

Visible Brillouin-quadratic microlaser in a high-Q thin-film lithium niobate microdisk
Narrow-linewidth lasers at short/visible wavelengths are crucial for quantum and atomic applications, such as atomic clocks, quantum computing, atomic and molecular spectroscopy, and quantum sensing. However, such lasers are often only accessible in bulky tabletop systems and remain scarce in integrated photonic platform. Here, we report an on-chip visible Brillouin-quadratic microlaser in a 117-um-diameter thin-film lithium niobate (TFLN) microdisk via dispersion engineering. Enabled by the ul…

Continuous operation of a coherent 3,000-qubit system
Neng-Chun Chiu, Elias C. Trapp, Jinen Guo, Mohamed H. Abobeih, Luke M. Stewart, Simon Hollerith, Pavel Stroganov, Marcin Kalinowski, Alexandra A. Geim, Simon J. Evered, Sophie H. Li, Lisa M. Peters, Dolev Bluvstein, Tout T. Wang, Markus Greiner, Vladan Vuleti\'c, Mikhail D. Lukin
https://

Continuous operation of a coherent 3,000-qubit system
Neutral atoms are a promising platform for quantum science, enabling advances in areas ranging from quantum simulations and computation to metrology, atomic clocks and quantum networking. While atom losses typically limit these systems to a pulsed mode, continuous operation could significantly enhance cycle rates, remove bottlenecks in metrology, and enable deep-circuit quantum evolution through quantum error correction. Here we demonstrate an experimental architecture for high-rate, continuous…

Visualization of nonlinear optics in a microresonator
Hao Zhang, Haochen Yan, Alekhya Ghosh, Shuangyou Zhang, Toby Bi, Yaojing Zhang, Lewis Hill, Jolly Xavier, Arghadeep Pal, Yongyong Zhuang, Jijun He, Shilong Pan, Pascal DelHaye
https://arxiv.org/abs/2507.05450

Visualization of nonlinear optics in a microresonator
A precise understanding of nonlinear optical phenomena in whispering gallery mode (WGM) microresonators is crucial for developing next-generation integrated photonic devices. Applications include on-chip sensors for biomedical use, optical memories for all-optical networks and frequency combs for optical clocks. However, our ability to spatially localize nonlinear optical processes within microresonators has been limited because optical feedback is often only collected through a bus waveguide. …

Strong Mitigation of the Magnetic-Field-Induced Frequency Shift in Coherent-Population-Trapping Atomic Clocks
Denis Brazhnikov, Vladislav Vishnyakov, Mikhail Skvortsov
https://arxiv.org/abs/2506.05865

Cyclicity of interaction frame transformations
Michael C D Tayler, Mohamed Sabba
https://arxiv.org/abs/2506.20594 https://arxiv.org/p…

Cyclicity of interaction frame transformations
We identify a cyclic property of rotation sequences involving piecewise displacements $β$ about arbitrary axes in three dimensions. Specifically, when transformation to the toggling frame is applied successively $m$ times, for $β=2π/m$ the original sequence returns. This main result unites several families of rotation sequences used for error-tuned control across quantum technologies, from NMR and MRI to atomic clocks and atom-scale computing. For the widest class of cycle, $m=2$, we highlig…

Octave Spanning Visible to SWIR Integrated Coil-Stabilized Brillouin Lasers
Meiting Song, Nitesh Chauhan, Mark W. Harrington, Nick Montifiore, Kaikai Liu, Andrew S. Hunter, Chris Caron, Andrei Isichenko, Robert J. Niffenegger, Daniel J. Blumenthal
https://arxiv.org/abs/2508.03036

Octave Spanning Visible to SWIR Integrated Coil-Stabilized Brillouin Lasers
Narrow linewidth stabilized lasers are central to precision applications that operate across the visible to short-wave infrared wavelengths, including optical clocks, quantum sensing and computing, ultra-low noise microwave generation, and fiber sensing. Today, these spectrally pure sources are realized using multiple external cavity tabletop lasers locked to bulk-optic free-space reference cavities. Integration of this technology will enable portable precision applications with improved reliab…

Frequency reproducibility of solid-state Th-229 nuclear clocks
Tian Ooi, Jack F. Doyle, Chuankun Zhang, Jacob S. Higgins, Jun Ye, Kjeld Beeks, Tomas Sikorsky, Thorsten Schumm
https://arxiv.org/abs/2507.01180

Narrow-linewidth, piezoelectrically tunable photonic integrated blue laser
Anat Siddharth, Asger B. Gardner, Xinru Ji, Shivaprasad U. Hulyal, Mikael S. Reichler, Alaina Attanasio, Johann Riemensberger, Sunil A. Bhave, Nicolas Volet, Simone Bianconi, Tobias J. Kippenberg
https://arxiv.org/abs/2508.02568…

Narrow-linewidth, piezoelectrically tunable photonic integrated blue laser
Frequency-agile lasers operating in the ultraviolet-to-blue spectral range (360-480 nm) are critical enablers for a wide range of technologies, including free-space and underwater optical communications, optical atomic clocks, and Rydberg-atom-based quantum computing platforms. Integrated photonic lasers offer a compelling platform for these applications by combining low-noise performance with fast frequency tuning in a compact, robust form factor through monolithic integration. However, realiz…