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Generation of Subnatural Linewidth Biphotons

Chinmay Belthangady, Shengwang Du, Stephen E. Harris +2 more

Jan 1, 20070 citations

Generation of subnatural-linewidth biphotons from a hot rubidium atomic vapor cell

Yanhong Xiao, Chi Shu, Lingbang Zhu +4 more

We report the generation of narrowband entangled photon pairs (biphotons) from a hot atomic vapor cell. Making use of backward spontaneous four-wave mixing with electromagnetically induced transparency (EIT), we produced subnatural-linewidth (1.9 MHz < 6 MHz) biphotons from a Doppler-broadened (0.5 GHz) hot (63 C) paraffin-coated rubidium 87 vapor cell. The biphoton coherence time is controable and can be tuned up to 100 ns by EIT. The uncorrelated photons from resonance Raman scattering are suppressed by a spatially separated and tailored optical pumping beam. The spectral brightness is as high as 14,000 s−1MHz−1. As compared with the cold-atom experiment , the hot atomic vapour cell configuration is much simpler for operation and maintenance, and it is a continuous biphoton source. Our demonstration may lead to miniature narrowband biphoton sources based on atomic vapour cells for practical quantum applications and engineering.We report the generation of narrowband entangled photon pairs (biphotons) from a hot atomic vapor cell. Making use of backward spontaneous four-wave mixing with electromagnetically induced transparency (EIT), we produced subnatural-linewidth (1.9 MHz < 6 MHz) biphotons from a Doppler-broadened (0.5 GHz) hot (63 C) paraffin-coated rubidium 87 vapor cell. The biphoton coherence time is controable and can be tuned up to 100 ns by EIT. The uncorrelated photons from resonance Raman scattering are suppressed by a spatially separated and tailored optical pumping beam. The spectral brightness is as high as 14,000 s−1MHz−1. As compared with the cold-atom experiment , the hot atomic vapour cell configuration is much simpler for operation and maintenance, and it is a continuous biphoton source. Our demonstration may lead to miniature narrowband biphoton sources based on atomic vapour cells for practical quantum applications and engineering.

Jan 1, 20170 citations

Bright narrowband biphoton generation from a hot rubidium atomic vapor cell

Lingbang Zhu, Xianxin Guo, Chi Shu +2 more

We demonstrate the generation of high-quality narrowband biphotons from a Doppler-broadened hot rubidium atomic vapor cell. Choosing a double-Λ atomic energy level scheme for optimizing both spontaneous four-wave mixing nonlinear parametric interaction and electromagnetically induced transparency (EIT), we achieve a biphoton spectral brightness as high as 14 000 s−1 MHz−1. Meanwhile, we apply a spatially tailored optical pumping beam for reduction of the Raman noise and obtain a violation of the Cauchy-Schwarz inequality by a factor of 1023.We demonstrate the generation of high-quality narrowband biphotons from a Doppler-broadened hot rubidium atomic vapor cell. Choosing a double-Λ atomic energy level scheme for optimizing both spontaneous four-wave mixing nonlinear parametric interaction and electromagnetically induced transparency (EIT), we achieve a biphoton spectral brightness as high as 14 000 s−1 MHz−1. Meanwhile, we apply a spatially tailored optical pumping beam for reduction of the Raman noise and obtain a violation of the Cauchy-Schwarz inequality by a factor of 1023.

Applied Physics LettersApr 17, 201746 citations

Optical Precursor in Hot Rubidium Vapor

Wenlong Yang, M.M. Springer, Alexandre Kolomenski +2 more

APSMar 1, 20100 citations

Enhanced spectral brightness of narrowband photon pair generation from a hot atomic vapor cell

Lingbang Zhu, Xianxin Guo, Chi Shu +2 more

We report the high-quality narrowband biphoton generation from a Doppler-broadened hot rubidium atomic vapor. Utilizing optimized energy scheme for both spontaneous four-wave mixing and electromagnetically induced transparency, we achieve a spectral brightness of 14,000 s−1MHz−1.

Nonlinear OpticsJan 1, 20170 citations

Narrow-Band Biphoton Generation near Atomic Resonance with Controllable Waverforms

Shengwang Du

Jan 1, 20100 citations

Generation of subnatural-linewdith biphotons from a hot rubidium atomic vapor cell

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