Development of a Portable Optical Clock

Morris, David C.; Aldous, Matthew; Gellesch, Markus; Jones, John Anthony; Kale, Y. B.; Singh, Alok; Bass, Jonathan; Bongs, Kai; Singh, Yeshpal; Hill, Ian R.; Hendricks, Richard; Gaynor, Paul D.; Gill, P.; Williams, Ross

doi:10.1109/fcs.2019.8856051

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Indeed, work is underway worldwide to produce systems that are sufficiently compact and robust to be operated outside the metrology laboratory. Some of the systems demonstrated so far utilize vapors such as molecular iodine [8] or atomic rubidium [9][10][11][12][13][14]; others utilize laser cooling and trapping of neutral atoms [3,[15][16][17] or single ions [18,19]. A key enabler has been the increasing availability of optical frequency combs, which are leveraged in all optical clocks to coherently down-convert the high-frequency optical signals to the RF domain [20,21].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Optical Rubidium Clock Frequency Spanning 65 Days

Lemke

Martin

Beard

et al. 2022

Sensors

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Optical clocks are emerging as next-generation timekeeping devices with technological and scientific use cases. Simplified atomic sources such as vapor cells may offer a straightforward path to field use, but suffer from long-term frequency drifts and environmental sensitivities. Here, we measure a laboratory optical clock based on warm rubidium atoms and find low levels of drift on the month-long timescale. We observe and quantify helium contamination inside the glass vapor cell by gradually removing the helium via a vacuum apparatus. We quantify a drift rate of 4×10−15/day, a 10 day Allan deviation less than 5×10−15, and an absolute frequency of the Rb-87 two-photon clock transition of 385,284,566,371,190(1970) Hz. These results support the premise that optical vapor cell clocks will be able to meet future technology needs in navigation and communications as sensors of time and frequency.

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Section: Introductionmentioning

confidence: 99%

Measurement of Optical Rubidium Clock Frequency Spanning 65 Days

Lemke

Martin

Beard

et al. 2022

Sensors

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Transportable optical atomic clocks for use in out-of-the-lab environments

Gellesch

Jones

Barron

et al. 2019

Advanced Optical Technologies

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Recently, several reports with a strong focus on compact, nonstationary optical atomic clocks have been published, including accounts of in-field deployment of these devices for demonstrations of chronometric levelling in different types of environments. We review recent progress in this research area, comprising compact and transportable neutral atom and single-ion optical atomic clocks. The identified transportable optical clocks strive for low volume, weight and power consumption while exceeding standard microwave atomic clocks in fractional frequency instability and systematic uncertainty. Some transportable clock projects additionally address requirements for metrology or serve the joint technology development between industrial and academic stakeholders. Based on the reviewed reports on nonstationary optical atomic clocks, we suggest definitions for transportable, portable and mobile optical atomic clocks. We conclude our article with an overview of possible future directions for developments of optical clock technology.

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Indigenisation of the Quantum Clock: An Indispensable Tool for Modern Technologies

Sharma

2023

Atoms

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Time and frequency (T&F) measurement with unprecedented accuracy is the backbone for several sophisticated technologies, commensurate with the evolution of human civilisation in the 20th century in terms of communication, positioning, navigation, and precision timing. This necessity drove researchers in the early 1950s to build atomic clocks that have now evolved to a state-of-the-art level, operating at optical wavelengths as optical atomic clocks, which use cold and trapped samples of atomic/ionic species and various other sophisticated diagnostic test techniques. Such ultrahigh-precision accurate clocks have made it possible to probe fundamental aspects of science through incredibly sensitive measurements. On the other hand, they meet the T&F synchronisation standards for classical and emerging quantum technologies at the desired level of accuracy. Considering the impact of optical atomic clocks in the second quantum revolution (quantum 2.0), they have been identified as an indispensable critical technology in worldwide quantum missions, including in India. This article reviews the present international scenario regarding optical atomic clocks and their related technologies and draws a roadmap for their indigenisation over the next decade.

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Development of a Portable Optical Clock

Cited by 3 publications

References 7 publications

Measurement of Optical Rubidium Clock Frequency Spanning 65 Days

Measurement of Optical Rubidium Clock Frequency Spanning 65 Days

Transportable optical atomic clocks for use in out-of-the-lab environments

Indigenisation of the Quantum Clock: An Indispensable Tool for Modern Technologies

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