Maximally entangled Rydberg-atom pairs via Landau-Zener sweeps

TL;DR

This paper investigates how Landau-Zener sweeps can generate maximally entangled Rydberg atom pairs, analyzing their entanglement dynamics, phase evolution, and robustness against spontaneous emission, with implications for quantum information processing.

Contribution

It introduces a method to produce maximally entangled Rydberg pairs via Landau-Zener sweeps and examines their phase behavior and resilience to spontaneous emission.

Findings

Maximal entanglement achieved through Landau-Zener sweeps.

Entanglement oscillates periodically despite steady populations.

Oscillatory dynamics persist under spontaneous emission.

Abstract

We analyze the formation of maximally entangled Rydberg atom pairs subjected to Landau-Zener sweeps of the atom-light detuning. Though the populations reach a steady value at longer times, the phases evolve continuously, leading to periodic oscillations in the entanglement entropy. The local unitary equivalence between the obtained maximally entangled states and the Bell states is verified by computing the polynomial invariants. Finally, we study the effect of spontaneous emission from the Rydberg state of rubidium atoms on the correlation dynamics and show that the oscillatory dynamics persists for high-lying Rydberg states. Our study may offer novel ways to generate maximally entangled states, quantum gates and exotic quantum matter in arrays of Rydberg atoms through Landau Zener sweeps.