Von Neumann entropy in a dispersive cavity

TL;DR

This paper investigates the von Neumann entropy of two qubits in a dispersive cavity and finds a strong correlation between entanglement entropy and spin squeezing, revealing that maximum entropy coincides with maximum spin squeezing.

Contribution

It establishes a direct relationship between von Neumann entropy and spin squeezing in a dispersive cavity system, highlighting their interconnected behavior.

Findings

Von Neumann entropy peaks at maximum spin squeezing.

Entropy is zero when spin squeezing vanishes.

Entanglement entropy closely tracks spin squeezing levels.

Abstract

We study the von Neumann entropy of the partial trace of a system of two two-level atoms (qubits) in a dispersive cavity where the atoms are interacting collectively with a single mode electromagnetic field in the cavity. We make a contrast of this entanglement entropy with the spin squeezing property of the system. We find a close relationship between this von Neumann entropy and the spin squeezing of the system. We observe that this entanglement entropy attains its maximum value when the spin squeezing in the system goes to its maximum and is zero when the spin squeezing in the system vanishes.