Feedback-optimized Extraordinary Optical Transmission of Continuous-variable Entangled States

TL;DR

This paper demonstrates a feedback-controlled method to enhance the transmission of continuous-variable entangled states through a metal-hole array, improving quantum correlations and addressing losses in plasmonic quantum circuits.

Contribution

It introduces a feedback optimization technique that significantly boosts quantum correlations in plasmonic structures for quantum information applications.

Findings

Quantum entanglement survives photon-plasmon-photon conversion.

Feedback control enhances quantum correlations compared to no feedback.

Technique helps recover losses in plasmonic quantum circuits.

Abstract

We report on the feedback-optimized extraordinary optical transmission of continuous-variable entangled states through a hexagonal metal-hole array. The continuous-variable entanglements from a nondegenerate optical parametric amplifier are first demonstrated to survive after a photon-plasmon-photon conversion process. By controlling the reflected light from the metal-hole array, a significant enhancement of quantum correlations has then been experimentally achieved comparing to the case of without such coherent feedback control. This result presents a useful technique to efficiently recover the substantial reflective losses in the plasmonic circuits for quantum information processing.