Half-minute-scale atomic coherence and high relative stability in a tweezer clock

AW Young, WJ Eckner, WR Milner, D Kedar, MA Norcia… - Nature, 2020‏ - nature.com
The preparation of large, low-entropy, highly coherent ensembles of identical quantum
systems is fundamental for many studies in quantum metrology, simulation and information …

Prospects and challenges for squeezing-enhanced optical atomic clocks

M Schulte, C Lisdat, PO Schmidt, U Sterr… - Nature …, 2020‏ - nature.com
Optical 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 …

An atomic-array optical clock with single-atom readout

IS Madjarov, A Cooper, AL Shaw, JP Covey… - Physical Review X, 2019‏ - APS
Currently, the most accurate and stable clocks use optical interrogation of either a single ion
or an ensemble of neutral atoms confined in an optical lattice. Here, we demonstrate a new …

176Lu+ clock comparison at the 10−18 level via correlation spectroscopy

Z Zhiqiang, KJ Arnold, R Kaewuam, MD Barrett - Science Advances, 2023‏ - science.org
The extreme precision of optical atomic clocks has led to an anticipated redefinition of the
second by the International System of Units. Furthermore, accuracies pushing the boundary …

Direct detection of ultralight dark matter bound to the Sun with space quantum sensors

YD Tsai, J Eby, MS Safronova - Nature Astronomy, 2023‏ - nature.com
Recent advances in quantum sensors, including atomic clocks, enable searches for a broad
range of dark matter candidates. The question of the dark matter distribution in the Solar …

[HTML][HTML] Entanglement-enhanced optical atomic clocks

S Colombo, E Pedrozo-Peñafiel, V Vuletić - Applied Physics Letters, 2022‏ - pubs.aip.org
Recent developments in atomic physics have enabled the experimental generation of many-
body entangled states to boost the performance of quantum sensors beyond the Standard …

Evaluation of a Optical Clock with a Direct Measurement of the Blackbody Radiation Shift and Determination of the Clock Frequency

M Steinel, H Shao, M Filzinger, B Lipphardt… - Physical Review Letters, 2023‏ - APS
We report on an evaluation of an optical clock that uses the S 2 1/2→ D 2 5/2 transition of a
single Sr+ 88 ion as the reference. In contrast to previous work, we estimate the effective …

Lifetime-Limited Interrogation of Two Independent Clocks Using Correlation Spectroscopy

ER Clements, ME Kim, K Cui, AM Hankin, SM Brewer… - Physical review …, 2020‏ - APS
Laser decoherence limits the stability of optical clocks by broadening the observable
resonance linewidths and adding noise during the dead time between clock probes …

Direct observation of ion micromotion in a linear Paul trap

LA Zhukas, MJ Millican, P Svihra, A Nomerotski… - Physical Review A, 2021‏ - APS
In this paper, direct observation of micromotion for multiple ions in a laser-cooled trapped
ion crystal is discussed along with a measurement technique for micromotion amplitude …

Prospects of a Ion Clock

K Beloy - Physical review letters, 2021‏ - APS
We propose a high-performance atomic clock based on the 1.81 PHz transition between the
ground and first-excited state of doubly ionized lead. Utilizing an even isotope of lead, both …