Correlating two qubits via common cavity environment

TL;DR

This paper investigates how two qubits become entangled through a shared cavity environment, highlighting the importance of coupling strength and resonance conditions in achieving maximal entanglement.

Contribution

It demonstrates the critical role of coupling ratios and resonance in entanglement generation within a cavity-QED setup, including threshold and non-monotonic behaviors.

Findings

Off-resonant coupling ratio threshold for maximal entanglement

Maximum entanglement at intermediate coupling in resonance

Steady-state entanglement depends non-trivially on drive strength

Abstract

Generation of quantum entanglement between a pair of qubits is studied in a cavity-QED platform. The qubit pair is placed inside a common cavity environment. We show that the relative strength of qubit-photon couplings is crucial for establishing inter-qubit entanglement. Resonance as well as off-resonance between the qubits and photon are considered . For off-resonant case we detect a threshold value of coupling ratio, beyond which maximally entangled state is always available. The resonant case displays interesting non-monotonic behavior, where the maximum entanglement peaks at an intermediate coupling ratio. The driven-dissipative dynamics of our model exhibits non-trivial dependence of steady-state entanglement on the drive strength.