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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Generation of modal- and path-entangled photons using a domain-engineered integrated opticalwaveguide device
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Generation of modal- and path-entangled photons using a domain-engineered integrated opticalwaveguide device

机译：使用域工程集成光波导器件生成模态和路径纠缠的光子

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Integrated optical devices are expected to play a promising role in the field of quantum information science and technology. In this paper we propose a scheme for the generation of nondegenerate, copolarized, modal, and path-entangled photons using a directional coupler and an asymmetric Y-coupler geometry in type-0 phase-matched domain-engineered lithium niobate (LN) waveguide. The nonlinearity in LN is tailored in such a way that quasi-phase-matching conditions for two different spontaneous parametric down-conversion processes are obeyed simultaneously, leading to a modal and path-entangled state at the output. Assuming typical values of various parameters, we show, through numerical simulations, that an almost maximally entangled state is achievable over a wide range of waveguide parameters. For the degenerate case, the proposed scheme gives a NOON state for N = 2. The generated entangled photon pairs should have potential applications in quantum information schemes and also in quantum metrology. By appropriate domain engineering and component designing, the idea can be further extended to generate hyperentangled and two-photon multipath-entangled states, which may have further applications in quantum computation protocols.
机译：集成光学器件有望在量子信息科学和技术领域中发挥有前途的作用。在本文中，我们提出了一种使用定向耦合器和非对称Y耦合器几何结构在0型相匹配域工程铌酸锂（LN）波导中生成非简并，同极化，模态和路径纠缠光子的方案。 LN中的非线性是通过定制的方式来实现的，使得同时遵守两个不同的自发参数下变频过程的准相位匹配条件，从而在输出端产生模态和路径纠缠状态。假设各种参数的典型值，我们通过数值模拟表明，在宽范围的波导参数上几乎可以实现最大纠缠状态。对于简并的情况，所提出的方案给出了N = 2的NOON状态。生成的纠缠光子对在量子信息方案以及量子计量学中应具有潜在的应用。通过适当的领域工程和组件设计，可以进一步扩展该思想以生成超纠缠和双光子多径纠缠态，这可能在量子计算协议中有进一步的应用。

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