scholarly journals Extracting dark matter signatures from atomic clock stability measurements

2017 ◽  
Vol 96 (7) ◽  
Author(s):  
Tigran Kalaydzhyan ◽  
Nan Yu
Keyword(s):  
Dark Matter ◽  
Atomic Clock ◽  
Clock Stability ◽  
Stability Measurements

Dark matter searches within the intercontinental optical atomic clock network

2018 ◽  
Author(s):  
P. Wcislo ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Atomic Clock ◽  
Clock Network

scholarly journals New bounds on dark matter coupling from a global network of optical atomic clocks

2018 ◽  
Vol 4 (12) ◽  
pp. eaau4869 ◽  
Author(s):  
P. Wcisło ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Cold Atoms ◽  
Atomic Clock ◽  
Structure Constant ◽  
Global Network ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Massive Scalar Field ◽  
Transient Variations

We report on the first Earth-scale quantum sensor network based on optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in the susceptibilities to the fine-structure constant of essential parts of an optical atomic clock, i.e., the cold atoms and the optical reference cavity, we can perform sensitive searches for DM signatures without the need for real-time comparisons of the clocks. We report a two orders of magnitude improvement in constraints on transient variations of the fine-structure constant, which considerably improves the detection limit for the standard model (SM)–DM coupling. We use Yb and Sr optical atomic clocks at four laboratories on three continents to search for both topological defect and massive scalar field candidates. No signal consistent with a DM coupling is identified, leading to considerably improved constraints on the DM-SM couplings.

scholarly journals Prospects and challenges for squeezing-enhanced optical atomic clocks

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Marius Schulte ◽  
Christian Lisdat ◽  
Piet O. Schmidt ◽  
Uwe Sterr ◽  
Klemens Hammerer
Keyword(s):  
Dead Time ◽  
Atomic Clock ◽  
Frequency Noise ◽  
Squeezed States ◽  
Atomic Clocks ◽  
Atom Number ◽  
Order Of Magnitude ◽  
Clock Stability ◽  
Servo Loop ◽  
The Stability

AbstractOptical atomic clocks are a driving force for precision measurements due to the high accuracy and stability demonstrated in recent years. While further improvements to the stability have been envisioned by using entangled atoms, squeezing the quantum mechanical projection noise, evaluating the overall gain must incorporate essential features of an atomic clock. Here, we investigate the benefits of spin squeezed states for clocks operated with typical Brownian frequency noise-limited laser sources. Based on an analytic model of the closed servo-loop of an optical atomic clock, we report here quantitative predictions on the optimal clock stability for a given dead time and laser noise. Our analytic predictions are in good agreement with numerical simulations of the closed servo-loop. We find that for usual cyclic Ramsey interrogation of single atomic ensembles with dead time, even with the current most stable lasers spin squeezing can only improve the clock stability for ensembles below a critical atom number of about one thousand in an optical Sr lattice clock. Even with a future improvement of the laser performance by one order of magnitude the critical atom number still remains below 100,000. In contrast, clocks based on smaller, non-scalable ensembles, such as ion clocks, can already benefit from squeezed states with current clock lasers.

Different Variances Used for Analyzing the Noise Type of Atomic Clock

2012 ◽  
Vol 229-231 ◽  
pp. 1980-1983 ◽  
Author(s):  
Jing Zhai ◽  
Lian Dong ◽  
Shu Sheng Zhang ◽  
Fu Min Lu ◽  
Li Zhi Hu
Keyword(s):  
Spectral Density ◽  
Density Function ◽  
Random Noise ◽  
Atomic Clock ◽  
Spectral Density Function ◽  
Random Factor ◽  
Noise Type ◽  
Clock Stability ◽  
Degree Of Confidence

Stability is an important factor to measure the quality of an atomic clock. The random factor that affects atomic clock includes five kinds of noise. The random noise can be expressed by spectral density function. In a certain smooth time, only one or two types of noise can influence the atomic clock’s stability. Through the relationship between spectral density function and atomic clock stability analysis variance, such as Allan variance, it’s possible to distinguish the kind of noise on different smooth time. When lacking of data, there is a way that can increase the amount of data by mapping extensions, and it can also improve the degree of confidence in the larger smooth time.

scholarly journals ELECTRON ELECTRIC DIPOLE MOMENT EXPERIMENT WITH SLOW ATOMS

2007 ◽  
Vol 16 (12b) ◽  
pp. 2337-2342 ◽  
Author(s):  
HARVEY GOULD
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Standard Model ◽  
Neutrino Mass ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Atomic Clock ◽  
New Physics ◽  
The Standard Model ◽  
Electron Electric Dipole Moment

Discovering an electron electric dipole moment (e-EDM) would uncover new physics requiring an extension of the Standard Model. e-EDMs, large enough to be discovered by new experiments are now common predictions in extensions of the Standard Model, including extensions that describe baryogenesis, dark matter, and neutrino mass. A cesium slow-atom e-EDM experiment (which is similar to an atomic clock) can improve the sensitivity to the e-EDM. And, as with an atomic clock, it could be more sensitive in microgravity than on Earth. As a first step an Earth-based demonstration Cs fountain e-EDM experiment has been carried out at LBNL.

scholarly journals The local dark sector

2021 ◽  
Author(s):  
Joel Bergé ◽  
Laura Baudis ◽  
Philippe Brax ◽  
Sheng-Wey Chiow ◽  
Bruno Christophe ◽  
...  
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Dark Energy ◽  
Solar System ◽  
Gravitational Potential ◽  
Atomic Clock ◽  
Dark Sector ◽  
New Knowledge ◽  
Near Future

AbstractWe speculate on the development and availability of new innovative propulsion techniques in the 2040s, that will allow us to fly a spacecraft outside the Solar System (at 150 AU and more) in a reasonable amount of time, in order to directly probe our (gravitational) Solar System neighborhood and answer pressing questions regarding the dark sector (dark energy and dark matter). We identify two closely related main science goals, as well as secondary objectives that could be fulfilled by a mission dedicated to probing the local dark sector: (i) begin the exploration of gravitation’s low-acceleration regime with a spacecraft and (ii) improve our knowledge of the local dark matter and baryon densities. Those questions can be answered by directly measuring the gravitational potential with an atomic clock on-board a spacecraft on an outbound Solar System orbit, and by comparing the spacecraft’s trajectory with that predicted by General Relativity through the combination of ranging data and the in-situ measurement (and correction) of non-gravitational accelerations with an on-board accelerometer. Despite a wealth of new experiments getting online in the near future, that will bring new knowledge about the dark sector, it is very unlikely that those science questions will be closed in the next two decades. More importantly, it is likely that it will be even more urgent than currently to answer them. Tracking a spacecraft carrying a clock and an accelerometer as it leaves the Solar System may well be the easiest and fastest way to directly probe our dark environment.

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