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Related Experiment Video

Updated: Feb 13, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Parity-doublet coherence times in optically trapped polyatomic molecules.

Paige Robichaud^1,2, Christian Hallas^3,4, Junheng Tao^3,4

¹Department of Physics, Harvard University, Cambridge, MA, USA. paigerobichaud@g.harvard.edu.

|February 11, 2026

Summary

This summary is machine-generated.

Researchers achieved a record coherence time of 0.8 seconds in optically trapped CaOH molecules. This breakthrough utilizes parity-doublet states in polyatomic molecules for advanced quantum science applications.

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Area of Science:

Quantum information science
Quantum simulation
Precision searches for new physics

Background:

Polyatomic molecules possess complex internal structures suitable for quantum applications.
Parity-doublet states, arising from molecular degrees of freedom, are key for quantum science.
Linear triatomic molecules feature ℓ-type parity-doublet states in vibrational modes with predicted coherence.

Purpose of the Study:

To prepare and study CaOH molecules in ℓ-type parity-doublet states.
To achieve and measure qubit coherence times in these molecular states.
To investigate factors limiting coherence, such as Stark shifts and trap effects.

Main Methods:

Optical trapping of CaOH molecules.
Preparation of molecules in ℓ-type parity-doublet states.
Molecular spectroscopy to cancel electric fields and suppress Stark shifts.
Characterization of parity-dependent trap shifts.

Main Results:

Realization of optically trapped CaOH molecules in ℓ-type parity-doublet states.
Achieved a bare qubit coherence time of 0.8(2) seconds, exceeding the bending mode lifetime.
Identified parity-dependent trap shifts as a limiting factor for coherence.

Conclusions:

The achieved coherence times represent a significant milestone for polyatomic molecules in quantum science.
Demonstrated the potential of parity-doublet states in molecules for robust quantum applications.
Highlights the importance of controlling electric fields and trap interactions for future molecular quantum technologies.