Experimental demonstration of spinor slow light

Meng-Jung Lee, Julius Ruseckas, Chin-Yuan Lee, Viačeslav Kudriašov, Kao-Fang Chang, Hung-Wen Cho, Gediminas Juzeliānas and Ite A. Yu ()
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Meng-Jung Lee: National Tsing Hua University
Julius Ruseckas: Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12
Chin-Yuan Lee: National Tsing Hua University
Viačeslav Kudriašov: Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12
Kao-Fang Chang: National Tsing Hua University
Hung-Wen Cho: National Tsing Hua University
Gediminas Juzeliānas: Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12
Ite A. Yu: National Tsing Hua University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Slow light based on the effect of electromagnetically induced transparency is of great interest due to its applications in low-light-level nonlinear optics and quantum information manipulation. The previous experiments all dealt with the single-component slow light. Here, we report the experimental demonstration of two-component or spinor slow light using a double-tripod atom–light coupling scheme. The scheme involves three atomic ground states coupled to two excited states by six light fields. The oscillation due to the interaction between the two components was observed. On the basis of the stored light, our data showed that the double-tripod scheme behaves like the two outcomes of an interferometer enabling precision measurements of frequency detuning. We experimentally demonstrated a possible application of the double-tripod scheme as quantum memory/rotator for the two-colour qubit. Our study also suggests that the spinor slow light is a better method than a widely used scheme in the nonlinear frequency conversion.

Date: 2014
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DOI: 10.1038/ncomms6542

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