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We report on the feedback-optimized extraordinary optical transmission ofcontinuous-variable entangled states through a hexagonal metal-hole array. Thecontinuous-variable entanglements from a nondegenerate optical parametricamplifier are first demonstrated to survive after a photon-plasmon-photonconversion process. By controlling the reflected light from the metal-holearray, a significant enhancement of quantum correlations has then beenexperimentally achieved comparing to the case of without such coherent feedbackcontrol. This result presents a useful technique to efficiently recover thesubstantial reflective losses in the plasmonic circuits for quantum informationprocessing.

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