Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Performance of a 3 cc Yb+ trap as a microwave clock after 10 years

Daniel Thrasher, Peter D. D. Schwindt, Erik Skogen, Seth A. Fortuna, Charles R. Alford, Michael John Smith, Ganapathi Subramania, Joshua Mondragon, Eduardo Garcia, A. Rice, Yuan‐Yu Jau

Published May 1, 2023• 0 citations
Publisher

Abstract

We describe the performance of several miniature buffer-gas-cooled Yb ion radio frequency Paul traps that were sealed in 2012 and 2018.The ground state hyperfine splitting of each trapped ion ensemble is interrogated and used to correct a local oscillator forming two clocks.We also describe progress towards demonstrating a novel 369 nm edge emitting diode laser.

DOI
10.2172/2431332

Related papers

Performance of 3 cm3 ion trap vacuum package sealed for 10 years

Daniel Thrasher, Peter D. D. Schwindt

Miniature atomic clocks based on the interrogation of the ground state hyperfine splitting of buffer gas cooled ions confined in radio frequency Paul traps have shown great promise as high precision prototype clocks. We report on the performance of two miniature ion trap vacuum packages after being sealed for as much as 10 years. We find the lifetime of the ions within the trap has increased over time for both traps and can be as long as 50 days. We form two clocks using the two traps and compare their relative frequency instability one with another to demonstrate a short-term instability of 5×10−13τ−1/2 integrating down to 1×10−14 after 2 ks of integration. The trapped ion lifetime and clock instability demonstrated by these miniature devices despite only being passively pumped for many years represents a critical advance toward their proliferation in the clock community.

Applied Physics Letters•Mar 1, 2025•3 citations

Miniature microwave frequency standard with trapped 171Yb+

Yuan‐Yu Jau, Peter D. D. Schwindt, Adrian L. Casias +12 more

We report the development of a low-power, miniature Yb-171 ion clock at Sandia National Laboratories. This work is funded by the DARPA micro Position, Navigation, and Timing program under the Integrated Micro Primary Atomic Clock Technology (IMPACT) project. The ultimate goal is to develop a frequency standard that has frequency stability comparable to a commercial Cs beam standard, but with 100 to 1000 times smaller size and power consumption. The Yb-171 ion has a microwave clock traItem MIN :YXB4-01335-A112nsition at 12.6 GHz, and the natural linewidth of the clock resonance is expected to be less than 10-3Hz, which leads to a very high-Q clock resonance. An atomic clock using trapped ions is an excellent candidate for miniaturization because ions are well isolated from the environment independently of the size of the trap. Compared to optical traps for neutral atoms, the trapping depth of RF traps for ions is usually several orders of magnitude deeper. Therefore, the requirement for the vacuum level is more forgiving. We have successfully developed miniature ion-trap vacuum packages as shown in Fig. 1. Usually, a few microTorr of He buffer gas is introduced into each of our miniature ion-trap vacuum packages, which are sealed and passively pumped by non-evaporable getters. Using a sealed 3 cc ion-trap package, we were able to demonstrate long-term clock operation, with the stability reaching the 10-14range after a few days of integration [1].

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•May 1, 2014•0 citations

Development of (Miniaturized) Trapped Yb Ion Clocks.

Peter D. D. Schwindt

Outline • Introduction• Why trapped ions for miniaturization?• Miniaturized vacuum package: 1 cm 3 • Pulsed-mode ion clock performance • F-state trapping • Current focus: microwave optical double resonance continuous operation • Alternative ion clock: Alkali Mediated Atomic Clock • Conclusion Miniaturization with Long-Term and Environmental Stability • Achieve Cs Beam Clock performance in a mass and power constrained package • DARPA programs: • IMPACT: improved long-term stability • ACES: improved environmental stability Applications--Excellent timing for: • Rapid GPS acquisition, and GPS denied navigation and timing • Nano/pico (cube) satellites • Pulsed radio and spread spectrum communications Microsemi 5071A Miniature primary frequency standard Approved for Public Release, Distribution Unlimited Critical Elements of the 171 Yb + Clock Trap Electrodes Ions Yb Source Vacuum Package Control and Power Electronics Local Oscillator Magnetic Shield and Coil Repump (935 nm) Optical Pumping/ State Detection Laser (369 nm) Beam Combiner Fluorescence Collection Lens Fluorescence Detector Photo Multiplier Tube (PMT) Ionization UV Light

•Dec 12, 2018•0 citations

Miniature trapped-ion frequency standard with 171Yb+

Peter D. D. Schwindt, Yuan‐Yu Jau, Heather L. Partner +14 more

We describe the development and frequency instability measurements of a highly miniaturized, buffer gas cooled, trapped-ion atomic clock. The clock utilizes the 12.6 GHz hyperfine transition of the171Yb+ion. A custom-built 3 cm3vacuum package containing the ion trap is integrated with other key elements of the atomic frequency standard, including a photo multiplier tube, miniaturized laser sources at 369 nm and 935 nm, a local oscillator, and control electronics. With the clock physics package assembled on a 10 cm × 15 cm breadboard, the long-term fractional frequency instability was measured to be 6 × 10-14at 25 days of integration. Later, the clock physics package was further miniaturized, and the frequency instability was measured to be 2 × 10-11/τ1/2at integration times up to 10,000 s.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Apr 1, 2015•11 citations

Low-power, miniature 171Yb ion clock using an ultra-small vacuum package

Yuan‐Yu Jau, Heather L. Partner, Peter D. D. Schwindt +3 more

We report a demonstration of a very small microwave atomic clock using the 12.6 GHz hyperfine transition of the trapped 171Yb ions inside a miniature, completely sealed-off 3 cm3 ion-trap vacuum package. In the ion clock system, all of the components are highly miniaturized with low power consumption except the 369 nm optical pumping laser still under development for miniaturization. The entire clock, including the control electronics, consumes <300 mW. The fractional frequency instability of the miniature Yb+ clock reaches the 10−14 range after a few days of integration.

Applied Physics Letters•Dec 17, 2012•37 citations

A Microwave Clock Based on Laser-Cooled 171 Yb + Ions

N. C. Xin, Jianwei Zhang, S. N. Miao +5 more

A microwave frequency standard based on laser-cooled171Yb+ions at Tsinghua University has been investigated. More than 105171Yb+ions were stably trapped for over 40 hours. The ground-state hyperfine splitting frequency of171Yb+was determined to be 12642812118.4672(8) Hz with a fractional frequency uncertainty of 6.33×10−14. Our work is in a continuous line with that of other scholars.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Apr 24, 2022•2 citations
We describe the performance of several miniature buffer-gas-cooled Yb ion radio frequency Paul traps that were sealed in 2012 and 2018.The ground state hyperfine splitting of each trapped ion ensemble is interrogated and used to correct a local oscillator forming two clocks.We also describe progress towards demonstrating a novel 369 nm edge emitting diode laser.
Miniature atomic clocks based on the interrogation of the ground state hyperfine splitting of buffer gas cooled ions confined in radio frequency Paul traps have shown great promise as high precision prototype clocks. We report on the performance of two miniature ion trap vacuum packages after being sealed for as much as 10 years. We find the lifetime of the ions within the trap has increased over time for both traps and can be as long as 50 days. We form two clocks using the two traps and compare their relative frequency instability one with another to demonstrate a short-term instability of 5×10−13τ−1/2 integrating down to 1×10−14 after 2 ks of integration. The trapped ion lifetime and clock instability demonstrated by these miniature devices despite only being passively pumped for many years represents a critical advance toward their proliferation in the clock community.
We report the development of a low-power, miniature Yb-171 ion clock at Sandia National Laboratories. This work is funded by the DARPA micro Position, Navigation, and Timing program under the Integrated Micro Primary Atomic Clock Technology (IMPACT) project. The ultimate goal is to develop a frequency standard that has frequency stability comparable to a commercial Cs beam standard, but with 100 to 1000 times smaller size and power consumption. The Yb-171 ion has a microwave clock traItem MIN :YXB4-01335-A112nsition at 12.6 GHz, and the natural linewidth of the clock resonance is expected to be less than 10-3Hz, which leads to a very high-Q clock resonance. An atomic clock using trapped ions is an excellent candidate for miniaturization because ions are well isolated from the environment independently of the size of the trap. Compared to optical traps for neutral atoms, the trapping depth of RF traps for ions is usually several orders of magnitude deeper. Therefore, the requirement for the vacuum level is more forgiving. We have successfully developed miniature ion-trap vacuum packages as shown in Fig. 1. Usually, a few microTorr of He buffer gas is introduced into each of our miniature ion-trap vacuum packages, which are sealed and passively pumped by non-evaporable getters. Using a sealed 3 cc ion-trap package, we were able to demonstrate long-term clock operation, with the stability reaching the 10-14range after a few days of integration [1].
Outline • Introduction• Why trapped ions for miniaturization?• Miniaturized vacuum package: 1 cm 3 • Pulsed-mode ion clock performance • F-state trapping • Current focus: microwave optical double resonance continuous operation • Alternative ion clock: Alkali Mediated Atomic Clock • Conclusion Miniaturization with Long-Term and Environmental Stability • Achieve Cs Beam Clock performance in a mass and power constrained package • DARPA programs: • IMPACT: improved long-term stability • ACES: improved environmental stability Applications--Excellent timing for: • Rapid GPS acquisition, and GPS denied navigation and timing • Nano/pico (cube) satellites • Pulsed radio and spread spectrum communications Microsemi 5071A Miniature primary frequency standard Approved for Public Release, Distribution Unlimited Critical Elements of the 171 Yb + Clock Trap Electrodes Ions Yb Source Vacuum Package Control and Power Electronics Local Oscillator Magnetic Shield and Coil Repump (935 nm) Optical Pumping/ State Detection Laser (369 nm) Beam Combiner Fluorescence Collection Lens Fluorescence Detector Photo Multiplier Tube (PMT) Ionization UV Light
We describe the development and frequency instability measurements of a highly miniaturized, buffer gas cooled, trapped-ion atomic clock. The clock utilizes the 12.6 GHz hyperfine transition of the171Yb+ion. A custom-built 3 cm3vacuum package containing the ion trap is integrated with other key elements of the atomic frequency standard, including a photo multiplier tube, miniaturized laser sources at 369 nm and 935 nm, a local oscillator, and control electronics. With the clock physics package assembled on a 10 cm × 15 cm breadboard, the long-term fractional frequency instability was measured to be 6 × 10-14at 25 days of integration. Later, the clock physics package was further miniaturized, and the frequency instability was measured to be 2 × 10-11/τ1/2at integration times up to 10,000 s.
We report a demonstration of a very small microwave atomic clock using the 12.6 GHz hyperfine transition of the trapped 171Yb ions inside a miniature, completely sealed-off 3 cm3 ion-trap vacuum package. In the ion clock system, all of the components are highly miniaturized with low power consumption except the 369 nm optical pumping laser still under development for miniaturization. The entire clock, including the control electronics, consumes <300 mW. The fractional frequency instability of the miniature Yb+ clock reaches the 10−14 range after a few days of integration.