Subnatural linewidth biphotons with controllable temporal length.
This Letter describes the generation of biphotons with a temporal length that can be varied over the range of 50-900 ns, with an estimated subnatural linewidth as small as 0.75 MHz. We make use of electromagnetically induced transparency and slow light in a two-dimensional magneto-optical trap with an optical depth as high as 62. We report a sharp leading edge spike that is a Sommerfeld-Brillouin precursor, as observed at the biphoton level.
Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. dus@stanford.edu
Shengwang
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Du
Pavel
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Kolchin
Chinmay
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Belthangady
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Yin
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Harris