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Subnatural Linewidth Biphotons with Controllable Temporal Length

2008; American Physical Society; Volume: 100; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.100.183603

1092-0145

Shengwang Du, Pavel Kolchin, Chinmay Belthangady, G. Y. Yin, S. E. Harris,

Mechanical and Optical Resonators

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.