Hybrid entanglement between optical discrete polarizations and continuous quadrature variables

TL;DR

This paper proposes a new scheme for generating hybrid entanglement between discrete polarization and continuous quadrature optical qubits, enabling advanced quantum communication protocols.

Contribution

It introduces a novel method for remote hybrid entanglement generation using Bell state measurement, advancing quantum network capabilities.

Findings

Successful scheme for remote hybrid entanglement generation

Application to entanglement swapping and quantum teleportation

Potential for heterogeneous quantum networks

Abstract

By coherently combining advantages while largely avoiding limitations of two mainstream platforms, optical hybrid entanglement involving both discrete and continuous variables has recently garnered widespread attention and emerged as a promising idea for building heterogenous quantum networks. Different from previous results, here we propose a new scheme to remotely generate hybrid entanglement between discrete-polarization and continuous-quadrature optical qubits heralded by two-photon Bell state measurement. As a novel nonclassical light resource, we further utilize it to discuss two examples of ways -- entanglement swapping and quantum teloportation -- in which quantum information processing and communications could make use of this hybrid technique.