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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Protocol for optically pumping AlH⁺ to a pure quantum state.

Panpan Huang¹, Schuyler Kain¹, Antonio G S de Oliveira-Filho²

¹Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA. b-odom@northwestern.edu.

Physical Chemistry Chemical Physics : PCCP

|October 21, 2020

Summary

We developed an optical pumping method to prepare trapped aluminum hydride ions (AlH+) in a pure quantum state. This technique efficiently cools molecules to their ground state, achieving 95% population with an added infrared laser.

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Area of Science:

Molecular Physics
Quantum Chemistry
Laser Spectroscopy

Background:

Preparing molecules in pure quantum states is crucial for precision measurements and quantum information applications.
Trapped molecular ions like AlH+ offer a stable platform for studying fundamental physics.
Achieving population in specific hyperfine states requires sophisticated state preparation techniques.

Purpose of the Study:

To propose and simulate an optical pumping scheme for preparing trapped AlH+ molecules in a pure rovibronic ground state.
To investigate the efficiency of rotational cooling and hyperfine state preparation using tailored laser fields.
To explore the impact of an additional infrared laser on accelerating the cooling process.

Main Methods:

Utilized linearly and circularly polarized laser fields for rotational cooling and hyperfine state preparation.
Simulated population dynamics using rate equations, incorporating laser fields, blackbody radiation, and spontaneous emission.
Computed new hyperfine constants for the A2Π excited state using Restricted Advanced Self-Consistent Field (RASSCF) wavefunctions.

Main Results:

Achieved a population of 63% in the target hyperfine state after 68 μs with the proposed scheme.
Demonstrated accelerated cooling with an additional infrared laser, reaching 95% population in 25 ms.
Without the infrared laser, 95% population was reached in 1.2 s, highlighting the laser's effectiveness.

Conclusions:

The proposed optical pumping scheme effectively prepares trapped AlH+ molecules in a pure rovibronic ground state.
The inclusion of an infrared laser significantly enhances the speed of the cooling and state preparation process.
This method provides a viable route for high-fidelity state preparation of molecular ions for future applications.