Dynamical generation of chiral $W$ and Greenberger-Horne-Zeilinger states in laser-controlled Rydberg-atom trimers

TL;DR

This paper proposes a method to generate chiral W and GHZ states in a three-atom Rydberg system using laser control, enabling efficient state conversion with practical timescales.

Contribution

It introduces a novel approach for engineering chiral W states and converting them into GHZ states in Rydberg-atom trimers, expanding quantum state control capabilities.

Findings

Chiral W states can be realized through specific laser and atomic configurations.

Twisted W states can be deterministically converted into GHZ states.

State conversion times are much shorter than Rydberg state lifetimes.

Abstract

Motivated by the significantly improved scalability of optically-trapped neutral-atom systems, extensive efforts have been devoted in recent years to quantum-state engineering in Rydberg-atom ensembles. Here we investigate the problem of engineering generalized (``twisted'') $W$ states, as well as Greenberger-Horne-Zeilinger (GHZ) states, in the strongly-interacting regime of a neutral-atom system. We assume that each atom in the envisioned system initially resides in its ground state and is subject to several external laser pulses that are close to being resonant with the same internal atomic transition. In particular, in the special case of a three-atom system (Rydberg-atom trimer) we determine configurations of field alignments and atomic positions that enable the realization of chiral $W$ states -- a special type of twisted three-qubit $W$ states of interest for implementing noiseless-subsystem qubit encoding. Using chiral W states as an example we also address the problem of deterministically converting twisted $W$ states into their GHZ counterparts in the same three-atom system, thus significantly generalizing recent works that involve only ordinary $W$ states. We show that starting from twisted -- rather than ordinary -- $W$ states is equivalent to renormalizing downwards the relevant Rabi frequencies. While this leads to somewhat longer state-conversion times, we also demonstrate that those times are at least two orders of magnitude shorter than typical lifetimes of relevant Rydberg states.