The Multiparty Coherent Channel and its Implementation with Linear Optics

TL;DR

This paper extends the continuous-variable coherent channel to multiparty scenarios and proposes two linear optics-based methods for implementation, enabling advanced multiparty quantum communication protocols.

Contribution

It introduces definitions for multiparty conat channels and provides two practical linear optics methods for their implementation.

Findings

Defined multiparty position- and momentum-quadrature conat channels

Proposed two implementation methods using linear optics

Enabled multiparty coherent communication protocols

Abstract

The continuous-variable coherent (conat) channel is a useful resource for coherent communication, producing coherent teleportation and coherent superdense coding. We extend the conat channel to multiparty conditions by proposing definitions about multiparty position-quadrature conat channel and multiparty momentum-quadrature conat channel. We additionally provide two methods to implement this channel using linear optics. One method is the multiparty version of coherent communication assisted by entanglement and classical communication (CCAECC). The other is multiparty coherent superdense coding.