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1. An optical tweezer array of ultracold polyatomic molecules

   https://doi.org/10.1038/s41586-024-07199-1  

   Vilas, Nathaniel B; Robichaud, Paige; Hallas, Christian; Li, Grace K; Anderegg, Loïc; Doyle, John M (April 2024, Nature)

   Polyatomic molecules have rich structural features that make them uniquely suited to applications in quantum information science1–3, quantum simulation4–6, ultracold chemistry7 and searches for physics beyond the standard model8–10. However, a key challenge is fully controlling both the internal quantum state and the motional degrees of freedom of the molecules. Here we demonstrate the creation of an optical tweezer array of individual polyatomic molecules, CaOH, with quantum control of their internal quantum state. The complex quantum structure of CaOH results in a non-trivial dependence of the molecules’ behaviour on the tweezer light wavelength. We control this interaction and directly and non-destructively image individual molecules in the tweezer array with a fidelity greater than 90%. The molecules are manipulated at the single internal quantum state level, thus demonstrating coherent state control in a tweezer array. The platform demonstrated here will enable a variety of experiments using individual polyatomic molecules with arbitrary spatial arrangement. 

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2. An optical tweezer array of ultracold polyatomic molecules

   Vilas, N; Robichaud, P; Hallas, C; Li, GK; Anderegg, L; Doyle, JM (April 2024, Nature)
3. Entropy-driven order in an array of nanomagnets

   https://doi.org/10.1038/s41567-022-01555-6  

   Saglam, Hilal; Duzgun, Ayhan; Kargioti, Aikaterini; Harle, Nikhil; Zhang, Xiaoyu; Bingham, Nicholas S.; Lao, Yuyang; Gilbert, Ian; Sklenar, Joseph; Watts, Justin D.; et al (June 2022, Nature Physics)
4. An optical tweezer array of ultracold polyatomic molecules

   Vilas, N; Robichaud, P; Hallas, C; Li, GK; Anderegg, L; Doyle, JM (April 2024, Nature)
5. An optical tweezer array of ground-state polar molecules

   https://doi.org/10.1088/2058-9565/ac676c  

   Zhang, Jessie T; Picard, Lewis R; Cairncross, William B; Wang, Kenneth; Yu, Yichao; Fang, Fang; Ni, Kang-Kuen (May 2022, Quantum Science and Technology)

   Abstract Fully internal and motional state controlled and individually manipulable polar molecules are desirable for many quantum science applications leveraging the rich state space and intrinsic interactions of molecules. While prior efforts at assembling molecules from their constituent atoms individually trapped in optical tweezers achieved such a goal for exactly one molecule (Zhang J T et al 2020 Phys. Rev. Lett. 124 253401; Cairncross W B et al 2021 Phys. Rev. Lett. 126 123402; He X et al 2020 Science 370 331–5), here we extend the technique to an array of five molecules, unlocking the ability to study molecular interactions. We detail the technical challenges and solutions inherent in scaling this system up. With parallel preparation and control of multiple molecules in hand, this platform now serves as a starting point to harness the vast resources and long-range dipolar interactions of molecules. 

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