Atom-to-molecule conversion efficiency and adiabatic fidelity

TL;DR

This paper investigates the efficiency of atom-to-molecule conversion in fermionic gases, highlighting the superiority of STIRAP with Feshbach resonance for lithium-6 and analyzing adiabatic fidelity to explain differences in conversion efficiency.

Contribution

It introduces a natural definition of adiabatic fidelity for CPT states and compares the effectiveness of STIRAP versus Feshbach resonance in different atomic species.

Findings

STIRAP with Feshbach resonance is more effective for $^6$Li than for $^{40}$K.

A new definition of adiabatic fidelity for CPT states is proposed.

Differences in conversion efficiencies are explained through fidelity analysis.

Abstract

The efficiency of converting two-species fermionic atoms into bosonic molecules is investigated in terms of mean-field Lagrangian density. We find that the STIRAP technique aided by Feshbach resonance is more effective than the bare Fechbach resonance for $^6$Li atoms rather than $^{40}$K atoms. We also make general consideration on the symmetry and its relevant conservation law, which enable us to introduce a natural definition of adiabatic fidelity for CPT state. The calculated values of the fidelity then provide an interpretation on why the conversion efficiencies for $^{40}$K and $^6$Li are distinctly different.