Generation of Dicke states using adiabatic passage

TL;DR

This paper demonstrates a robust method for generating entangled Dicke states in two calcium ions using adiabatic passage with frequency-chirped pulses, achieving high fidelity across various experimental conditions.

Contribution

It introduces a novel application of adiabatic passage with frequency-chirped pulses to generate Dicke states in optical qubits of ions, showing robustness and high fidelity.

Findings

Fidelities exceeding 0.5 achieved across different parameters

Robustness verified against variations in pulse width and Rabi frequency

Successful generation of entangled Dicke states in calcium ions

Abstract

Entangled states of two ions are realized by using an adiabatic process. Based on the proposal by Linington and Vitanov, we have generated Dicke states in optical qubits of two $^{40}$Ca$^+$ ions by applying frequency-chirped optical pulses with time-dependent envelopes to perform rapid adiabatic passage on sideband transitions. One of the biggest advantages of adiabatic approaches is their robustness against variations in experimental parameters, which is verified by performing experiments for different pulse widths or peak Rabi frequencies. Fidelities exceeding 0.5, which is the threshold for inseparable states, are obtained over wide ranges of parameter values.