Quantum discord amplification induced by quantum phase transition via a cavity-Bose-Einstein-condensate system

TL;DR

This paper proposes a theoretical scheme where quantum phase transition in a cavity-BEC system amplifies quantum discord between two atomic qubits, leveraging the system's phase transition as a sensitive control mechanism.

Contribution

It introduces a novel method to amplify quantum discord using quantum phase transition in a cavity-BEC system, linking phase transition phenomena with quantum information processing.

Findings

Quantum discord can be significantly amplified near the phase transition point.

The cavity-BEC system acts as a phase decoherence environment affecting qubits.

Quantum phase transition is identified as the key mechanism for amplification.

Abstract

We propose a theoretical scheme to realize a sensitive amplification of quantum discord (QD) between two atomic qubits via a cavity-Bose-Einstein condensate (BEC) system which was used to firstly realize the Dicke quantum phase transition (QPT) [Nature 464, 1301 (2010)]. It is shown that the influence of the cavity-BEC system upon the two qubits is equivalent to a phase decoherence environment. It is found that QPT in the cavity-BEC system is the physical mechanism of the sensitive QD amplification.