Generation of Competitive and Coexisting Two Pairs of Biphotons in Single Hot Atomic Vapor Cell,Annalen Der Physik

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Generation of Competitive and Coexisting Two Pairs of Biphotons in Single Hot Atomic Vapor Cell
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-07-08 , DOI: 10.1002/andp.202000283
Kangkang Li ₁ , Yuan Feng ₁ , Xinghua Li ₁ , Bingling Gu ₁ , Yin Cai ₁ , Yanpeng Zhang ₁

Affiliation

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.

中文翻译：

在单个热原子蒸气细胞中产生竞争性并存的两对双光子

光的非经典状态可以作为新兴的量子信息过程的潜在候选者。增强其可扩展性的一种处理趋势是将具有修饰状态图片的多个非线性过程集成到单个设备中，因此对于量子计算很有用。在这里，提出了一种新颖的方法，通过一个热hot蒸气池中的两个四波混合过程，通过实验实现共存两对窄带双光子的产生。基于光子-原子非线性界面，生成的双光子在时间能量上表现出真正的纠缠。同时，具有修正状态图像的非线性磁化率将双光子波包的时间相关性决定为阻尼周期性拉比振荡，暗示了高维时间-能量纠缠态的性质。这种高维纠缠态也是增强信息承载能力的有效途径。通过分别在单个器件中交替改变两个非线性磁化率，在这两对双光子之间存在着发电速率的竞争。而且，两者都产生了两对双光子，它们违反了柯西-施瓦兹不等式，并表现出它们的非经典行为。

更新日期：2020-07-08

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