Optical logic gates using coherent feedback

We experimentally demonstrate optical logic “or” and “nor” gates via coherent feedback. Based on a four-wave mixing process in hot rubidium vapor, two feedback beams are capable of fulfilling an optical “nor” gate for the feedback-suppressed state and an optical “or” gate for the feedback-boosted st...

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Bibliographic Details
Published in:Applied physics letters 2012-11, Vol.101 (19)
Main Authors: Zhou, Zhifan, Liu, Cunjin, Fang, Yami, Zhou, Jun, Glasser, Ryan T., Chen, Liqing, Jing, Jietai, Zhang, Weiping
Format: Article
Language:English
Subjects:
Beams (radiation)
Coherence
Conversion
Feedback
Four-wave mixing
Gates
Logic
Rubidium
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Summary:We experimentally demonstrate optical logic “or” and “nor” gates via coherent feedback. Based on a four-wave mixing process in hot rubidium vapor, two feedback beams are capable of fulfilling an optical “nor” gate for the feedback-suppressed state and an optical “or” gate for the feedback-boosted state simultaneously. The logic gates exhibit transition times faster than previously demonstrated in rubidium vapor. Coherent photon conversion between the two logic states, due to the atomic coherence, is observed in the coherent feedback process.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4767133