Generation of Competitive and Coexisting Two Pairs of Biphotons in Single Hot Atomic Vapor Cell |
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Authors: | Kangkang Li Yuan Feng Xinghua Li Bingling Gu Yin Cai Yanpeng Zhang |
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Institution: | Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an, 710049 China |
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Abstract: | The non-classical states of light serve as a potential candidate for emerging quantum information process. A processing trend to enhance its scalability is to integrate multiple nonlinear processes with the dressed-state picture into a single device, and therefore, are useful for quantum computations. Here, a novel method is proposed to experimentally achieve the generation of coexisting two pairs of narrow-band biphotons by two four-wave mixing processes in a single hot rubidium vapor cell. Based on the photon-atom nonlinear interfaces, the generated biphotons exhibits genuine entanglement in time–energy. Meanwhile, the nonlinear susceptibility with the dressed-state picture decides the temporal correlation of the biphotons wave packet as a damped periodic Rabi oscillation, suggesting the property of the high-dimensional time–energy entangled state. Such a high-dimensional entangled state also is an efficient way to enhance information carrying capacity. By alternating two nonlinear susceptibilities in a single device, respectively, there exists a competition of the generation rate between such two pairs of biphotons. Moreover, both generated two pairs of biphotons that violate the Cauchy–Schwarz inequality and show their non-classical behavior. |
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Keywords: | biphotons dressed state nonlinear optics |
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