Entangled Quantum Nonlinear Schroumldinger Solitons

Abstract

Considered as a multipartite quantum system, time-multiplexed nonlinear Schroumldinger solitons after collision are rigorously proved to become quantum entangled in the sense that their quadrature components of suitably selected internal modes satisfy the inseparability criterion. Clear physical insights for the origin of entanglement are given, and the required homodyne local oscillator pulse shape for optimum entanglement detection is determined.