Two Qubits Tavis-Cummings Model Beyond the Rotating Wave Approximation: Degenerate Regime

TL;DR

This paper analyzes the dynamics of two qubits interacting with a harmonic oscillator beyond the rotating wave approximation in the degenerate regime, providing exact solutions and comparing quantum and classical oscillator treatments.

Contribution

It offers exact analytic expressions for qubit entanglement and explores differences between quantum and classical oscillator dynamics in the degenerate regime.

Findings

Exact expressions for qubit entanglement derived.

Qualitative differences identified between quantum and classical oscillator treatments.

Insights into the dynamics beyond the rotating wave approximation in the degenerate regime.

Abstract

We study the dynamics of two qubits interacting with a single mode of a harmonic oscillator beyond the rotating wave approximation in the ideally degenerate regime. Exact analytic expressions are obtained for state properties of interest, including qubit entanglement for a certain class of initial states of the oscillator and the qubits. Qualitative differences and similarities in the evolution of the qubits in the degenerate regime when the oscillator is treated quantum mechanically and classically are discussed.