Entanglement dynamics of quantum states in a beam splitter

TL;DR

This paper investigates how entangled quantum states evolve when passing through a beam splitter with a Kerr medium, revealing revival phenomena, increased entanglement with nonclassicality, and robustness against decoherence.

Contribution

It introduces a theoretical analysis of entanglement dynamics in a beam splitter with a Kerr medium, highlighting revival phenomena and robustness of nonclassical states.

Findings

Revival and fractional revival phenomena are observed in entangled states.

Maximum entanglement correlates with wave packet collapses in the Kerr medium.

Nonclassical initial states produce more decoherence-resistant entangled states.

Abstract

We theoretically study the dynamics of entangled states created in a beam splitter with a nonlinear Kerr medium placed into one input arm. Entanglement dynamics of initial classical and nonclassical states are studied and compared. Signatures of revival and fractional revival phenomena exhibited during the time evolution of states in the Kerr medium are captured in the entangled states produced by the beam splitter. Maximum entanglement is obtained at the instants of collapses of wave packets in the medium. Our analysis shows increase in entanglement with increase in the degree of nonclassicality of the initial states considered. We show that the states generated at the output of the beam splitter using initial nonclassical states are more robust against decoherence, due to photon absorption by an environment, than those formed by an initial classical state.