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

Jackson, Niamh and Hanley, Ryan and Hill, Matthew and Leroux, Frédéric and Adams, Charles and Jones, Matthew (2020) 'Number-resolved imaging of $^{88}$Sr atoms in a long working distance optical tweezer.', SciPost physics., 8 (3). 038.


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.

Item Type:Article
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Publisher statement:Copyright N. C. Jackson et al. This work is licensed under the Creative Commons Attribution 4.0 International License.
Date accepted:07 February 2020
Date deposited:23 April 2020
Date of first online publication:10 March 2020
Date first made open access:23 April 2020

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