Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer

Jackson, Niamh; Hanley, Ryan; Hill, Matthew; Leroux, Frédéric; Adams, Charles; Jones, Matthew

Abstract

We demonstrate number-resolved detection of individual strontium atoms in a long working distance low numerical aperture (NA = 0.26) tweezer. Using a camera based on single-photon counting technology, we determine the presence of an atom in the tweezer with a fidelity of 0.989(6) (and loss of 0.13(5)) within a 200 μs imaging time. Adding continuous narrow-line Sisyphus cooling yields similar fidelity, at the expense of much longer imaging times (30 ms). Under these conditions we determine whether the tweezer contains zero, one or two atoms, with a fidelity > 0.8 in all cases with the high readout speed of the camera enabling real-time monitoring of the number of trapped atoms. Lastly we show that the fidelity can be further improved by using a pulsed cooling/imaging scheme that reduces the effect of camera dark noise.

Citation

Jackson, N., Hanley, R., Hill, M., Leroux, F., Adams, C., & Jones, M. (2020). Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer. SciPost Physics, 8(3), Article 038. https://doi.org/10.21468/scipostphys.8.3.038

• Journal Article Type: Article
• Acceptance Date: Feb 7, 2020
• Online Publication Date: Mar 10, 2020
• Publication Date: Mar 31, 2020
• Deposit Date: Apr 23, 2020
• Publicly Available Date: Apr 23, 2020
• Journal: SciPost Physics.
• Print ISSN: 2542-4653
• Electronic ISSN: 2542-4653
• Publisher: SciPost
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 3
• Article Number: 038
• DOI: https://doi.org/10.21468/scipostphys.8.3.038
• Public URL: https://durham-repository.worktribe.com/output/1272865