Continuous-variable dense coding by optomechanical cavities

TL;DR

This paper demonstrates how optomechanical cavities with a membrane-in-the-middle setup can generate entangled light suitable for continuous-variable dense coding, surpassing classical channel capacities at low photon numbers.

Contribution

It introduces a novel optomechanical protocol for dense coding using entangled light from a membrane-in-the-middle cavity, achieving near-capacity entanglement at low photon levels.

Findings

Mechanical resonator generates strong entanglement between optical modes.

The protocol approaches the capacity of quantum dense coding.

Outperforms classical capacity of noiseless quantum channels.

Abstract

In this paper, we show how continuous-variable dense coding can be implemented using entangled light generated from a membrane-in-the-middle geometry. The mechanical resonator is assumed to be a high reflectivity membrane hung inside a high quality factor cavity. We show that the mechanical resonator is able to generate an amount of entanglement between the optical modes at the output of the cavity, which is strong enough to approach the capacity of quantum dense coding at small photon numbers. The suboptimal rate reachable by our optomechanical protocol is high enough to outperform the classical capacity of the noiseless quantum channel.