Quantum

From spectroscopy to quantum dynamics: assessing reduced models of a NaCs molecular gate

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 09/11/2026, 05:13:25 UTC.

Briefings

A study on NaCs molecular gates found that small optical polarization shifts drastically reduced gate fidelity, while carrier retuning could recover most errors. The research used a 128-state Hamiltonian restricted to N=0,1 rotational states, fitting parameters to three microwave transitions. Key results showed fidelity dropped from 94.64% to 1.09% with polarization changes, but recovered to 89.31% after retuning. The study also noted nonmonotonic fidelity changes with basis enlargement and highlighted that isolated transfer controls showed fidelities differing by over 11 percentage points.

Key points

• A 128-state molecular Hamiltonian restricted to the N=0,1 rotational manifold was used to model a dipolar-exchange gate between two optically trapped 23Na133Cs molecules.
• Changing the optical polarization angle by +0.1 degrees reduced calculated gate fidelity from 94.64% to 1.09% at fixed carrier frequencies, while retuning carriers restored fidelity to 89.31%.

Context

This research investigates how spectroscopic calibration and basis selection impact predictions for a dipolar-exchange gate between two optically trapped NaCs molecules, providing a bound on the error of a projected propagator.

Limitations

The study relies on numerical tests and limited microwave transition data; specific city locations or publisher details are not provided in the source evidence.

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