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

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 $\mu$s 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.

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Cited by in corpus (11)

• Many-Body Physics with Individually-Controlled Rydberg Atoms
• Analyzing the Rydberg-based omg architecture for ${}^{171}$Yb nuclear spins
• Preparation of one ${}^{87}$Rb and one ${}^{133}$Cs atom in a single optical tweezer
• High-Fidelity, Low-Loss State Detection of Alkali-Metal Atoms in Optical Tweezer Traps
• Off-axis dipole forces in optical tweezers by an optical analog of the {Magnus} effect
• Optical pumping of ${5s4d}^1{\mathrm{D}}_2$ strontium atoms for laser cooling and imaging
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers
• Microscope objective for imaging atomic strontium with 0.63 micrometer resolution
• Number-State Reconstruction with a Single Single-Photon Avalanche Detector
• Absolute frequency measurements on the $5s5p^3$P${}_0\to 5s6d^3$D${}_1$ transition in strontium
• Differential polarizability at 1064 nm of the strontium intercombination transition