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Conference on Lasers and Electro-Optics

Photon Logic Gates Using Ultraslow Light

Byoung Seung HAM, Joonsung Hahn

Published Jan 1, 2009• 1 citation
Publisher

Abstract

Photon logic gates are observed using ultraslow light. The building block of the photon logic gate is photon routing phenomenon, where the routing is based on atomic coherence enhanced by ultraslow light.
DOI
10.1364/cleo.2009.jtue2

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 7, 2009•0 citations
We report observations of photon logic gate operations using ultraslow light phenomena in a rare-earth doped solid medium. Unlike conventional optical logic gates based on semiconductor optical amplifiers, the present photon logic gate utilizes spin coherence, which is completely free from the optical population constraint and gives potential for ultrahigh speed operations. In addition to the possibility of ultralow power operations, the usage of ultraslow light gives a benefit of all-optical buffer memory functions. Thus, the present demonstration has potential applications to cascadable photon logic devices.
Photons are a promising candidate for quantum bits because their interaction with the environment is so weak that the quantum superposition state can easily be maintained. However, the construction of a quantum gate that controls one photon with another photon is a major challenge because of the difficulty of achieving photon-photon interaction. We show the realization of the quantum gates or devices which rely on quantum nonlinearity for photons induced with only linear optics. We also show that a quantum device using the induced nonlinearity is useful to verify quantum physics.
Photon Logic gates based on quantum coherence have been presented for Boolean logic operations of NAND. The present photon logic gates use quantum coherence in a three-level system interacting with resonant Raman optical fields. In a specific condition of ultraslow light, the quantum coherence can be greatly enhanced so that ultralow power light can be used for photon switching applications. Unlike conventional optical switching methods, the photon switching is free from the population relaxation constraint but relies on quantum coherence (phase relaxation). By combing two photon switches in parallel, we performed Boolean logic gate operations.