Long-lived multilevel coherences and spin-1 dynamics encoded in the rotational states of ultracold molecules
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911110640173056 |
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| author | Hepworth, Tom R. Ruttley, Daniel K. von Gierke, Fritz Gregory, Philip D. Guttridge, Alexander Cornish, Simon L. |
| author_facet | Hepworth, Tom R. Ruttley, Daniel K. von Gierke, Fritz Gregory, Philip D. Guttridge, Alexander Cornish, Simon L. |
| contents | Rotational states of ultracold polar molecules possess long radiative lifetimes, microwave-domain coupling, and tunable dipolar interactions. The availability of numerous rotational states has inspired many proposed applications, including simulations of quantum magnetism, encodings of information in high-dimensional qudits, and synthetic dimensions with many synthetic lattice sites. Many of these applications are yet to be realised, primarily because engineering long-lived coherent superpositions of multiple rotational states is highly challenging. Here, we investigate how multilevel coherences between rotational states can be engineered by using optical tweezer traps operating close to a magic wavelength for a given pair of states. By performing precision Ramsey spectroscopy we find the exact magic wavelengths and sensitivities to detuning errors for multiple rotational state superpositions. We find that, for a trap polarised parallel to the quantisation axis, the magic wavelengths are closely clustered enabling long-lived coherence across multiple rotational states simultaneously. As an example, we demonstrate simultaneous second-scale coherence between three rotational states. Utilising this extended coherence, we perform multiparameter estimation using a generalised Ramsey sequence and demonstrate coherent spin-1 dynamics encoded in the rotational states. With modest experimental improvements, we predict that second-scale coherent dynamics of ten rotational states should be readily achievable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15088 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Long-lived multilevel coherences and spin-1 dynamics encoded in the rotational states of ultracold molecules Hepworth, Tom R. Ruttley, Daniel K. von Gierke, Fritz Gregory, Philip D. Guttridge, Alexander Cornish, Simon L. Atomic Physics Quantum Gases Quantum Physics Rotational states of ultracold polar molecules possess long radiative lifetimes, microwave-domain coupling, and tunable dipolar interactions. The availability of numerous rotational states has inspired many proposed applications, including simulations of quantum magnetism, encodings of information in high-dimensional qudits, and synthetic dimensions with many synthetic lattice sites. Many of these applications are yet to be realised, primarily because engineering long-lived coherent superpositions of multiple rotational states is highly challenging. Here, we investigate how multilevel coherences between rotational states can be engineered by using optical tweezer traps operating close to a magic wavelength for a given pair of states. By performing precision Ramsey spectroscopy we find the exact magic wavelengths and sensitivities to detuning errors for multiple rotational state superpositions. We find that, for a trap polarised parallel to the quantisation axis, the magic wavelengths are closely clustered enabling long-lived coherence across multiple rotational states simultaneously. As an example, we demonstrate simultaneous second-scale coherence between three rotational states. Utilising this extended coherence, we perform multiparameter estimation using a generalised Ramsey sequence and demonstrate coherent spin-1 dynamics encoded in the rotational states. With modest experimental improvements, we predict that second-scale coherent dynamics of ten rotational states should be readily achievable. |
| title | Long-lived multilevel coherences and spin-1 dynamics encoded in the rotational states of ultracold molecules |
| topic | Atomic Physics Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2412.15088 |