Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session B08: Control and Interactions in Trapped Ions
10:45 AM–12:45 PM,
Tuesday, June 4, 2024
Room: 203B
Chair: Jia Wang, Swinburne University of Technology
Abstract: B08.00001 : Progress Towards Mixed-Species, Laser-Free Quantum Logic Operation in a Surface Electrode Ion Trap
10:45 AM–10:57 AM
Presenter:
Christina M Bowers
(University of Colorado, Boulder)
Authors:
Christina M Bowers
(University of Colorado, Boulder)
Hannah M Knaack
(University of Colorado, Boulder)
Laurent J Stephenson
(National Institute of Standards and Tech)
Alejandra L Collopy
(NIST)
Andrew C Wilson
(National Institute of Standards and Technology Boulder)
Dietrich Leibfried
(National Institute of Standards and Tech)
Daniel H Slichter
(National Institute of Standards and Technology Boulder)
We present progress towards sympathetic cooling, quantum logic state preparation, and quantum logic readout operations for a 25Mg+ data ion using a co-trapped 40Ca+ helper ion in a surface electrode trap. Direct laser cooling and detection for Mg+ requires UV laser light at 280 nm, which can be complicated to generate and can cause charging of trap surfaces. Instead, we can sympathetically cool and perform indirect state-preparation and readout using laser-free quantum logic operations with the co-trapped Ca+. Once the crystal is ground state cooled, quantum logic state preparation is implemented by sideband pumping the hyperfine manifold of Mg+ to increase population in a target state, with dissipation provided by re-cooling the helper ion. Radiofrequency/microwave-based spin-motion coupling for both species enables coupling of the data and helper ion states, and thus projection of the data ion state by measuring the helper ion, without suffering from spontaneous emission. Such measurements can also be used for general data qubit readout.
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