Interaction between two stopped light pulses

Yi Hsin Chen, Meng Jung Lee, Weilun Hung, Ying Cheng Chen, Yong-Fan Chen, Ite A. Yu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The efficiency of a nonlinear optical process is proportional to the interaction time. We report a scheme of all-optical switching based on two motionless light pulses via the effect of electromagnetically induced transparency. One pulse was stopped as the stationary light pulse (SLP) and the other was stopped as stored light. The time of their interaction via the medium can be prolonged and, hence, the optical nonlinearity is greatly enhanced. Using a large optical density (OD) of 190, we achieved a very long interaction time of 6.9 μs. This can be analogous to the scheme of trapping light pulses by an optical cavity with a Q factor of 8×109. With the approach of using moving light pulses in the best situation, a switch can only be activated at 2 photons per atomic absorption cross section. With the approach of employing a SLP and a stored light pulse, a switch at only 0.56 photons was achieved and the efficiency is significantly improved. Moreover, the simulation results are in good agreement with the experimental data and show that the efficiency can be further improved by increasing the OD of the medium. Our work advances the technology in quantum information manipulation utilizing photons.

Original languageEnglish
Title of host publicationFrontiers in Physics - 4th International Meeting, IMFP 2013
PublisherAmerican Institute of Physics Inc.
Number of pages10
ISBN (Print)9780735412200
Publication statusPublished - 2014 Jan 1
Event4th International Meeting on Frontiers in Physics, IMFP 2013 - Kuala Lumpur, Malaysia
Duration: 2013 Aug 272013 Aug 30

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other4th International Meeting on Frontiers in Physics, IMFP 2013
CityKuala Lumpur

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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