Entanglement transfer of a Rydberg W-state to a multi-mode photonic state

TL;DR

This paper presents a robust quantum protocol for efficiently transferring entanglement from a three-atom Rydberg W state to a multi-mode photonic W state using dynamic cavity mode tuning and both adiabatic and non-adiabatic methods.

Contribution

It introduces a novel entanglement transfer protocol employing cavity mode frequency adjustments and controlled transitions, with two strategies for experimental realization.

Findings

Successful entanglement transfer demonstrated with high efficiency.

Both adiabatic and non-adiabatic protocols are viable.

Proposed methods are feasible for experimental implementation.

Abstract

A robust quantum protocol has been developed that achieves highly efficient entanglement transfer from a three-atom Rydberg system, initially in a W state (|rrg>+|rgr>+|grr>)/3^0.5, to an equivalent photonic W state (|101>+|110>+|011>)/3^0.5. The entanglement transfer is achieved by dynamically adjusting the cavity mode frequencies and modulating the coupling rates, simplifying the complex transfer process into a sequence of processes involving two-level avoided crossings. We demonstrate that entanglement transfer can be achieved using either a fully adiabatic protocol or one with controlled non-adiabatic transitions at avoided crossings, generated by continuously chirping the cavity modes. Our adiabatic protocol uses the fractional STIRAP method to facilitate the partial population transfer required for generation of the photonic W state. In comparison, the non-adiabatic protocol uses non-adiabatic transitions to achieve the required partial population transfer. Furthermore, we propose two strategies for experimental implementation of our protocols.