Parity-doublet coherence times in optically trapped polyatomic molecules
Nature
by Paige RobichaudFebruary 13, 2026
Polyatomic molecules provide complex internal structures that are ideal for applications in quantum information science1, quantum simulation2–4 and precision searches for physics beyond the standard model5–9. A key feature of polyatomic molecules is the presence of parity-doublet states. These structures, which generically arise from the rotational and vibrational degrees of freedom afforded by polyatomic molecules, are a powerful feature to pursue diverse quantum science applications7. Linear triatomic molecules contain ℓ-type parity-doublet states in the vibrational bending mode, which are predicted to exhibit robust coherence properties. Here we report optically trapped CaOH molecules prepared in ℓ-type parity-doublet states and realize a bare qubit coherence time of $${T}_{2}^{* }=0.8(2)\,{\rm{s}}$$ , which is longer than the 0.36 s lifetime of the bending mode10,11. We suppress differential Stark shifts by cancelling ambient electric fields using molecular spectroscopy and characterize parity-dependent trap shifts, which are found to limit the coherence time. The parity-doublet coherence times achieved in this work are a defining milestone for the use of polyatomic molecules in quantum science. Optically trapped CaOH molecules in parity-doublet states achieve coherence times exceeding vibrational lifetimes, which are a defining milestone for the use of polyatomic molecules in quantum science.
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Originally published on Nature on 2/13/2026