Observing different phases for the dynamics of entanglement in an ion trap

TL;DR

This paper explores the complex entanglement dynamics of two ions in a trap interacting with a thermal environment, identifying different long-term behaviors and proposing an experimental setup to observe these phenomena.

Contribution

It introduces a novel ion trap experiment to simulate and observe multiple entanglement phases in a non-Markovian open quantum system.

Findings

Identification of three distinct entanglement phases

Proposal of an experimental scheme using ion traps

Control over entanglement dynamics in a non-Markovian regime

Abstract

The evolution of the entanglement between two oscillators coupled to a common thermal environment is non-trivial. The long time limit has three qualitatively different behaviors (phases) depending on parameters such as the temperature of the bath ({\em Phys. Rev. Lett.} \textbf{100}, 220401). The phases include cases with non-vanishing long-term entanglement, others with a final disentangled state, and situations displaying an infinite sequence of events of disappearance and revival of entanglement. We describe an experiment to realize these different scenarios in an ion trap. The motional degrees of freedom of two ions are used to simulate the system while the coupling to an extra (central) ion, which is continuously laser cooled, is the gateway to a decohering reservoir. The scheme proposed allows for the observation and control of motional entanglement dynamics, and is an example of a class of simulations of quantum open systems in the non-Markovian regime.