Poster Session

Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 // Session D00

Topics:

Towards a quantum-logic ion clock based on Ba⁴⁺

Poster 150

Presenter: Jacob B VanArsdale (Colorado State University)

Authors: Aung Naing (Colorado State University), Haoran Ding (Colorado State University), Alessandro Banducci (Colorado State University), David Fairbank (Colorado State University), Samuel Brewer (Colorado State University)

Highly charged ions (HCIs) greatly expand the collection of viable atomic species that can be used to build high-accuracy optical clocks. Recently, ¹³⁸Ba⁴⁺ has been identified as a potential high-accuracy optical clock candidate, with a laser accessible ³P₂ - ³P₀ electric quadrupole transition at 338.8 THz¹. We present progress towards the development of an optical atomic clock based on Ba⁴⁺. The clock will employ a single Ca⁺ ion for sympathetic cooling and quantum-logic readout operations². We also discuss the development of a compact electron beam ion source (EBIS) optimized to generate Ba⁴⁺ ions, along with the initial design of an ion optics beamline used to extract and transfer Ba⁴⁺ ions to a radiofrequency Paul trap for clock operation. As a preliminary milestone, we have demonstrated sideband cooling as well as optical clock operation on the 729 nm ²S_1/2 - ²D_5/2 clock transition in ⁴⁰Ca⁺.

[1] K. Beloy, V. A. Dzuba, and S. M. Brewer, Phys. Rev. Lett. 125, 173002 (2020).

[2] P. O. Schmidt, T. Rosenband, C. Langer, W. M. Itano, J. C. Bergquist, and D. J. Wineland, Science. 309, 749-52 (2005).

Funding acknowledgement

This work was supported by National Science Foundation Grant No. PHY-2110102, Office of Naval Research Grant No. N00014-22-1-2070, and NIST Precision Measurement Grant No. 70NANB22H218.

POSTERS (157)

Poster Session I (4pm-6pm CDT)

Towards a quantum-logic ion clock based on Ba4+

Funding acknowledgement

Towards a quantum-logic ion clock based on Ba⁴⁺