Resilient timekeeping algorithm with multi-observation fusion Kalman filter by Xiaobin Wang, Yuanxi Yang, Bo Wang, Yuting Lin, Chunhao Han

“…This algorithm fuses the frequency measurements from hydrogen masers with various reference frequency standards, including PFS and commercial cesium beam atomic clocks. The simulation results show that the time deviation and instability of the timescale generated by MFKF are improved compared to those with Kalman filtering. …”
Get full text

Sideband Thermometry of Ion Crystals by Ivan Vybornyi, Laura S. Dreissen, Dominik Kiesenhofer, Helene Hainzer, Matthias Bock, Tuomas Ollikainen, Daniel Vadlejch, Christian F. Roos, Tanja E. Mehlstäubler, Klemens Hammerer

“…Coulomb crystals of cold trapped ions are a leading platform for the realization of quantum processors and quantum simulations and, in quantum metrology, for the construction of optical atomic clocks and for fundamental tests of the standard model. …”
Get full text

Ramsey interferometry with cold atoms in coherent population trapping by Chengyin Han, Bo Lu, Chaohong Lee

“…Particularly, high-resolution CPT-Ramsey spectroscopy of alkali-metal atoms has found extensive application in constructing miniaturized quantum sensors like atomic magnetometers and atomic clocks. Due to their well-defined environment and extended coherence time, cold atoms offer enhanced sensitivity and precision in CPT-Ramsey interferometry. …”
Get full text

Evading Quantum Mechanics: Engineering a Classical Subsystem within a Quantum Environment by Mankei Tsang, Carlton M. Caves

“…Quantum mechanics is potentially advantageous for certain information-processing tasks, but its probabilistic nature and requirement of measurement backaction often limit the precision of conventional classical information-processing devices, such as sensors and atomic clocks. Here we show that, by engineering the dynamics of coupled quantum systems, it is possible to construct a subsystem that evades the measurement backaction of quantum mechanics, at all times of interest, and obeys any classical dynamics, linear or nonlinear, that we choose. …”
Get full text

Quantum metrology with cold atomic ensembles by Mitchell Morgan W., Sewell R. J., Napolitano M., Koschorreck M., Dubost B., Behbood N., Kubasik M.

“…Long established as a valuable technique in optical measurements such as gravitational-wave detection, quantum metrology is increasingly being applied to atomic instruments such as matter-wave interferometers, atomic clocks, and atomic magnetometers. Several of these new applications involve dual optical/atomic quantum systems, presenting both new challenges and new opportunities. …”
Get full text

On the Possibility of Experimental Detection of the Discreteness of Time by Marios Christodoulou, Carlo Rovelli, Carlo Rovelli

“…We point out that: (i) in relativistic language, the experiment tests an interference effect between proper-time intervals; (ii) the feasibility study by Bose et al. suggests that current technology could allow to probe differences of such proper-time intervals of the order of 10−38 seconds, about twenty orders of magnitude beyond the current resolution of the best atomic clocks; (iii) the difference of proper times approaches Planck time (10−44 s) if the masses of the particles in the experiment approach the Planck mass (~micrograms). …”
Get full text

A new method for quantitative and qualitative representation of the noises type in Allan (and related) variances by Kamil Maciuk, Jacek Kudrys, Mohammad Bagherbandi, Igor V. Bezmenov

“…This method is one of the most popular for identifying different noise types in the sensors data, and it is usually used for a wide range of studies on the stability of oscillators or atomic clocks. In this paper, the authors propose their own algorithm for a qualitative and quantitative expression of noise type using Allan and related variation. …”
Get full text

Explanation of What Time in Kinematics Is and Dispelling Myths Allegedly Stemming from the Special Theory of Relativity by Roman Szostek

“…The presented model shows how, using atomic clocks, it may be possible to determine the movement in relation to the universal frame of reference in which electromagnetic signals propagate. …”
Get full text

Quantum time dilation in a gravitational field by Jerzy Paczos, Kacper Dębski, Piotr T. Grochowski, Alexander R. H. Smith, Andrzej Dragan

“…We demonstrate that this nonclassical effect also manifests in a fractional frequency shift of the internal energy of the atom that is within the resolution of current atomic clocks. In addition, we show the effect of spatial coherence on the atom's emission spectrum.…”
Get full text

Limits and prospects for long-baseline optical fiber interferometry by Hilweg, Christopher, Shadmany, Danial, Walther, Philip, Mavalvala, Nergis, Sudhir, Vivishek

“…Today’s most precise optical instruments—gravitational-wave interferometers and optical atomic clocks—rely on long storage times for photons to realize their exquisite sensitivity. …”
Get full text

Femtosecond-Level Frequency Transfer at 10 GHz over Long Fiber Link with Optical–Electronic Joint Compensation by Wantao Huang, Yang Li, Peng Zhang, Lujun Fang, Dong Hou

“…The technique proposed in this paper provides a powerful tool which can be used to transfer atomic clocks (e.g., commercial H-master and Cs clocks) in a long fiber link.…”
Get full text

Ultra-stable optical clock cavities as resonant mass gravitational wave detectors in search for new physics by M. Narożnik, M. Bober, M. Zawada

“…We propose using table-top-size ultra-stable optical cavities from state-of-the-art optical atomic clocks as bar gravitational wave detectors for frequencies higher than 2 kHz. …”
Get full text

Laser, Offspring and Powerful Enabler of Quantum Science by Serge Haroche

“…Nuclear magnetic resonance, atomic clocks, optical pumping, and masers followed and the pace of discoveries accelerated with the appearance of the laser in 1960. …”
Get full text

Underwater Positioning System Based on Drifting Buoys and Acoustic Modems by Pablo Otero, Álvaro Hernández-Romero, Miguel-Ángel Luque-Nieto, Alfonso Ariza

“…The system is hyperbolic, i.e., based on time differences and it does not need very accurate atomic clocks to synchronize repeaters. The system architecture and system calculations that demonstrate the feasibility of the solution are presented. …”
Get full text

A lab-based test of the gravitational redshift with a miniature clock network by Xin Zheng, Jonathan Dolde, Matthew C. Cambria, Hong Ming Lim, Shimon Kolkowitz

“…These results highlight the potential of local-oscillator-independent differential clock comparisons for emerging applications of optical atomic clocks including geodesy, searches for new physics, gravitational wave detection, and explorations of the interplay between quantum mechanics and gravity.…”
Get full text

A small weak scale from a small cosmological constant by Asimina Arvanitaki, Savas Dimopoulos, Victor Gorbenko, Junwu Huang, Ken Van Tilburg

“…At low energies, the radion necessarily appears as an unnaturally light scalar, in a range of masses and couplings accessible to fifth-force searches as well as scalar dark matter searches with atomic clocks and gravitational-wave detectors. The fermion sector that controls the size of the extra dimension consists of a pair of electroweak doublets and several singlets. …”
Get full text

Technologies of Romance: Mineralogy: a digital account by Lee Mackinnon

“…Minerals are traced through a number of modern technologies including matches, atomic clocks and mobile devices, all of which evoke alchemical transformation and spectacle. …”
Get full text

Spin-squeezing of ⁸⁷Rb via optical measurement by Schwab, Adele Ann

Get full text

Multi-site integrated optical addressing of trapped ions by Joonhyuk Kwon, William J. Setzer, Michael Gehl, Nicholas Karl, Jay Van Der Wall, Ryan Law, Matthew G. Blain, Daniel Stick, Hayden J. McGuinness

“…This work represents an important step towards the realization of scalable integrated photonics for atomic clocks and trapped-ion quantum information systems.…”
Get full text

State-Insensitive Trapping of Alkaline-Earth Atoms in a Nanofiber-Based Optical Dipole Trap by G. Kestler, K. Ton, D. Filin, C. Cheung, P. Schneeweiss, T. Hoinkes, J. Volz, M.S. Safronova, A. Rauschenbeutel, J.T. Barreiro

“…Alkaline-earth atoms also exhibit nonmagnetic ground states and ultranarrow linewidth transitions making them ideal candidates for atomic clocks and precision metrology applications, especially with state-insensitive traps. …”
Get full text