Hybrid-Entanglement in Continuous Variable Systems

TL;DR

This paper demonstrates the generation of hybrid-entangled states in continuous variable systems by exploiting squeezed cylindrically polarized optical modes, entangling spatial and polarization degrees of freedom through experimental quantum squeezing.

Contribution

It introduces a novel method to create hybrid-entangled states in continuous variables using cylindrically polarized modes and experimental quantum squeezing.

Findings

Successful experimental realization of hybrid-entangled states

Entanglement between spatial and polarization degrees of freedom

Use of tailored photonic crystal fiber for squeezing

Abstract

Entanglement is one of the most fascinating features arising from quantum-mechanics and of great importance for quantum information science. Of particular interest are so-called hybrid-entangled states which have the intriguing property that they contain entanglement between different degrees of freedom (DOFs). However, most of the current continuous variable systems only exploit one DOF and therefore do not involve such highly complex states. We break this barrier and demonstrate that one can exploit squeezed cylindrically polarized optical modes to generate continuous variable states exhibiting entanglement between the spatial and polarization DOF. We show an experimental realization of these novel kind of states by quantum squeezing an azimuthally polarized mode with the help of a specially tailored photonic crystal fiber.