One-step generation of multi-atom Greenberger-Horne-Zeilinger states in separate cavities via adiabatic passage

TL;DR

This paper presents a robust, one-step scheme for generating multi-atom Greenberger-Horne-Zeilinger states across separated cavities using adiabatic passage, with high fidelity despite decoherence and parameter fluctuations.

Contribution

It introduces a novel one-step adiabatic passage method for deterministic GHZ state generation in spatially separated cavities, enhancing robustness and simplicity.

Findings

Scheme is insensitive to pulse parameter fluctuations

High fidelity achieved despite cavity decay and atomic spontaneous emission

Numerical simulations confirm robustness against decoherence

Abstract

We propose a scheme to deterministically generate Greenberger-Horne-Zeilinger states of $N\geq 3$ atoms trapped in spatially separated cavities connected by optical fibers. The scheme is based on the technique of fractional stimulated Raman adiabatic passage which is one-step in the sense that one needs just wait for the desired entangled state to be generated in the stationary regime. The parametrized shapes of the Rabi frequencies of the classical fields that drive the two end atoms are chosen appropriately to realize the scheme. We also show numerically that the proposed scheme is insensitive to the fluctuations of the pulses' parameters and, at the same time, robust against decoherence caused by the dissipation due to fiber decay. Moreover, a relatively high fidelity can be obtained even in the presence of cavity decay and atomic spontaneous emission.