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Generation of Narrow Bandwidth Paired Photons: Use of A Single Driving Laser

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

Published Jan 1, 2006• 0 citations
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We describe a generator of narrow-band paired photons. A single retroreflected Ti:sapphire laser is used to cool, render transparent, and parametrically pump a cloud of (87)Rb atoms. We attain a paired-photon generation rate into opposing fibers of 600 counts/s with an intensity correlation function that has a width of 5 ns, and violates the Cauchy-Schwartz criteria by a factor of 2000.

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Generation of Narrow Bandwidth Paired Photons: Use of a single driving laser

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text S. Du, P. Kolchin, C. Belthangady, G. Y. Yin, and S. E. Harris, "Generation of Narrow Bandwidth Paired Photons: Use of a single driving laser," in Slow and Fast Light, Technical Digest (CD) (Optica Publishing Group, 2006), paper TuA2. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Slow and Fast Light (SL)•Jan 1, 2006•5 citations

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Generation of subnatural-linewidth orbital angular momentum entangled biphotons using a single driving laser in hot atoms

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Orbital angular momentum (OAM) entangled photon pairs with narrow bandwidths play a crucial role in the interaction of light and quantum states of matter. In this article, we demonstrate an approach for generating OAM entangled photon pairs with a narrow bandwidth by using a single driving beam in a 85 Rb atomic vapor cell. This single driving beam is able to simultaneously couple two atomic transitions and directly generate OAM entangled biphotons by leveraging the OAM conservation law through the spontaneous four-wave mixing (SFWM) process. The photon pairs exhibit a maximum cross-correlation function value of 27.7 and a linewidth of 4 MHz. The OAM entanglement is confirmed through quantum state tomography, revealing a fidelity of 95.7% and a concurrence of 0.926 when compared to the maximally entangled state. Our scheme is notably simpler than previously proposed schemes and represents the first demonstration of generating subnatural-linewidth entangled photon pairs in hot atomic systems.

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Generation and Application of Narrow-Band Photon Pairs (Invited)

Shengwang Du

•Jan 1, 2013•0 citations
Orbital angular momentum (OAM) entangled photon pairs with narrow bandwidths play a crucial role in the interaction of light and quantum states of matter. In this article, we demonstrate an approach for generating OAM entangled photon pairs with a narrow bandwidth by using a single driving beam in a 85 Rb atomic vapor cell. This single driving beam is able to simultaneously couple two atomic transitions and directly generate OAM entangled biphotons by leveraging the OAM conservation law through the spontaneous four-wave mixing (SFWM) process. The photon pairs exhibit a maximum cross-correlation function value of 27.7 and a linewidth of 4 MHz. The OAM entanglement is confirmed through quantum state tomography, revealing a fidelity of 95.7% and a concurrence of 0.926 when compared to the maximally entangled state. Our scheme is notably simpler than previously proposed schemes and represents the first demonstration of generating subnatural-linewidth entangled photon pairs in hot atomic systems.